結果
| 問題 | No.3623 2-Letter Shiritori 2 |
| コンテスト | |
| ユーザー |
 miscalc
|
| 提出日時 | 2026-08-14 21:52:36 |
| 言語 | C++23 (gcc 15.2.0 + boost 1.90.0) |
| 結果 |
AC
|
| 実行時間 | 1 ms / 2,000 ms |
| + 297µs | |
| コード長 | 65,455 bytes |
| 記録 | |
| コンパイル時間 | 2,945 ms |
| コンパイル使用メモリ | 367,692 KB |
| 実行使用メモリ | 9,316 KB |
| 最終ジャッジ日時 | 2026-08-14 21:52:46 |
| 合計ジャッジ時間 | 3,794 ms |
|
ジャッジサーバーID （参考情報） |
judge1_0 / judge3_0 |
（要ログイン）
| ファイルパターン | 結果 |
|---|---|
| other | AC * 1 |
コンパイルメッセージ
main.cpp: In lambda function:
main.cpp:2590:13: warning: '(((char*)<unknown> + 16))[768614336404564649].Edge<long long int>::to' may be used uninitialized [-Wmaybe-uninitialized]
2590 | self(self, f.to, f);
| ~~~~^~~~~~~~~~~~~~~
In lambda function,
inlined from 'EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)> [with auto:71 = EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)>]' at main.cpp:2590:13:
main.cpp:2590:13: warning: '(((char*)<unknown> + 16))[768614336404564649].Edge<long long int>::to' may be used uninitialized [-Wmaybe-uninitialized]
2590 | self(self, f.to, f);
| ~~~~^~~~~~~~~~~~~~~
In lambda function,
inlined from 'EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)> [with auto:71 = EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)>]' at main.cpp:2590:13,
inlined from 'EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)> [with auto:71 = EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)>]' at main.cpp:2590:13:
main.cpp:2590:13: warning: '(((char*)<unknown> + 16))[768614336404564649].Edge<long long int>::to' may be used uninitialized [-Wmaybe-uninitialized]
2590 | self(self, f.to, f);
| ~~~~^~~~~~~~~~~~~~~
In lambda function,
inlined from 'EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)> [with auto:71 = EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)>]' at main.cpp:2590:13,
inlined from 'EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)> [with auto:71 = EulerianTrailDirected<long long int>::run()::<lambda(auto:71, int, const Edge<long long int>&)>]' at main.cpp:2590:13,
ソースコード
#define SINGLE_TESTCASE
#ifndef LOCAL
#define FAST_IO
#endif
#define INF 4'000'000'000'000'000'037LL
#define EPS 1e-11
#include <bits/stdc++.h>
using namespace std;
#ifndef EPS
#define EPS 1e-11
#endif
using ld = decltype(EPS);
using ll = long long;
using uint = unsigned int;
using ull = unsigned long long;
using pll = pair<ll, ll>;
using tlll = tuple<ll, ll, ll>;
using tllll = tuple<ll, ll, ll, ll>;
#define vc vector
template <class T>
using vvc = vc<vc<T>>;
template <class T>
using vvvc = vc<vc<vc<T>>>;
using vb = vc<bool>;
using vl = vc<ll>;
using vpll = vc<pll>;
using vtlll = vc<tlll>;
using vtllll = vc<tllll>;
using vstr = vc<string>;
using vvb = vvc<bool>;
using vvl = vvc<ll>;
template <class T>
using pql = priority_queue<T, vc<T>, greater<T>>;
template <class T>
using pqg = priority_queue<T>;
#ifdef __SIZEOF_INT128__
using i128 = __int128_t;
using u128 = __uint128_t;
i128 stoi128(const string &s)
{
const bool neg = s.front() == '-';
u128 res = 0;
for (int i = neg; i < (int)s.size(); i++)
res = 10 * res + s[i] - '0';
if (neg)
return -i128(res - 1) - 1;
return i128(res);
}
string i128tos(i128 x)
{
if (x == 0) return "0";
string sign = "", res = "";
u128 ux;
if (x < 0)
ux = u128(-(x + 1)) + 1, sign = "-";
else
ux = x;
while (ux > 0)
{
res += '0' + ux % 10;
ux /= 10;
}
reverse(res.begin(), res.end());
return sign + res;
}
istream &operator>>(istream &is, i128 &a)
{
string s;
is >> s;
a = stoi128(s);
return is;
}
ostream &operator<<(ostream &os, const i128 &a)
{
os << i128tos(a);
return os;
}
#endif
#define cauto const auto
#define overload4(_1, _2, _3, _4, name, ...) name
#define rep1(i, n) for (ll i = 0, nnnnn = ll(n); i < nnnnn; i++)
#define rep2(i, l, r) for (ll i = ll(l), rrrrr = ll(r); i < rrrrr; i++)
#define rep3(i, l, r, d) for (ll i = ll(l), rrrrr = ll(r), ddddd = ll(d); ddddd > 0 ? i < rrrrr : i > rrrrr; i += d)
#define rep(...) overload4(__VA_ARGS__, rep3, rep2, rep1)(__VA_ARGS__)
#define repi1(i, n) for (int i = 0, nnnnn = int(n); i < nnnnn; i++)
#define repi2(i, l, r) for (int i = int(l), rrrrr = int(r); i < rrrrr; i++)
#define repi3(i, l, r, d) for (int i = int(l), rrrrr = int(r), ddddd = int(d); ddddd > 0 ? i < rrrrr : i > rrrrr; i += d)
#define repi(...) overload4(__VA_ARGS__, repi3, repi2, repi1)(__VA_ARGS__)
#define fe(...) for (auto __VA_ARGS__)
#define fec(...) for (cauto &__VA_ARGS__)
#define fem(...) for (auto &__VA_ARGS__)
#ifndef INF
#define INF 4'000'000'000'000'000'037LL
#endif
#ifndef EPS
#define EPS 1e-11
#endif
template <class T>
constexpr bool is_integral_ext = is_integral_v<T> || is_same_v<T, i128> || is_same_v<T, u128>;
template <class T>
constexpr bool is_signed_ext = is_signed_v<T> || is_same_v<T, i128>;
template <class T>
constexpr bool is_unsigned_ext = is_unsigned_v<T> || is_same_v<T, u128>;
template <class T, class U>
inline bool chmin(T &a, U b) { return a > b ? a = b, true : false; }
template <class T, class U>
inline bool chmax(T &a, U b) { return a < b ? a = b, true : false; }
template <class T = ll, class U, class V, typename = enable_if_t<is_integral_ext<U> && is_integral_ext<V>>>
inline constexpr T divfloor(U a, V b) { return T(a) / T(b) - (T(a) % T(b) && (T(a) ^ T(b)) < 0); }
template <class T = ll, class U, class V, typename = enable_if_t<is_integral_ext<U> && is_integral_ext<V>>>
inline constexpr T divceil(U a, V b) { return T(a) / T(b) + (T(a) % T(b) && (T(a) ^ T(b)) >= 0); }
template <class T = ll, class U, class V, typename = enable_if_t<is_integral_ext<U> && is_integral_ext<V>>>
inline constexpr T divround(U a, V b) { return divfloor<T>(2 * T(a) + T(b), 2 * T(b)); }
template <class T = ll, class U, class V, typename = enable_if_t<is_integral_ext<U> && is_integral_ext<V>>>
inline constexpr T safemod(U a, V b) { return T(a) - T(b) * divfloor<T>(a, b); }
template <class T = ll, class U, class V>
constexpr T ipow(U a, V b)
{
assert(b >= 0);
if (b == 0)
return 1;
if (a == 0 || a == 1)
return a;
if (a < 0 && a == -1)
return b & 1 ? -1 : 1;
T res = 1, tmp = a;
while (true)
{
if (b & 1)
res *= tmp;
b >>= 1;
if (b == 0)
break;
tmp *= tmp;
}
return res;
}
template <class T = ll, class A, class B, class M>
T mul_limited(A a, B b, M m)
{
assert(a >= 0 && b >= 0 && m >= 0);
if (b == 0)
return 0;
return T(a) > T(m) / T(b) ? T(m) : T(a) * T(b);
}
template <class T = ll, class A, class B>
T mul_limited(A a, B b) { return mul_limited<T>(a, b, INF); }
template <class T = ll, class A, class B, class M>
T pow_limited(A a, B b, M m)
{
assert(a >= 0 && b >= 0 && m >= 0);
if (a <= 1 || b == 0)
return min(ipow<T>(a, b), T(m));
T res = 1, tmp = a;
while (true)
{
if (b & 1)
{
if (res > T(m) / tmp)
return m;
res *= tmp;
}
b >>= 1;
if (b == 0)
break;
if (tmp > T(m) / tmp)
return m;
tmp *= tmp;
}
return res;
}
template <class T = ll, class A, class B>
T pow_limited(A a, B b) { return pow_limited<T>(a, b, INF); }
template <class T = ll, class A, class K>
constexpr T iroot(A a, K k)
{
assert(a >= 0 && k >= 1);
if (a <= 1 || k == 1)
return a;
if (k == 2)
{
const T aa = T(a);
T x = T(sqrtl((long double)a));
while (x > aa / x)
x--;
while (x < numeric_limits<T>::max())
{
const T y = x + 1;
if (y > aa / y)
break;
x = y;
}
return x;
}
auto isok = [&](T x) -> bool
{
if (x == 0)
return true;
T res = 1, k2 = k;
while (true)
{
if (k2 & 1)
{
if (res > T(a) / x)
return false;
res *= x;
}
k2 >>= 1;
if (k2 == 0)
break;
if (x > T(a) / x)
return false;
x *= x;
}
return res <= T(a);
};
T x = pow(a, 1.0 / k);
bool up = true;
while (!isok(x))
up = false, x--;
if (up)
{
while (x < numeric_limits<T>::max() && isok(x + 1))
x++;
}
return x;
}
template <class T = ll, class A, class K>
constexpr T iroot_ceil(A a, K k)
{
T x = iroot<T>(a, k);
return ipow<T>(x, k) == a ? x : x + 1;
}
