結果

問題 No.1520 Zigzag Sum
ユーザー rniya
提出日時 2021-05-28 20:38:09
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 45 ms / 2,000 ms
コード長 8,158 bytes
コンパイル時間 2,096 ms
コンパイル使用メモリ 195,980 KB
最終ジャッジ日時 2025-01-21 19:09:28
ジャッジサーバーID
(参考情報)
judge2 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 1
other AC * 7
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#define LOCAL
#include <bits/stdc++.h>
using namespace std;
#pragma region Macros
typedef long long ll;
typedef __int128_t i128;
typedef unsigned int uint;
typedef unsigned long long ull;
#define ALL(x) (x).begin(), (x).end()
template <typename T> istream& operator>>(istream& is, vector<T>& v) {
for (T& x : v) is >> x;
return is;
}
template <typename T> ostream& operator<<(ostream& os, const vector<T>& v) {
for (int i = 0; i < (int)v.size(); i++) {
os << v[i] << (i + 1 == (int)v.size() ? "" : " ");
}
return os;
}
template <typename T, typename U> ostream& operator<<(ostream& os, const pair<T, U>& p) {
os << '(' << p.first << ',' << p.second << ')';
return os;
}
template <typename T, typename U, typename V> ostream& operator<<(ostream& os, const tuple<T, U, V>& t) {
os << '(' << get<0>(t) << ',' << get<1>(t) << ',' << get<2>(t) << ')';
return os;
}
template <typename T, typename U, typename V, typename W> ostream& operator<<(ostream& os, const tuple<T, U, V, W>& t) {
os << '(' << get<0>(t) << ',' << get<1>(t) << ',' << get<2>(t) << ',' << get<3>(t) << ')';
return os;
}
template <typename T, typename U> ostream& operator<<(ostream& os, const map<T, U>& m) {
os << '{';
for (auto itr = m.begin(); itr != m.end();) {
os << '(' << itr->first << ',' << itr->second << ')';
if (++itr != m.end()) os << ',';
}
os << '}';
return os;
}
template <typename T, typename U> ostream& operator<<(ostream& os, const unordered_map<T, U>& m) {
os << '{';
for (auto itr = m.begin(); itr != m.end();) {
os << '(' << itr->first << ',' << itr->second << ')';
if (++itr != m.end()) os << ',';
}
os << '}';
return os;
}
template <typename T> ostream& operator<<(ostream& os, const set<T>& s) {
os << '{';
for (auto itr = s.begin(); itr != s.end();) {
os << *itr;
if (++itr != s.end()) os << ',';
}
os << '}';
return os;
}
template <typename T> ostream& operator<<(ostream& os, const multiset<T>& s) {
os << '{';
for (auto itr = s.begin(); itr != s.end();) {
os << *itr;
if (++itr != s.end()) os << ',';
}
os << '}';
return os;
}
template <typename T> ostream& operator<<(ostream& os, const unordered_set<T>& s) {
os << '{';
for (auto itr = s.begin(); itr != s.end();) {
os << *itr;
if (++itr != s.end()) os << ',';
}
os << '}';
return os;
}
template <typename T> ostream& operator<<(ostream& os, const deque<T>& v) {
for (int i = 0; i < (int)v.size(); i++) {
os << v[i] << (i + 1 == (int)v.size() ? "" : " ");
}
return os;
}
void debug_out() { cerr << '\n'; }
template <class Head, class... Tail> void debug_out(Head&& head, Tail&&... tail) {
cerr << head;
if (sizeof...(Tail) > 0) cerr << ", ";
debug_out(move(tail)...);
}
#ifdef LOCAL
#define debug(...) \
cerr << " "; \
cerr << #__VA_ARGS__ << " :[" << __LINE__ << ":" << __FUNCTION__ << "]" << '\n'; \
cerr << " "; \
debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif
template <typename T> T gcd(T x, T y) { return y != 0 ? gcd(y, x % y) : x; }
template <typename T> T lcm(T x, T y) { return x / gcd(x, y) * y; }
template <class T1, class T2> inline bool chmin(T1& a, T2 b) {
if (a > b) {
a = b;
return true;
}
return false;
}
template <class T1, class T2> inline bool chmax(T1& a, T2 b) {
if (a < b) {
a = b;
return true;
}
return false;
}
#pragma endregion
/**
* @brief modint
* @docs docs/modulo/modint.md
*/
template <uint32_t mod> class modint {
using i64 = int64_t;
using u32 = uint32_t;
using u64 = uint64_t;
public:
u32 v;