template <class D = decltype(EPS), class A>
int SGN(A a, D eps = EPS) { return int(a > eps) - int(a < -eps); }
template <class T = ll, class U, class V>
vc<T> base_repr(U val, V base)
{
assert(val >= 0);
assert(base >= 2);
if (val == 0)
return {0};
vc<T> a;
while (val > 0)
{
a.emplace_back(val % base);
val /= base;
}
reverse(a.begin(), a.end());
return a;
}
template <class T = ll, class U, class V>
vc<T> base_repr(U val, V base, int n)
{
assert(val >= 0);
assert(base >= 2);
assert(n >= 0);
vc<T> a(n);
repi(i, n)
{
a[i] = val % base;
val /= base;
}
reverse(a.begin(), a.end());
return a;
}
template <const bool use_upper = true, class U>
string base_repr_str(U val, int base)
{
assert(val >= 0);
assert(2 <= base && base <= 36);
auto a = base_repr(val, base);
string s = "";
for (cauto &ai : a)
s += (ai < 10 ? '0' + ai : (use_upper ? 'A' : 'a') + (ai - 10));
return s;
}
template <const bool use_upper = true, class U>
string base_repr_str(U val, int base, int n)
{
assert(val >= 0);
assert(2 <= base && base <= 36);
assert(n >= 0);
auto a = base_repr(val, base, n);
string s = "";
for (cauto &ai : a)
s += (ai < 10 ? '0' + ai : (use_upper ? 'A' : 'a') + (ai - 10));
return s;
}
#define ALL(a) (a).begin(), (a).end()
template <class T = ll, class V>
inline T SZ(const V &x) { return x.size(); }
#define eb emplace_back
#define LMD(x, fx) ([&](auto x) { return fx; })
template <class F>
auto gen_vec(int n, const F &f)
{
vc<decltype(f(0))> res(n);
repi(i, n) res[i] = f(i);
return res;
}
#define GEN_VEC(n, i, fi) (gen_vec(n, LMD(i, fi)))
template <class T, size_t d, size_t i = 0, class V>
auto dvec(const V (&sz)[d], const T &init)
{
if constexpr (i < d)
return vc(sz[i], dvec<T, d, i + 1>(sz, init));
else
return init;
}
template <class T = ll>
T ctol(const char &c, const string &s)
{
repi(i, SZ<int>(s)) if (s[i] == c) return i;
return -1;
}
template <class T = ll>
vc<T> stov(const string &s, char first)
{
return gen_vec(SZ<int>(s), [&](int i) -> T
{ return s[i] - first; });
}
template <class T = ll>
vc<T> stov(const string &s, const string &t)
{
return gen_vec(SZ<int>(s), [&](int i) -> T
{ return ctol(s[i], t); });
}
template <class T>
string vtos(const vc<T> &v, char first)
{
string res = "";
fe(vi : v) res += vi + first;
return res;
}
template <class T>
string vtos(const vc<T> &v, const string &t)
{
string res = "";
fe(vi : v) res += t[vi];
return res;
}
template <class T>
vc<T> concat(const vvc<T> &vs)
{
vc<T> res;
for (cauto &v : vs)
res.insert(res.end(), ALL(v));
return res;
}
template <class T>
vc<T> concat(const vc<T> &v) { return v; }
template <class T, class... Ts>
vc<T> concat(vc<T> v, const vc<Ts> &...vs)
{
(v.insert(v.end(), ALL(vs)), ...);
return v;
}
template <class T>
vc<T> merged(const vc<T> &a, const vc<T> &b)
{
vc<T> res;
merge(ALL(a), ALL(b), back_inserter(res));
return res;
}
template <class T, class I>
T vecget(const vc<T> &v, I i, const T &dflt_negative = -INF, const T &dflt_positive = INF)
{
if (i < 0)
return dflt_negative;
if (i >= SZ<int>(v))
return dflt_positive;
return v[i];
}
#ifndef INF
#define INF 4'000'000'000'000'000'037LL
#endif
template <class V>
auto SUM(const V &v)
{
typename V::value_type s{};
fec(vi : v) s += vi;
return s;
}
template <class T, class V>
T SUM(const V &v)
{
T s{};
fec(vi : v) s += vi;
return s;
}
template <class V>
auto MAX(const V &v) { return *max_element(ALL(v)); }
template <class V>
auto MIN(const V &v) { return *min_element(ALL(v)); }
template <class I = ll, class V>
I ARGMAX(const V &v) { return max_element(ALL(v)) - v.begin(); }
template <class I = ll, class V>
I ARGMIN(const V &v) { return min_element(ALL(v)) - v.begin(); }
template<class T = ll, class V>
T mex(const V &a)
{
int n = a.size();
vector<bool> exists(n, false);
repi(i, n) if (0 <= a[i] && a[i] < n) exists[a[i]] = true;
repi(x, n) if (!exists[x]) return x;
return n;
}
template <class I>
bool is_permutation(const vc<I> &p)
{
const int n = p.size();
vc<bool> b(n, false);
repi(i, n)
{
if (!(0 <= p[i] && p[i] < n))
return false;
b[p[i]] = true;
}
return all_of(ALL(b), [](bool bi)
{ return bi; });
}
template <class T = ll>
vc<T> permid(const int &n, const int &base_index = 0)
{
vc<T> p(n);
repi(i, n) p[i] = i + base_index;
return p;
}
template <class T>
vc<T> perminv(const vc<T> &p)
{
if (p.empty())
return {};
const int n = p.size();
vc<T> q(MAX(p) + 1);
repi(i, n) if (p[i] >= 0) q[p[i]] = i;
return q;
}
template <class T, class U>
vc<T> permuted(const vc<T> &a, const vc<U> &p)
{
const int n = p.size();
vc<T> res(n);
repi(i, n)
{
assert(0 <= p[i] && p[i] < U(a.size()));
res[i] = a[p[i]];
}
return res;
}
template <class T, class U, class... Ts>
vc<T> permuted(const vc<T> &p, const vc<U> &q, const vc<Ts> &...rs)
{
return permuted(permuted(p, q), rs...);
}
template <class V>
V reversed(const V &v) { return V(v.rbegin(), v.rend()); }
#if __cplusplus < 202002L
template <class V, class... Args>
V sorted(V v, Args&&... args)
{
sort(ALL(v), forward<Args>(args)...);
return v;
}
#else
template <class V, class... Args>
V sorted(V v, Args&&... args)
{
ranges::sort(v, forward<Args>(args)...);
return v;
}
#endif
template <class V, class Equal = equal_to<>>
void unique(V &v, Equal equal = {}) { v.erase(std::unique(ALL(v), equal), v.end()); }
template <class V, class Equal = equal_to<>>
V uniqued(V v, Equal equal = {}) { unique(v, equal); return v; }
template <class V, class Compare = less<>, class Equal = equal_to<>>
void sortunique(V &v, Compare comp = {}, Equal equal = {})
{
sort(ALL(v), comp);
unique(v, equal);
}
template <class V, class Compare = less<>, class Equal = equal_to<>>
V sortuniqued(V v, Compare comp = {}, Equal equal = {})
{ sortunique(v, comp, equal); return v; }
template <class V, class U>
void rotate(V &v, U k)
{
const U n = v.size();
if (n == 0)
return;
k = (k % n + n) % n;
std::rotate(v.begin(), v.begin() + k, v.end());
}
template <class V, class U>
V rotated(V v, U k) { rotate(v, k); return v; }
template <class T>
vvc<T> top(const vvc<T> &a)
{
if (a.empty())
return {};
const int n = a.size(), m = a[0].size();
vvc<T> b(m, vc<T>(n));
repi(i, n)
{
assert(SZ<int>(a[i]) == m);
repi(j, m) b[j][i] = a[i][j];
}
return b;
}
vstr top(const vstr &a)
{
vvc<char> a_(a.size());
repi(i, SZ<int>(a)) a_[i] = {ALL(a[i])};
vvc<char> b_ = top(a_);
vstr b(b_.size());
repi(i, SZ<int>(b)) b[i] = {ALL(b_[i])};
return b;
}
template <class T, class = void>
struct has_e0 : false_type {};
template <class T>
struct has_e0<T, void_t<decltype(T::e0())>> : true_type {};
template <class T>
inline constexpr bool has_e0_v = has_e0<T>::value;
template <class T>
struct MonoidAdd
{
using S = T;
static constexpr S op(S a, S b) { return a + b; }
static constexpr S e()
{
if constexpr (has_e0_v<S>)
return S::e0();
else
return {};
}
template <class I, class = decltype(declval<S>() * declval<I>())>
static constexpr S pow(const S &a, I k) { return a * k; }
};
template <class T, const T infty = INF>
struct MonoidMin
{
using S = T;
static constexpr S op(S a, S b) { return min(a, b); }
static constexpr S e() { return infty; }
template <class I>
static constexpr S pow(const S &a, I k) { return k == 0 ? e() : a; }
};
template <class T, const T infty = INF>
struct MonoidMax
{
using S = T;
static constexpr S op(S a, S b) { return max(a, b); }
static constexpr S e() { return -infty; }
template <class I>
static constexpr S pow(const S &a, I k) { return k == 0 ? e() : a; }
};
namespace internal
{
template <class M, class I, class = void>
struct HasMonoidPow : false_type
{
};
template <class M, class I>
struct HasMonoidPow<M, I, void_t<decltype(M::pow(declval<const typename M::S &>(), declval<I>()))>> : true_type
{
};
}
template <class M, class I>
typename M::S pow_monoid(typename M::S a, I k)
{
if constexpr (is_signed_ext<I>)
assert(k >= 0);
if constexpr (internal::HasMonoidPow<M, I>::value)
return M::pow(a, k);
else
{
typename M::S c = M::e();
for (; k; k >>= 1)
{
if (k & 1)
c = M::op(c, a);
a = M::op(a, a);
}
return c;
}
}
template <class G, class I>
typename G::S pow_group(typename G::S a, I k)
{
if constexpr (is_signed_ext<I>)
{
if (k < 0)
{
a = G::inv(a);
return G::op(pow_monoid<G>(a, -(k + 1)), a);
}
}
return pow_monoid<G>(a, k);
}
template <class M>
vc<typename M::S> cuml(const vc<typename M::S> &v, int left_index = 0)
{
const int n = v.size();
vc<typename M::S> res(n + 1);
res[0] = M::e();
repi(i, n) res[i + 1] = M::op(res[i], v[i]);
res.erase(res.begin(), res.begin() + left_index);
return res;
}
template <class M>
vc<typename M::S> cumr(const vc<typename M::S> &v, int right_index = 0)
{ return reversed(cuml<M>(reversed(v), right_index)); }
template <class T>
vc<T> cumlsum(const vc<T> &v, int left_index = 0)
{ return cuml<MonoidAdd<T>>(v, left_index); }
template <class T>
vc<T> cumrsum(const vc<T> &v, int right_index = 0)
{ return cumr<MonoidAdd<T>>(v, right_index); }
template <class T>
vc<T> cumlmin(const vc<T> &v, int left_index = 0)
{ return cuml<MonoidMin<T>>(v, left_index); }
template <class T>
vc<T> cumrmin(const vc<T> &v, int right_index = 0)
{ return cumr<MonoidMin<T>>(v, right_index); }
template <class T>
vc<T> cumlmax(const vc<T> &v, int left_index = 0)
{ return cuml<MonoidMax<T>>(v, left_index); }
template <class T>
vc<T> cumrmax(const vc<T> &v, int right_index = 0)
{ return cumr<MonoidMax<T>>(v, right_index); }
template <class T>
vc<T> adjd(const vc<T> &v, int left_index = 0, int right_index = 0)
{
int n = v.size();
assert(0 <= left_index && 0 <= right_index && left_index + right_index <= n + 1);
vc<T> res(n + 1);
if (n == 0)
{
res[0] = T{};
res.erase(res.end() - right_index, res.end());
res.erase(res.begin(), res.begin() + left_index);
return res;
}
res[0] = v[0];
repi(i, 1, n) res[i] = v[i] - v[i - 1];
res[n] = -v[n - 1];
res.erase(res.end() - right_index, res.end());
res.erase(res.begin(), res.begin() + left_index);
return res;
}
constexpr array<pll, 4> DRULgrid = {{{1, 0}, {0, 1}, {-1, 0}, {0, -1}}};
constexpr array<pll, 4> DRULplane = {{{0, -1}, {1, 0}, {0, 1}, {-1, 0}}};
template <class T>
struct is_random_access_iterator
{
static constexpr bool value = is_same_v<
typename iterator_traits<T>::iterator_category,
random_access_iterator_tag
>;
};
template <class T>
constexpr bool is_random_access_iterator_v = is_random_access_iterator<T>::value;
#if __cplusplus < 202002L
struct identity
{
template <class T>
constexpr T &&operator()(T &&t) const noexcept
{ return forward<T>(t); }
};
namespace internal
{
template <class T = ll, class V, class Judge>
inline T bound_helper(const V &v, Judge judge)
{
int l = -1, r = v.size();
while (r - l > 1)
{
int m = (l + r) / 2;
if (judge(m))
l = m;
else
r = m;
}
return r;
}
};
template <class T = ll, class V, class Value, class Comp = less<>, class Proj = identity>
inline T LB(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
{
return internal::bound_helper(v, [&](int i) -> bool
{ return comp(proj(*(v.begin() + i)), val); });
}
template <class T = ll, class V, class Value, class Comp = less<>, class Proj = identity>
inline T UB(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
{
return internal::bound_helper(v, [&](int i) -> bool
{ return !comp(val, proj(*(v.begin() + i))); });
}
#define DEFAULT_COMP less<>
#else
template <class T = ll, class V, class Value, class Comp = ranges::less, class Proj = identity>
inline T LB(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
{ return ranges::lower_bound(v, val, comp, proj) - v.begin(); }
template <class T = ll, class V, class Value, class Comp = ranges::less, class Proj = identity>
inline T UB(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
{ return ranges::upper_bound(v, val, comp, proj) - v.begin(); }
#define DEFAULT_COMP ranges::less
#endif
template <class T = ll, class V, class Value, class Comp = DEFAULT_COMP, class Proj = identity>
inline auto lt_max(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
-> enable_if_t<is_random_access_iterator_v<typename V::iterator>, T>
{ return LB<T>(v, val, comp, proj) - 1; }
template <class T = ll, class V, class Value, class Comp = DEFAULT_COMP, class Proj = identity>
inline auto leq_max(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
-> enable_if_t<is_random_access_iterator_v<typename V::iterator>, T>
{ return UB<T>(v, val, comp, proj) - 1; }
template <class T = ll, class V, class Value, class Comp = DEFAULT_COMP, class Proj = identity>
inline auto gt_min(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
-> enable_if_t<is_random_access_iterator_v<typename V::iterator>, T>
{ return UB<T>(v, val, comp, proj); }
template <class T = ll, class V, class Value, class Comp = DEFAULT_COMP, class Proj = identity>
inline auto geq_min(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
-> enable_if_t<is_random_access_iterator_v<typename V::iterator>, T>
{ return LB<T>(v, val, comp, proj); }
template <class T = ll, class V, class Value, class Comp = DEFAULT_COMP, class Proj = identity>
inline auto lt_cnt(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
-> enable_if_t<is_random_access_iterator_v<typename V::iterator>, T>
{ return LB<T>(v, val, comp, proj); }
template <class T = ll, class V, class Value, class Comp = DEFAULT_COMP, class Proj = identity>
inline auto leq_cnt(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
-> enable_if_t<is_random_access_iterator_v<typename V::iterator>, T>
{ return UB<T>(v, val, comp, proj); }
template <class T = ll, class V, class Value, class Comp = DEFAULT_COMP, class Proj = identity>
inline auto gt_cnt(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
-> enable_if_t<is_random_access_iterator_v<typename V::iterator>, T>
{ return SZ<T>(v) - UB<T>(v, val, comp, proj); }
template <class T = ll, class V, class Value, class Comp = DEFAULT_COMP, class Proj = identity>
inline auto geq_cnt(const V &v, const Value &val, Comp comp = {}, Proj proj = {})
-> enable_if_t<is_random_access_iterator_v<typename V::iterator>, T>
{ return SZ<T>(v) - LB<T>(v, val, comp, proj); }
template <class T = ll, class V, class L, class R, class Comp = DEFAULT_COMP, class Proj = identity>
inline auto in_cnt(const V &v, L l, R r, Comp comp = {}, Proj proj = {})
-> enable_if_t<is_random_access_iterator_v<typename V::iterator>, T>
{
if (l > r)
return 0;
return lt_cnt<T>(v, r, comp, proj) - lt_cnt<T>(v, l, comp, proj);
}
template <class V, class Value>
inline auto lt_max(const V &v, const Value &val)
-> enable_if_t<!is_random_access_iterator_v<typename V::iterator>, typename V::const_iterator>
{
auto it = v.lower_bound(val);
return it == v.begin() ? v.end() : prev(it);
}
template <class V, class Value>
inline auto leq_max(const V &v, const Value &val)
-> enable_if_t<!is_random_access_iterator_v<typename V::iterator>, typename V::const_iterator>
{
auto it = v.upper_bound(val);
return it == v.begin() ? v.end() : prev(it);
}
template <class V, class Value>
inline auto gt_min(const V &v, const Value &val)
-> enable_if_t<!is_random_access_iterator_v<typename V::iterator>, typename V::const_iterator>
{ return v.upper_bound(val); }
template <class V, class Value>
inline auto geq_min(const V &v, const Value &val)
-> enable_if_t<!is_random_access_iterator_v<typename V::iterator>, typename V::const_iterator>
{ return v.lower_bound(val); }
namespace internal
{
template <class T>
bool binsearch_adjacent(T a, T b)
{
if (a < b)
return a + 1 == b;
if (b < a)
return b + 1 == a;
return false;
}
};
template <class T = ll, class Judge, class InitOk, class InitNg>
pair<T, T> binsearch(const Judge &judge, InitOk init_ok, InitNg init_ng, bool check_ok = true, bool check_ng = true)