constexpr modint(const i64 x = 0) noexcept : v(x < 0 ? mod - 1 - (-(x + 1) % mod) : x % mod) {}
constexpr u32& value() noexcept { return v; }
constexpr const u32& value() const noexcept { return v; }
constexpr modint operator+(const modint& rhs) const noexcept { return modint(*this) += rhs; }
constexpr modint operator-(const modint& rhs) const noexcept { return modint(*this) -= rhs; }
constexpr modint operator*(const modint& rhs) const noexcept { return modint(*this) *= rhs; }
constexpr modint operator/(const modint& rhs) const noexcept { return modint(*this) /= rhs; }
constexpr modint& operator+=(const modint& rhs) noexcept {
v += rhs.v;
if (v >= mod) v -= mod;
return *this;
}
constexpr modint& operator-=(const modint& rhs) noexcept {
if (v < rhs.v) v += mod;
v -= rhs.v;
return *this;
}
constexpr modint& operator*=(const modint& rhs) noexcept {
v = (u64)v * rhs.v % mod;
return *this;
}
constexpr modint& operator/=(const modint& rhs) noexcept { return *this *= rhs.pow(mod - 2); }
constexpr modint pow(u64 exp) const noexcept {
modint self(*this), res(1);
while (exp > 0) {
if (exp & 1) res *= self;
self *= self;
exp >>= 1;
}
return res;
}
constexpr modint& operator++() noexcept {
if (++v == mod) v = 0;
return *this;
}
constexpr modint& operator--() noexcept {
if (v == 0) v = mod;
return --v, *this;
}
constexpr modint operator++(int) noexcept {
modint t = *this;
return ++*this, t;
}
constexpr modint operator--(int) noexcept {
modint t = *this;
return --*this, t;
}
constexpr modint operator-() const noexcept { return modint(mod - v); }
template <class T> friend constexpr modint operator+(T x, modint y) noexcept { return modint(x) + y; }
template <class T> friend constexpr modint operator-(T x, modint y) noexcept { return modint(x) - y; }
template <class T> friend constexpr modint operator*(T x, modint y) noexcept { return modint(x) * y; }
template <class T> friend constexpr modint operator/(T x, modint y) noexcept { return modint(x) / y; }
constexpr bool operator==(const modint& rhs) const noexcept { return v == rhs.v; }
constexpr bool operator!=(const modint& rhs) const noexcept { return v != rhs.v; }
constexpr bool operator!() const noexcept { return !v; }
friend istream& operator>>(istream& s, modint& rhs) noexcept {
i64 v;
rhs = modint{(s >> v, v)};
return s;
}
friend ostream& operator<<(ostream& s, const modint& rhs) noexcept { return s << rhs.v; }
};
/**
* @brief combination
* @docs docs/combinatorics/combination.md
*/
template <class M> struct Combination {
vector<M> _fac, _inv, _finv;
Combination(int n) : _fac(n + 1), _inv(n + 1), _finv(n + 1) {
_fac[0] = _finv[n] = _inv[0] = 1;
for (int i = 1; i <= n; i++) _fac[i] = _fac[i - 1] * i;
_finv[n] /= _fac[n];
for (int i = n - 1; i >= 0; i--) _finv[i] = _finv[i + 1] * (i + 1);
for (int i = 1; i <= n; i++) _inv[i] = _finv[i] * _fac[i - 1];
}
M fac(int k) const { return _fac[k]; }
M finv(int k) const { return _finv[k]; }
M inv(int k) const { return _inv[k]; }
M P(int n, int r) const {
if (n < 0 || r < 0 || n < r) return 0;
return _fac[n] * _finv[n - r];
}
M C(int n, int r) const {
if (n < 0 || r < 0 || n < r) return 0;
return _fac[n] * _finv[r] * _finv[n - r];
}
};
const int INF = 1e9;
const long long IINF = 1e18;
const int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
const char dir[4] = {'D', 'R', 'U', 'L'};
const long long MOD = 1000000007;
// const long long MOD = 998244353;
using mint = modint<MOD>;
const int MAX_H = 400010;
Combination<mint> COM(MAX_H);
void solve() {
int H, W;
cin >> H >> W;
mint ans = COM.C(H + W - 4, H - 2) * (H + W - 3) * 2;
cout << ans << '\n';
}
int main() {
cin.tie(0);
ios::sync_with_stdio(false);
int T;
cin >> T;
for (; T--;) solve();
return 0;
}
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