{
T ok(init_ok), ng(init_ng);
if (check_ok)
assert(judge(ok));
if (check_ng)
assert(!judge(ng));
while (!internal::binsearch_adjacent(ok, ng))
{
T mid = (ok & ng) + ((ok ^ ng) >> 1);
(judge(mid) ? ok : ng) = mid;
}
return {ok, ng};
}
template <class T = ld, class Judge, class InitOk, class InitNg>
T binsearch_real(const Judge &judge, InitOk init_ok, InitNg init_ng, int iteration_count = 100, bool check_ok = true, bool check_ng = true)
{
T ok(init_ok), ng(init_ng);
if (check_ok)
assert(judge(ok));
if (check_ng)
assert(!judge(ng));
repi(_, iteration_count)
{
T mid = (ok + ng) / 2;
(judge(mid) ? ok : ng) = mid;
}
return ok;
}
template <class T = ll, class Judge, class InitVal>
pair<T, T> expsearch(const Judge &judge, InitVal init_val, bool positive = true)
{
T cur(init_val), step = 1;
const bool cur_ok = judge(cur);
auto advance = [&](T x, T d, bool pos) -> T
{
if (pos)
return x > numeric_limits<T>::max() - d ? numeric_limits<T>::max() : x + d;
else
return x < numeric_limits<T>::lowest() + d ? numeric_limits<T>::lowest() : x - d;
};
T prv = advance(cur, 1, !positive);
if (prv != cur && judge(prv) != cur_ok)
{
if (cur_ok)
return {cur, prv};
else
return {prv, cur};
}
while (true)
{
T nxt = advance(cur, step, positive);
assert(nxt != cur && "the boundary must exist in the searched direction");
if (nxt == cur || judge(nxt) != cur_ok)
{
T ok = cur_ok ? cur : nxt;
T ng = cur_ok ? nxt : cur;
return binsearch<T>(judge, ok, ng, false, false);
}
cur = nxt;
if (step > numeric_limits<T>::max() / 2)
step = numeric_limits<T>::max();
else
step *= 2;
}
}
template <class T>
inline constexpr ull pow2(T k) { return 1ULL << k; }
template <class T>
inline constexpr ull MASK(T k) { return (1ULL << k) - 1ULL; }
#if __cplusplus < 202002L
inline constexpr ull bit_width(ull x) { return x == 0 ? 0 : 64 - __builtin_clzll(x); }
inline constexpr ull bit_floor(ull x) { return x == 0 ? 0ULL : 1ULL << (bit_width(x) - 1); }
inline constexpr ull bit_ceil(ull x) { return x == 0 ? 1ULL : 1ULL << bit_width(x - 1); }
inline constexpr ull countr_zero(ull x) { assert(x != 0); return __builtin_ctzll(x); }
inline constexpr ull popcount(ull x) { return __builtin_popcountll(x); }
inline constexpr bool has_single_bit(ull x) { return popcount(x) == 1; }
#else
inline constexpr ll bit_width(ll x) { return std::bit_width((ull)x); }
inline constexpr ll bit_floor(ll x) { return std::bit_floor((ull)x); }
inline constexpr ll bit_ceil(ll x) { return std::bit_ceil((ull)x); }
inline constexpr ll countr_zero(ll x) { assert(x != 0); return std::countr_zero((ull)x); }
inline constexpr ll popcount(ll x) { return std::popcount((ull)x); }
inline constexpr bool has_single_bit(ll x) { return std::has_single_bit((ull)x); }
#endif
inline constexpr ull lsb_pos(ull x) { assert(x != 0); return countr_zero(x); }
inline constexpr ull msb_pos(ull x) { assert(x != 0); return bit_width(x) - 1; }
inline constexpr ull lsb_mask(ull x) { assert(x != 0); return x & -x; }
inline constexpr ull msb_mask(ull x) { assert(x != 0); return bit_floor(x); }
inline constexpr bool btest(ull x, uint k) { return (x >> k) & 1; }
template <class T>
inline void bset(T &x, uint k, bool b = 1) { b ? x |= (1ULL << k) : x &= ~(1ULL << k); }
template <class T>
inline void bflip(T &x, uint k) { x ^= (1ULL << k); }
inline constexpr bool bsubset(ull x, ull y) { return (x & y) == x; }
inline constexpr bool bsupset(ull x, ull y) { return (x & y) == y; }
inline constexpr ull bsetminus(ull x, ull y) { return x & ~y; }
#ifdef LOCAL
#include <cpp-dump.hpp>
namespace cpp_dump::_detail
{
inline string export_var(
const i128 &x, const string &indent, size_t last_line_length,
size_t current_depth, bool fail_on_newline, const export_command &command
) {
return export_var(i128tos(x), indent, last_line_length, current_depth, fail_on_newline, command);
}
}
#define dump(...) cpp_dump(__VA_ARGS__)
namespace cp = cpp_dump;
CPP_DUMP_SET_OPTION_GLOBAL(log_label_func, cp::log_label::line());
CPP_DUMP_SET_OPTION_GLOBAL(max_iteration_count, 100);
#define local(...) __VA_ARGS__
#define oj(...)
#define local_oj(a, b) (a)
CPP_DUMP_DEFINE_EXPORT_OBJECT_GENERIC(content());
#else
#define dump(...)
#define local(...)
#define oj(...) __VA_ARGS__
#define local_oj(a, b) (b)
#endif
template <class T, class Sequence>
vc<T> content(queue<T, Sequence> que)
{
vc<T> res;
while (!que.empty())
{
res.eb(que.front());
que.pop();
}
return res;
}
template <class T, class Sequence, class Compare>
vc<T> content(priority_queue<T, Sequence, Compare> pque)
{
vc<T> res;
while (!pque.empty())
{
res.eb(pque.top());
pque.pop();
}
return res;
}
template <class T>
auto content(const T &obj) { return obj.content(); }
#if defined FAST_IO and not defined LOCAL
namespace fastio {
template <class T>
struct unsigned_integer
{
using type = make_unsigned_t<T>;
};
template <>
struct unsigned_integer<i128>
{
using type = u128;
};
template <>
struct unsigned_integer<u128>
{
using type = u128;
};
template <class T>
using unsigned_integer_t = typename unsigned_integer<T>::type;
static constexpr uint32_t SIZ = 1 << 17;
char ibuf[SIZ];
char obuf[SIZ];
char out[100];
uint32_t pil = 0, pir = 0, por = 0;
struct Pre {
char num[10000][4];
constexpr Pre() : num() {
for (int i = 0; i < 10000; i++) {
int n = i;
for (int j = 3; j >= 0; j--) {
num[i][j] = n % 10 | '0';
n /= 10;
}
}
}
} constexpr pre;
inline void load() {
memcpy(ibuf, ibuf + pil, pir - pil);
pir = pir - pil + fread(ibuf + pir - pil, 1, SIZ - pir + pil, stdin);
pil = 0;
if (pir < SIZ) ibuf[pir++] = '\n';
}
inline void flush() {
fwrite(obuf, 1, por, stdout);
por = 0;
}
void rd1(char &c) {
do {
if (pil + 1 > pir) load();
c = ibuf[pil++];
} while (isspace(c));
}
void rd1(string &x) {
x.clear();
char c;
do {
if (pil + 1 > pir) load();
c = ibuf[pil++];
} while (isspace(c));
do {
x += c;
if (pil == pir) load();
c = ibuf[pil++];
} while (!isspace(c));
}
template <typename T>
void rd1_real(T &x) {
string s;
rd1(s);
if constexpr (is_same_v<T, long double>)
x = stold(s);
else
x = stod(s);
}
template <typename T>
void rd1_integer(T &x) {
if (pil + 100 > pir) load();
char c;
do
c = ibuf[pil++];
while (c < '-');
bool minus = 0;
if constexpr (is_signed<T>::value || is_same_v<T, i128>) {
if (c == '-') { minus = 1, c = ibuf[pil++]; }
}
using U = unsigned_integer_t<T>;
U val = 0;
while ('0' <= c) { val = val * 10 + (c & 15), c = ibuf[pil++]; }
pil--;
if constexpr (is_signed<T>::value || is_same_v<T, i128>)
{
if (minus)
{
const U min_abs = U(numeric_limits<T>::max()) + 1;
assert(val <= min_abs);
x = val == min_abs ? numeric_limits<T>::lowest() : -T(val);
}
else
{
assert(val <= U(numeric_limits<T>::max()));
x = T(val);
}
}
else
x = T(val);
}
void rd1(int &x) { rd1_integer(x); }
void rd1(ll &x) { rd1_integer(x); }
void rd1(i128 &x) { rd1_integer(x); }
void rd1(uint &x) { rd1_integer(x); }
void rd1(ull &x) { rd1_integer(x); }
void rd1(u128 &x) { rd1_integer(x); }
void rd1(double &x) { rd1_real(x); }
void rd1(long double &x) { rd1_real(x); }
template <class T, class U>
void rd1(pair<T, U> &p) {
return rd1(p.first), rd1(p.second);
}
template <class... T>
void rd1(tuple<T...> &tpl) {
apply([](auto &...x) { (rd1(x), ...); }, tpl);
}
template <size_t N = 0, typename T>
void rd1(array<T, N> &x) {
for (auto &d: x) rd1(d);
}
template <class T>
void rd1(vc<T> &x) {
for (auto &d: x) rd1(d);
}
template <class... T>
void read(T &...x) {
(rd1(x), ...);
}
void wt1(const char c) {
if (por == SIZ) flush();
obuf[por++] = c;
}
void wt1(const string s) {
for (char c: s) wt1(c);
}
void wt1(const char *s) {
size_t len = strlen(s);
for (size_t i = 0; i < len; i++) wt1(s[i]);
}
template <typename T>
void wt1_integer(T x) {
if (por > SIZ - 100) flush();
using U = unsigned_integer_t<T>;
U ux;
if constexpr (is_signed<T>::value || is_same_v<T, i128>)
{
if (x < 0)
obuf[por++] = '-', ux = U(0) - U(x);
else
ux = U(x);
}
else
ux = x;
int outi;
for (outi = 96; ux >= 10000; outi -= 4) {
memcpy(out + outi, pre.num[ux % 10000], 4);
ux /= 10000;
}
if (ux >= 1000) {
memcpy(obuf + por, pre.num[ux], 4);
por += 4;
} else if (ux >= 100) {
memcpy(obuf + por, pre.num[ux] + 1, 3);
por += 3;
} else if (ux >= 10) {
int q = (ux * 103) >> 10;
obuf[por] = q | '0';
obuf[por + 1] = (ux - q * 10) | '0';
por += 2;
} else
obuf[por++] = ux | '0';
memcpy(obuf + por, out + outi + 4, 96 - outi);
por += 96 - outi;
}
template <typename T>
void wt1_real(T x) {
ostringstream oss;
oss << fixed << setprecision(15) << x;
string s = oss.str();
wt1(s);
}
void wt1(int x) { wt1_integer(x); }
template <class T, enable_if_t<is_integral_v<T>, int> = 0>
void wt1(T x) { wt1_integer(x); }
void wt1(i128 x) { wt1_integer(x); }
void wt1(u128 x) { wt1_integer(x); }
void wt1(double x) { wt1_real(x); }
void wt1(long double x) { wt1_real(x); }
template <class T, class U>
void wt1(const pair<T, U> &val) {
wt1(val.first);
wt1(' ');
wt1(val.second);
}
template <class... T>
void wt1(const tuple<T...> &tpl) {
if constexpr (sizeof...(T))
{
int i = 0;
apply([&](const auto &...x)
{ ((i++ ? wt1(' ') : void(), wt1(x)), ...); }, tpl);
}
}
template <class T, size_t S>
void wt1(const array<T, S> &val) {
auto n = val.size();
for (size_t i = 0; i < n; i++) {
if (i) wt1(' ');
wt1(val[i]);
}
}
template <class T>
void wt1(const vector<T> &val) {
auto n = val.size();
for (size_t i = 0; i < n; i++) {
if (i) wt1(' ');
wt1(val[i]);
}
}
template <class... T>
void write(T &&...x) {
(wt1(std::forward<T>(x)), ...);
}
template <class... T>
void print(T &&...x) {
if constexpr (sizeof...(T))
{
int i = 0;
((i++ ? wt1(' ') : void(), wt1(std::forward<T>(x))), ...);
}
wt1('\n');
}
}
#endif
#if defined FAST_IO and not defined LOCAL
struct Dummy {
Dummy() { atexit(fastio::flush); }
} dummy;
#endif
#if defined LOCAL or not defined FAST_IO
template <class T, class U>
istream &operator>>(istream &is, pair<T, U> &p)
{
is >> p.first >> p.second;
return is;
}
template <class... Ts>
istream &operator>>(istream &is, tuple<Ts...> &t)
{
apply([&](auto &...a)
{ (is >> ... >> a); }, t);
return is;
}
template <class T, size_t n>
istream &operator>>(istream &is, array<T, n> &a)
{
for (size_t i = 0; i < n; i++)
is >> a[i];
return is;
}
template <class T>
istream &operator>>(istream &is, vc<T> &a)
{
const size_t n = a.size();
for (size_t i = 0; i < n; i++)
is >> a[i];
return is;
}
#endif
namespace internal
{
#if defined LOCAL or not defined FAST_IO
template <class... Ts>
void CIN(Ts &...a) { (cin >> ... >> a); }
#endif
#if defined FAST_IO and not defined LOCAL
template <class... Ts>
void READnodump(Ts &...a) { fastio::read(a...); }
#else
template <class... Ts>
void READnodump(Ts &...a) { CIN(a...); }
#endif
template <class... T>
void READVECnodump(int n, vc<T> &...v)
{
(v.resize(n), ...);
READnodump(v...);
}
template <class... T>
void READVEC2nodump(int n, int m, vvc<T> &...v)
{
(v.assign(n, vc<T>(m)), ...);
READnodump(v...);
}
template <class... T>
void READJAGnodump(int n, vvc<T> &...vs)
{
auto read_one = [&](auto &v)
{
v.resize(n);
for (auto &row : v)
{
int k;
READnodump(k);
row.resize(k);
READnodump(row);
}
};
(read_one(vs), ...);
}
};
#define READ(...) internal::READnodump(__VA_ARGS__); dump(__VA_ARGS__)
#define IN(T, ...) T __VA_ARGS__; READ(__VA_ARGS__)
#define CHAR(...) IN(char, __VA_ARGS__)
#define INT(...) IN(int, __VA_ARGS__)
#define LL(...) IN(ll, __VA_ARGS__)
#define STR(...) IN(string, __VA_ARGS__)
#define ARR(T, n, ...) array<T, n> __VA_ARGS__; READ(__VA_ARGS__)
#define READVEC(...) internal::READVECnodump(__VA_ARGS__); dump(__VA_ARGS__)
#define READVEC2(...) internal::READVEC2nodump(__VA_ARGS__); dump(__VA_ARGS__)
#define VEC(T, n, ...) vc<T> __VA_ARGS__; READVEC(n, __VA_ARGS__)
#define VEC2(T, n, m, ...) vvc<T> __VA_ARGS__; READVEC2(n, m, __VA_ARGS__)
#define READJAG(...) internal::READJAGnodump(__VA_ARGS__); dump(__VA_ARGS__)
#define JAG(T, n, ...) vvc<T> __VA_ARGS__; READJAG(n, __VA_ARGS__)
#ifdef INTERACTIVE
#define ENDL endl
#else
#define ENDL '\n'
#endif
#if defined LOCAL or not defined FAST_IO
template <class T, class U>
ostream &operator<<(ostream &os, const pair<T, U> &p)
{
os << p.first << ' ' << p.second;
return os;
}
template <class... Ts>
ostream &operator<<(ostream &os, const tuple<Ts...> &t)
{
if constexpr (sizeof...(Ts))
{
apply([&](const auto &...x)
{
int i = 0;
((os << (i++ ? " " : "") << x), ...);
}, t);
}
return os;
}
template <class T, size_t n>
ostream &operator<<(ostream &os, const array<T, n> &a)
{
for (size_t i = 0; i < n; i++)
{
if (i)
os << ' ';
os << a[i];
}
return os;
}
template <class T>
ostream &operator<<(ostream &os, const vc<T> &v)
{
const size_t n = v.size();
for (size_t i = 0; i < n; i++)
{
if (i)
os << ' ';
os << v[i];
}
return os;
}
namespace internal
{
template <class... Ts>
void COUTW(const Ts &...a)
{
if constexpr (sizeof...(Ts))
(cout << ... << a);
}
template <class... Ts>
void COUTP(const Ts &...a)
{
if constexpr (sizeof...(Ts))
{
int i = 0;
((cout << (i++ ? " " : "") << a), ...);
}
cout << ENDL;
}
};
#endif
#if defined FAST_IO and not defined LOCAL
#define WRITE fastio::write
#define PRINT fastio::print
#else
#define WRITE internal::COUTW
#define PRINT internal::COUTP
#endif
#define PRINTEXIT(...) do { PRINT(__VA_ARGS__); exit(0); } while (false)
#define PRINTRETURN(...) do { PRINT(__VA_ARGS__); return; } while (false)
template <class T>
void PRINTV(const vc<T> &v) { for (auto &vi : v) PRINT(vi); }
#define PRINTVEXIT(...) do { PRINTV(__VA_ARGS__); exit(0); } while (false)
#define PRINTVRETURN(...) do { PRINTV(__VA_ARGS__); return; } while (false)
template <class T, class U, class P>
pair<T, U> &operator+=(pair<T, U> &a, const P &b)
{
a.first += b.first;
a.second += b.second;
return a;
}
template <class T, class U, class P>
pair<T, U> operator+(pair<T, U> a, const P &b) { return a += b; }
template <class T, class U, class P>
pair<T, U> &operator-=(pair<T, U> &a, const P &b)
{
a.first -= b.first;
a.second -= b.second;
return a;
}
template <class T, class U, class P>
pair<T, U> operator-(pair<T, U> a, const P &b) { return a -= b; }
template <class T, class U>
pair<T, U> operator-(pair<T, U> a)
{
a.first = -a.first;
a.second = -a.second;
return a;
}
template <class T, size_t n, class A>
array<T, n> &operator+=(array<T, n> &a, const A &b)
{
for (size_t i = 0; i < n; i++)
a[i] += b[i];
return a;
}
template <class T, size_t n, class A>
array<T, n> operator+(array<T, n> a, const A &b) { return a += b; }
template <class T, size_t n, class A>
array<T, n> &operator-=(array<T, n> &a, const A &b)
{
for (size_t i = 0; i < n; i++)
a[i] -= b[i];
return a;
}
template <class T, size_t n, class A>
array<T, n> operator-(array<T, n> a, const A &b) { return a -= b; }
template <class T, size_t n>
array<T, n> operator-(array<T, n> a)
{
for (auto &ai : a)
ai = -ai;
return a;
}
namespace internal
{
template <size_t... I, class A, class B>
auto &tuple_add_impl(A &a, const B &b, const index_sequence<I...>)
{
((get<I>(a) += get<I>(b)), ...);
return a;
}
template <size_t... I, class A, class B>
auto &tuple_sub_impl(A &a, const B &b, const index_sequence<I...>)
{
((get<I>(a) -= get<I>(b)), ...);
return a;
}
template <size_t... I, class A>
auto &tuple_neg_impl(A &a, const index_sequence<I...>)
{
((get<I>(a) = -get<I>(a)), ...);
return a;
}
};
template <class... Ts, class Tp>
tuple<Ts...> &operator+=(tuple<Ts...> &a, const Tp &b)
{ return internal::tuple_add_impl(a, b, make_index_sequence<tuple_size_v<tuple<Ts...>>>{}); }
template <class... Ts, class Tp>
tuple<Ts...> operator+(tuple<Ts...> a, const Tp &b) { return a += b; }
template <class... Ts, class Tp>
tuple<Ts...> &operator-=(tuple<Ts...> &a, const Tp &b)
{ return internal::tuple_sub_impl(a, b, make_index_sequence<tuple_size_v<tuple<Ts...>>>{}); }
template <class... Ts, class Tp>
tuple<Ts...> operator-(tuple<Ts...> a, const Tp &b) { return a -= b; }
template <class... Ts>
tuple<Ts...> operator-(tuple<Ts...> a)
{
internal::tuple_neg_impl(a, make_index_sequence<sizeof...(Ts)>{});
return a;
}
template <class T, class Add>
void offset(vc<T> &v, const Add &add) { for (auto &vi : v) vi += add; }
template <class T, class Add>
void offset(vvc<T> &v, const Add &add) { for (auto &vi : v) for (auto &vij : vi) vij += add; }
template <class T, const size_t m>
array<vc<T>, m> unzip(const vc<array<T, m>> &vt)
{
const size_t n = vt.size();
array<vc<T>, m> tv;
tv.fill(vc<T>(n));
for (size_t i = 0; i < n; i++)
for (size_t j = 0; j < m; j++)
tv[j][i] = vt[i][j];
return tv;
}
template <class T, const size_t m>
vc<array<T, m>> zip(const array<vc<T>, m> &tv)
{
if (tv.empty()) return {};
const size_t n = tv[0].size();
vc<array<T, m>> vt(n);
for (size_t j = 0; j < m; j++)
{
assert(tv[j].size() == n);
for (size_t i = 0; i < n; i++)
vt[i][j] = tv[j][i];
}
return vt;
}
template <class T, class U>
pair<vc<T>, vc<U>> unzip(const vc<pair<T, U>> &vt)
{
const size_t n = vt.size();
pair<vc<T>, vc<U>> tv;
tv.first.resize(n), tv.second.resize(n);
for (size_t i = 0; i < n; i++)
tie(tv.first[i], tv.second[i]) = vt[i];
return tv;
}
template <class T, class U>
vc<pair<T, U>> zip(const pair<vc<T>, vc<U>> &tv)
{
const size_t n = tv.first.size();
assert(n == tv.second.size());
vc<pair<T, U>> vt(n);
for (size_t i = 0; i < n; i++)
vt[i] = make_pair(tv.first[i], tv.second[i]);
return vt;
}
namespace internal
{
template <size_t... I, class V, class Tp>
auto vt_to_tv_impl(V &tv, const Tp &t, index_sequence<I...>, size_t index)
{ ((get<I>(tv)[index] = get<I>(t)), ...); }
template <size_t... I, class Tp>
auto tv_to_vt_impl(const Tp &tv, index_sequence<I...>, size_t index)
{ return make_tuple(get<I>(tv)[index]...); }
};
template <class... Ts>
auto unzip(const vc<tuple<Ts...>> &vt)
{
const size_t n = vt.size();
tuple<vc<Ts>...> tv;
apply([&](auto &...v)
{ ((v.resize(n)), ...); }, tv);
for (size_t i = 0; i < n; i++)
internal::vt_to_tv_impl(tv, vt[i], make_index_sequence<tuple_size_v<decltype(tv)>>{}, i);
return tv;
}
template <class... Ts>
auto zip(const tuple<vc<Ts>...> &tv)
{
size_t n = get<0>(tv).size();
apply([&](auto &...v)
{ ((void(v), assert(v.size() == n)), ...); }, tv);
vc<tuple<Ts...>> vt(n);
for (size_t i = 0; i < n; i++)
vt[i] = internal::tv_to_vt_impl(tv, index_sequence_for<Ts...>{}, i);
return vt;
}
#define UNZIP(vt, ...) auto [__VA_ARGS__] = unzip(vt)
#define ZIP(vt, ...) auto vt = zip(tuple{__VA_ARGS__})
mt19937_64 mt;
template <class T = ll, class U1, class U2>
T randint(U1 l, U2 r)
{
assert(T(l) <= T(r));
return uniform_int_distribution<T>(T(l), T(r))(mt);
}
template <class T = ll, class U1, class U2>
T randrange(U1 l, U2 r)
{
assert(T(l) < T(r));
return uniform_int_distribution<T>(T(l), T(r) - 1)(mt);
}
template <class T = double, class U1, class U2>
T randreal(U1 l, U2 r)
{
assert(T(l) < T(r));
return uniform_real_distribution<T>(T(l), T(r))(mt);
}
bool randbool(double p)
{
assert(0 <= p && p <= 1);
return bernoulli_distribution(p)(mt);
}
namespace internal
{
template <bool does_sort, class V, class T>
void random_sample_range(V &res, T l, T r)
{
int k = res.size();
T n = r - l;
if (k <= 256)
{
repi(i, k)
{
T j = n - T(k) + T(i), x = randint<T>(0, j);
if (find(res.begin(), res.begin() + i, x) != res.begin() + i)
x = j;
res[i] = x;
}
}
else
{
unordered_set<T> used;
used.reserve(2 * size_t(k));
repi(i, k)
{
T j = n - T(k) + T(i), x = randint<T>(0, j);
if (!used.insert(x).second)
x = j, used.insert(x);
res[i] = x;
}
}
for (T &x : res) x += l;
if constexpr (does_sort)
sort(res.begin(), res.end());
else
shuffle(res.begin(), res.end(), mt);
}
};
template <int k, bool does_sort, class T = ll, class U1, class U2>
array<T, k> random_sample_range_array(U1 l, U2 r)
{
assert(T(r) - T(l) >= T(k));
array<T, k> res;
internal::random_sample_range<does_sort>(res, T(l), T(r));
return res;
}
template <bool does_sort, class T = ll, class U1, class U2>
vc<T> random_sample_range_vector(U1 l, U2 r, int k)
{
assert(k >= 0);
assert(T(r) - T(l) >= T(k));
vc<T> res(k);
internal::random_sample_range<does_sort>(res, T(l), T(r));
return res;
}
template <class T>
struct larger_int
{
using type = T;
};
#define LARGER_INT(T, U) \
template <> \
struct larger_int<T> \
{ \
using type = U; \
};
LARGER_INT(signed char, short)
LARGER_INT(short, int)
LARGER_INT(int, long long)
LARGER_INT(long, __int128_t)
LARGER_INT(long long, __int128_t)
LARGER_INT(unsigned char, unsigned short)
LARGER_INT(unsigned short, unsigned int)
LARGER_INT(unsigned int, unsigned long long)
LARGER_INT(unsigned long, __uint128_t)
LARGER_INT(unsigned long long, __uint128_t)
#undef LARGER_INT
template <class T>
using larger_int_t = typename larger_int<T>::type;
namespace internal
{
template <class T>
constexpr ll powmod_constexpr(ll x, ll n, T m)
{
if (m == 1)
return 0;
using U = make_unsigned_t<T>;
using L = larger_int_t<U>;
U r = 1, y = safemod(x, m);
while (n)
{
if (n & 1)
r = L(r) * y % m;
y = L(y) * y % m;
n >>= 1;
}
return r;
}
template <class T>
constexpr bool isprime_constexpr(T n)
{
if constexpr (sizeof(T) > 4)
{
if (n <= INT_MAX)
return isprime_constexpr<int>(n);
}
if (n <= 1)
return false;
if (n == 2 || n == 7 || n == 61)
return true;
if (n % 2 == 0)
return false;
ll d = n - 1;
while (d % 2 == 0)
d /= 2;
using U = make_unsigned_t<T>;
using L = larger_int_t<U>;
auto miller_rabin = [&](const auto &bases) constexpr
{
for (ll a : bases)
{
ll t = d, y = powmod_constexpr(a, t, n);
while (t != n - 1 && y != 1 && y != n - 1)
{
y = L(y) * y % n;
t <<= 1;
}
if (y != n - 1 && t % 2 == 0)
return false;
}
return true;
};
if constexpr(sizeof(T) <= 4)
{
constexpr ll bases[3] = {2, 7, 61};
return miller_rabin(bases);
}
else
{
constexpr ll bases[7] = {2, 325, 9375, 28178, 450775, 9780504, 1795265022};
return miller_rabin(bases);
}
}
template <auto n>
constexpr bool isprime = isprime_constexpr(n);
};
namespace internal
{
template <auto M>
struct policy_static
{
using mod_type = decltype(M);
using value_type = make_unsigned_t<mod_type>;
using calc_type = larger_int_t<value_type>;
static constexpr bool is_prime = isprime_constexpr(M);
static constexpr mod_type mod() { return M; }
static constexpr value_type umod() { return M; }
static constexpr value_type init(value_type v) { return v; }
static constexpr mod_type val(value_type v) { return v; }
static constexpr value_type mul(value_type a, value_type b)
{
return (value_type)((calc_type(a) * b) % M);
}
};
};
namespace internal
{
struct barrett32
{
uint m;
ull im;
explicit barrett32(uint m) : m(m), im((ull)(-1) / m + 1) {}
uint umod() const { return m; }
uint mul(uint a, uint b) const
{
ull z = a;
z *= b;
ull x = ull((u128(z) * im) >> 64);
ull y = x * m;
return uint(z - y + (z < y ? m : 0));
}
};
template <int id>
struct policy_barrett32
{
using value_type = uint;
using calc_type = ull;
using mod_type = int;
static constexpr bool is_prime = false;
static inline barrett32 reducer{998244353};
static void set_mod(mod_type m) { reducer = barrett32(m); }
static mod_type mod() { return reducer.umod(); }
static value_type umod() { return reducer.umod(); }
static value_type init(value_type v) { return v; }
static mod_type val(value_type v) { return v; }
static value_type mul(value_type a, value_type b) { return reducer.mul(a, b); }
};
};
namespace internal
{
inline constexpr ull inv64(ull a)
{
ull x = a;
while (a * x != 1) x *= 2 - a * x;
return x;
}
struct montgomery64odd
{
ull m, im, sq;
explicit montgomery64odd(ull m) : m(m), im(inv64(m)), sq(-u128(m) % m) {}
ull umod() const { return m; }
ull reduce(u128 x) const
{
auto t = (x + u128(m) * (-im * ull(x))) >> 64;
if (t >= m) t -= m;
return (ull)t;
}
ull inv_reduce(i128 v) const { return reduce(u128(v % m + m) * sq); }
};
struct montgomery64
{
ull m, mx, imx, d, q;
uint b;
explicit montgomery64(ull m) : m(m)
{
b = countr_zero(m), mx = m >> b;
imx = inv64(mx);
d = powmod_constexpr((mx + 1) / 2, b, mx);
u128 sq = -u128(mx) % mx;
q = (1 + (((sq - 1) * d) << b)) % m;
}
ull umod() const { return m; }
ull reduce(u128 x) const
{
if (b == 0)
{
auto t = (x + u128(mx) * (-imx * ull(x))) >> 64;
if (t >= m) t -= m;
return (ull)t;
}
ull p = x & MASK(b);
x = (x >> b) + p * d;
ull y = p << (64 - b);
auto t = (x + u128(mx) * (imx * (y - ull(x)))) >> (64 - b);
if (t >= m) { t -= m; if (t >= m) t -= m; }
return (ull)t;
}
ull inv_reduce(i128 v) const { return reduce(u128(v % m + m) * q); }
};
template <int id>
struct policy_montgomery64_odd
{
using value_type = ull;
using calc_type = u128;
using mod_type = ll;
static constexpr bool is_prime = false;
static inline montgomery64odd reducer{(1LL << 61) - 1};
static void set_mod(mod_type m) { reducer = montgomery64odd(m); }
static mod_type mod() { return reducer.umod(); }
static value_type umod() { return reducer.umod(); }
static value_type init(value_type v) { return reducer.inv_reduce(v); }
static mod_type val(value_type v) { return reducer.reduce(v); }
static value_type mul(value_type a, value_type b) { return reducer.reduce((calc_type)a * b); }
};
template <int id>
struct policy_montgomery64
{
using value_type = ull;
using calc_type = u128;
using mod_type = ll;
static constexpr bool is_prime = false;
static inline montgomery64 reducer{(1LL << 61) - 1};
static void set_mod(mod_type m) { reducer = montgomery64(m); }
static mod_type mod() { return reducer.umod(); }
static value_type umod() { return reducer.umod(); }
static value_type init(value_type v) { return reducer.inv_reduce(v); }
static mod_type val(value_type v) { return reducer.reduce(v); }
static value_type mul(value_type a, value_type b) { return reducer.reduce((calc_type)a * b); }
};
};
template <class T = ll>
constexpr tuple<T, T, T> extgcd(T a, T b)
{
if (a == 0 && b == 0)
return {0, 0, 0};
T x1 = 1, y1 = 0, z1 = a;
T x2 = 0, y2 = 1, z2 = b;
while (z2 != 0)
{
T q = z1 / z2;
tie(x1, x2) = make_pair(x2, x1 - q * x2);
tie(y1, y2) = make_pair(y2, y1 - q * y2);
tie(z1, z2) = make_pair(z2, z1 - q * z2);
}
if (z1 < 0)
x1 = -x1, y1 = -y1, z1 = -z1;
return {z1, x1, y1};
}
namespace internal
{
template <class Policy>
struct modint_impl
{
using V = typename Policy::value_type;
using M = typename Policy::mod_type;
using mint = modint_impl;
private:
V _v;
public:
static constexpr M mod() { return Policy::mod(); }
template <class T = Policy>
static auto set_mod(M m) -> decltype(T::set_mod(m)) { return T::set_mod(m); }
static mint raw(V v)
{
mint x;
x._v = v;
return x;
}
modint_impl() : _v(0) {}
template <class T, typename = enable_if_t<is_integral_ext<T>>>
modint_impl(T v)
{
V rem;
if constexpr (is_signed_ext<T>)
{
using S = make_signed_t<V>;
S x = v % S(Policy::umod());
if (x < 0)
x += Policy::umod();
rem = x;
}
else
rem = V(v % Policy::umod());
_v = Policy::init(rem);
};
M val() const { return Policy::val(_v); }
mint &operator+=(const mint &rhs)
{
_v += rhs._v;
if (_v >= Policy::umod())
_v -= Policy::umod();
return *this;
}
mint &operator-=(const mint &rhs)
{
_v -= rhs._v;
if (_v >= Policy::umod())
_v += Policy::umod();
return *this;
}
mint &operator*=(const mint &rhs)
{
_v = Policy::mul(_v, rhs._v);
return *this;
}
mint &operator/=(const mint &rhs)
{
return *this *= rhs.inv();
}
mint &operator++()
{
_v++;
if (_v == Policy::umod())
_v = 0;
return *this;
}
mint &operator--()
{
if (_v == 0)
_v = Policy::umod();
_v--;
return *this;
}
mint operator++(int)
{
mint res = *this;
++(*this);
return res;
}
mint operator--(int)
{
mint res = *this;
--(*this);
return res;
}
mint operator+() const { return *this; }
mint operator-() const { return mint() - *this; }
template <class T>
mint pow(T n) const
{
assert(n >= 0);
mint x = *this, r = 1;
while (n)
{
if (n & 1)
r *= x;
x *= x;
n >>= 1;
}
return r;
}
mint inv() const
{
if constexpr (Policy::is_prime)
{
return pow(mod() - 2);
}
else
{
auto [g, x, y] = extgcd<M>(val(), mod());
assert(g == 1);
return mint(x);
}
}
friend mint operator+(const mint &lhs, const mint &rhs) { return mint(lhs) += rhs; }
friend mint operator-(const mint &lhs, const mint &rhs) { return mint(lhs) -= rhs; }
friend mint operator*(const mint &lhs, const mint &rhs) { return mint(lhs) *= rhs; }
friend mint operator/(const mint &lhs, const mint &rhs) { return mint(lhs) /= rhs; }
friend bool operator==(const mint &lhs, const mint &rhs) { return lhs._v == rhs._v; }
friend bool operator!=(const mint &lhs, const mint &rhs) { return lhs._v != rhs._v; }
friend M safe_hash_key(const mint &x) { return x.val(); }
#if defined LOCAL or not defined FAST_IO
friend std::istream &operator>>(std::istream &is, mint &x)
{
long long a;
is >> a;
x = a;
return is;
}
friend std::ostream &operator<<(std::ostream &os, const mint &x)
{
os << x.val();
return os;
}
#else
friend void rd1(mint &x)
{
long long a;
fastio::rd1(a);
x = a;
}
friend void wt1(const mint &x)
{
fastio::wt1(x.val());
}
#endif
};
};
template <int mod>
using static_modint32 = internal::modint_impl<internal::policy_static<mod>>;
template <int id>
using dynamic_modint32 = internal::modint_impl<internal::policy_barrett32<id>>;
template <ll mod>
using static_modint64 = internal::modint_impl<internal::policy_static<mod>>;
template <int id>
using dynamic_modint64_odd = internal::modint_impl<internal::policy_montgomery64_odd<id>>;
template <int id>
using dynamic_modint64 = internal::modint_impl<internal::policy_montgomery64<id>>;
using modint998244353 = static_modint32<998244353>;
using modint1000000007 = static_modint32<1000000007>;
using modint = dynamic_modint32<-1>;
using modint61 = static_modint64<(1LL << 61) - 1>;
using modint64 = dynamic_modint64<-1>;
template <class T>
struct is_modint : std::false_type
{
};
template <class Policy>
struct is_modint<internal::modint_impl<Policy>> : std::true_type
{
};
template <class T>
inline constexpr bool is_modint_v = is_modint<T>::value;
template <class T>
struct is_static_modint : false_type {};
template <int m>
struct is_static_modint<static_modint32<m>> : true_type {};
template <ll m>
struct is_static_modint<static_modint64<m>> : true_type {};
template <class T>
inline constexpr bool is_static_modint_v = is_static_modint<T>::value;
template <class T>
struct is_dynamic_modint : false_type {};
template <int id>
struct is_dynamic_modint<dynamic_modint32<id>> : true_type {};
template <int id>
struct is_dynamic_modint<dynamic_modint64_odd<id>> : true_type {};
template <int id>
struct is_dynamic_modint<dynamic_modint64<id>> : true_type {};
template <class T>
inline constexpr bool is_dynamic_modint_v = is_dynamic_modint<T>::value;
template <typename, typename = void>
struct has_mod : std::false_type
{
};
template <typename T>
struct has_mod<T, std::void_t<decltype(T::mod())>> : std::true_type
{
};
template <class mint>
struct modint_less
{
bool operator()(const mint &a, const mint &b) const
{
if constexpr (is_modint_v<mint>)
return a.val() < b.val();
else
return a < b;
}
};
template <class mint>
struct modint_hash
{
auto operator()(const mint &x) const
{
if constexpr (is_modint_v<mint>)
return std::hash<decltype(x.val())>{}(x.val());
else
return std::hash<mint>{}(x);
}
};
template <class mint>
struct PowerTable
{
private:
decltype(mint::mod()) mod;
mint base;
vc<mint> pw;
public:
PowerTable() {}
PowerTable(const mint &base) : mod(mint::mod()), base(base), pw(1, 1) {}
void reserve(int n)
{
if (mod != mint::mod())
{
mod = mint::mod();
pw = {1};
}
int i = pw.size();
if (n < i)
return;
pw.resize(n + 1);
for (; i <= n; i++)
pw[i] = pw[i - 1] * base;
}
mint pow(int n)
{
reserve(n);
return pw[n];
}
};
template <class T>
struct Binomial
{
private:
inline static decltype(T::mod()) mod;
public:
inline static vc<T> fac_, finv_, inv_;
static void reserve(int n)
{
if constexpr (is_dynamic_modint_v<T>)
{
if (mod != T::mod())
{
mod = T::mod();
fac_ = {1, 1}, finv_ = {1, 1}, inv_ = {0, 1};
}
}
else
{
if (fac_.empty())
fac_ = {1, 1}, finv_ = {1, 1}, inv_ = {0, 1};
}
if (n < SZ(fac_))
return;
chmin(n, T::mod() - 1);
int si = fac_.size();
fac_.resize(n + 1), finv_.resize(n + 1), inv_.resize(n + 1);
repi(i, si, n + 1)
{
fac_[i] = fac_[i - 1] * T::raw(i);
inv_[i] = -inv_[T::mod() % i] * T::raw(T::mod() / i);
finv_[i] = finv_[i - 1] * inv_[i];
}
}
static T fac(int n)
{
assert(n >= 0);
if (n >= T::mod())
return 0;
reserve(n);
return fac_[n];
}
static T finv(int n)
{
assert(n < T::mod());
if (n < 0)
return 0;
reserve(n);
return finv_[n];
}
static T inv(int n)
{
n %= T::mod();
if (n < 0)
n += T::mod();
assert(n != 0);
reserve(n);
return inv_[n];
}
static T P(int n, int k)
{
if (n < k)
return 0;
if (n < 0 || k < 0)
return 0;
if (n >= T::mod())
return 0;
reserve(n);
return fac_[n] * finv_[n - k];
}
static T C(int n, int k)
{
if (n < k)
return 0;
if (n < 0 || k < 0)
return 0;
if (n >= T::mod())
return 0;
reserve(n);
return fac_[n] * finv_[k] * finv_[n - k];
}
static T H(int n, int k)
{
if (n == 0 && k == 0)
return 1;
return C(n + k - 1, k);
}
};
template <class mint>
mint stom(string s)
{
mint res = 0;
fec(c : s)
{
res *= 10;
res += c - '0';
}
return res;
}
template <class T = ll, class U = larger_int_t<T>>
pair<T, T> svp2d(const pair<T, T> &a, const pair<T, T> &b)
{
assert((a != pair<T, T>{0, 0} && b != pair<T, T>{0, 0}));
auto [a1, a2] = a;
auto [b1, b2] = b;
if ((U)a1 * a1 + (U)a2 * a2 < (U)b1 * b1 + (U)b2 * b2)
swap(a1, b1), swap(a2, b2);
while ((U)a1 * a1 + (U)a2 * a2 > (U)b1 * b1 + (U)b2 * b2)
{
swap(a1, b1), swap(a2, b2);
T k = divround<U>((U)a1 * b1 + (U)a2 * b2, (U)a1 * a1 + (U)a2 * a2);
b1 -= k * a1, b2 -= k * a2;
if (b1 == 0 && b2 == 0)
return {a1, a2};
}
return {a1, a2};
}
template <class mint>
pair<decltype(mint(0).val()), decltype(mint(0).val())>
mint_to_rat(const mint &x)
{
auto [p, q] = svp2d({x.val(), 1}, {mint::mod(), 0});
if (q < 0)
p = -p, q = -q;
return {p, q};
}
#if __cplusplus >= 202302L
namespace cpp_dump
{
struct mint_to_rat_fn
{
template <class T>
constexpr auto operator()(const T &x) const -> decltype(mint_to_rat(x))
{
return mint_to_rat(x);
}
};
struct rat_closure : std::ranges::range_adaptor_closure<rat_closure>
{
template <typename T>
constexpr auto operator()(T &&t) const
{
if constexpr (!std::ranges::range<T> && std::invocable<mint_to_rat_fn, decltype(std::forward<T>(t))>)
{
return mint_to_rat_fn{}(std::forward<T>(t));
}
else if constexpr (std::ranges::range<T>)
{
using Ref = std::ranges::range_reference_t<T>;
if constexpr (std::invocable<mint_to_rat_fn, decltype(std::forward<Ref>(std::declval<Ref>()))>)
{
return std::forward<T>(t) | std::views::transform(mint_to_rat_fn{});
}
else if constexpr (std::ranges::range<Ref>)
{
return std::forward<T>(t) | std::views::transform([this](auto &&inner)
{ return (*this)(std::forward<decltype(inner)>(inner)); });
}
else
{
static_assert(false);
}
}
else
{
static_assert(false);
}
}
};
template <typename T>
requires(!std::ranges::range<T> && std::invocable<mint_to_rat_fn, T>)
constexpr auto operator|(T &&t, const rat_closure &c)
{
return c(std::forward<T>(t));
}
constexpr rat_closure rat()
{
return rat_closure{};
}
}
#endif
using mint = modint998244353;
using bi = Binomial<mint>;
void init()
{
oj(mt.seed(random_device()()));
}
template <typename Cost>
struct Edge
{
int from, to, index;
Cost cost;
Edge() {}
Edge(int s, int t, Cost c = 1, int i = -1) : from(s), to(t), index(i), cost(c) {}
operator int() const { return to; }
};
template <typename Cost>
struct Graph : vector<vector<Edge<Cost>>>
{
int n, m;
vector<Edge<Cost>> edges;
Graph() : n(0), m(0) {}
Graph(int n) : vector<vector<Edge<Cost>>>(n), n(n), m(0) {}
int add_edge(int s, int t, Cost c = 1)
{
(*this).at(s).emplace_back(s, t, c, m);
edges.emplace_back(s, t, c, m);
return m++;
}
int add_edge2(int s, int t, Cost c = 1)
{
(*this).at(s).emplace_back(s, t, c, m);
(*this).at(t).emplace_back(t, s, c, m);
edges.emplace_back(s, t, c, m);
return m++;
}
};
template<typename Cost>
struct EulerianTrailDirected : Graph<Cost>
{
public:
int n;
using Graph<Cost>::operator=;
EulerianTrailDirected() {}
EulerianTrailDirected(int n) : Graph<Cost>::Graph(n), n(n) {}
EulerianTrailDirected(Graph<Cost> &g) : n(g.n) { *this = g; }
vector<Edge<Cost>> run()
{
assert(n >= 1);
vector<int> in(n, 0), out(n, 0);
for (Edge<Cost> &e : this->edges)
in[e.to]++, out[e.from]++;
int sv = -1;
int s_cnt = 0, t_cnt = 0;
for (int v = 0; v < n; v++)
{
if (out[v] == in[v] + 1)
s_cnt++, sv = v;
else if (in[v] == out[v] + 1)
t_cnt++;
else if (in[v] != out[v])
return {};
}
if (s_cnt != t_cnt || s_cnt >= 2)
return {};
if (sv == -1)
sv = this->edges.empty() ? 0 : this->edges.front().from;
vector<Edge<Cost>> res;
Graph<Cost> g(*this);
auto dfs = [&](auto self, int u, const Edge<Cost> &e) -> void
{
while (!g[u].empty())
{
Edge<Cost> &f = g[u].back();
g[u].pop_back();
self(self, f.to, f);
}
res.emplace_back(e);
};
dfs(dfs, sv, Edge<Cost>(-1, sv));
reverse(res.begin(), res.end());
return res.size() == this->edges.size() + 1 ? res : vector<Edge<Cost>>();
}
};
template<typename Cost>
struct EulerianTrailUndirected : Graph<Cost>
{
public:
int n;
using Graph<Cost>::operator=;
EulerianTrailUndirected() {}
EulerianTrailUndirected(int n) : Graph<Cost>::Graph(n), n(n) {}
EulerianTrailUndirected(Graph<Cost> &g) : n(g.n) { *this = g; }
vector<Edge<Cost>> run()
{
assert(n >= 1);
vector<int> deg(n, 0);
for (Edge<Cost> &e : this->edges)
deg[e.to]++, deg[e.from]++;
int sv = -1;
int odd_cnt = 0;
for (int v = 0; v < n; v++)
{
if (deg[v] % 2 != 0)
odd_cnt++, sv = v;
}
if (odd_cnt != 0 && odd_cnt != 2)
return {};
if (sv == -1)
sv = this->edges.empty() ? 0 : this->edges.front().from;
vector<Edge<Cost>> res;
Graph<Cost> g(*this);
vector<bool> exists(this->edges.size(), true);
dump(g);
auto dfs = [&](auto self, int u, const Edge<Cost> &e) -> void
{
while (!g[u].empty())
{
Edge<Cost> f = g[u].back();
g[u].pop_back();
if (exists[f.index])
{
dump(e.from, e.to, f.from, f.to);
exists[f.index] = false;
self(self, f.to, f);
}
}
res.emplace_back(e);
};
dfs(dfs, sv, Edge<Cost>(-1, sv));
reverse(res.begin(), res.end());
return res.size() == this->edges.size() + 1 ? res : vector<Edge<Cost>>();
}
};
void main2()
{
const ll N = 26;
EulerianTrailDirected<ll> G(N);
rep(i, N) rep(j, N) G.add_edge(i, j);
auto res = G.run();
res.erase(res.begin());
fec(e : res) PRINT(string(1, 'A' + e.from) + string(1, 'A' + e.to));
}
void test()
{
}
template <auto init, auto main2, auto test>
struct Main
{
Main()
{
cauto CERR = [](string val, string color)
{
string s = "\033[" + color + "m" + val + "\033[m";
#ifdef LOCAL
cerr << s;
#endif
};
#if defined FAST_IO and not defined LOCAL
CERR("\n[FAST_IO]\n\n", "32");
#endif
#if defined FAST_CIO and not defined LOCAL
CERR("\n[FAST_CIO]\n\n", "32");
cin.tie(0);
ios::sync_with_stdio(false);
#endif
cout << fixed << setprecision(20);
init();
#ifdef LOCAL
test();
#endif
#if defined AOJ_TESTCASE or (defined LOCAL and defined SINGLE_TESTCASE)
CERR("\n[AOJ_TESTCASE]\n\n", "35");
while (true)
{
dump("new testcase");
main2();
}
#elif defined SINGLE_TESTCASE
CERR("\n[SINGLE_TESTCASE]\n\n", "36");
main2();
#elif defined MULTI_TESTCASE
CERR("\n[MULTI_TESTCASE]\n\n", "33");
local(while (true))
{
dump("T");
IN(uint, T);
while (T--)
{
dump("new testcase");
main2();
}
}
#endif
}
};
Main<init, main2, test> main_dummy;
int main() {}