結果

問題 No.1075 木の上の山
ユーザー jelljell
提出日時 2020-06-05 22:59:41
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 44 ms / 2,000 ms
コード長 17,074 bytes
コンパイル時間 3,769 ms
コンパイル使用メモリ 233,480 KB
最終ジャッジ日時 2025-01-10 22:54:45
ジャッジサーバーID
(参考情報)
judge4 / judge5
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 * 2
other AC * 30
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

#pragma region preprocessor
#ifdef LOCAL
//*
#define _GLIBCXX_DEBUG // gcc
/*/
#define _LIBCPP_DEBUG 0 // clang
//*/
#define __clock__
// #define __buffer_check__
#else
#pragma GCC optimize("Ofast")
// #define __buffer_check__
// #define NDEBUG
#endif
#define __precision__ 15
#define iostream_untie true
#include <bits/stdc++.h>
#include <ext/rope>
#define __all(v) std::begin(v), std::end(v)
#define __rall(v) std::rbegin(v), std::rend(v)
#define __popcount(n) __builtin_popcountll(n)
#define __clz32(n) __builtin_clz(n)
#define __clz64(n) __builtin_clzll(n)
#define __ctz32(n) __builtin_ctz(n)
#define __ctz64(n) __builtin_ctzll(n)
#ifdef __clock__
#include "clock.hpp"
#else
#define build_clock() ((void)0)
#define set_clock() ((void)0)
#define get_clock() ((void)0)
#endif
#ifdef LOCAL
#include "dump.hpp"
#define mesg(str) std::cerr << "[ " << __LINE__ << " : " << __FUNCTION__ << " ] " << str << "\n"
#else
#define dump(...) ((void)0)
#define mesg(str) ((void)0)
#endif
#pragma endregion // preprocessor
#pragma region std-overload
namespace std
{
// hash
template <class T> size_t hash_combine(size_t seed, T const &key) { return seed ^ (hash<T>()(key) + 0x9e3779b9 + (seed << 6) + (seed >> 2)); }
template <class T, class U> struct hash<pair<T, U>> { size_t operator()(pair<T, U> const &pr) const { return hash_combine(hash_combine(0, pr
        .first), pr.second); } };
template <class tuple_t, size_t index = tuple_size<tuple_t>::value - 1> struct tuple_hash_calc { static size_t apply(size_t seed, tuple_t const
        &t) { return hash_combine(tuple_hash_calc<tuple_t, index - 1>::apply(seed, t), get<index>(t)); } };
template <class tuple_t> struct tuple_hash_calc<tuple_t, 0> { static size_t apply(size_t seed, tuple_t const &t) { return hash_combine(seed, get
        <0>(t)); } };
template <class... T> struct hash<tuple<T...>> { size_t operator()(tuple<T...> const &t) const { return tuple_hash_calc<tuple<T...>>::apply(0, t
        ); } };
// iostream
template <class T, class U> istream &operator>>(istream &is, pair<T, U> &p) { return is >> p.first >> p.second; }
template <class T, class U> ostream &operator<<(ostream &os, const pair<T, U> &p) { return os << p.first << ' ' << p.second; }
template <class tuple_t, size_t index> struct tupleis { static istream &apply(istream &is, tuple_t &t) { tupleis<tuple_t, index - 1>::apply(is, t
        ); return is >> get<index>(t); } };
template <class tuple_t> struct tupleis<tuple_t, SIZE_MAX> { static istream &apply(istream &is, tuple_t &t) { return is; } };
template <class... T> istream &operator>>(istream &is, tuple<T...> &t) { return tupleis<tuple<T...>, tuple_size<tuple<T...>>::value - 1>::apply
        (is, t); }
template <> istream &operator>>(istream &is, tuple<> &t) { return is; }
template <class tuple_t, size_t index> struct tupleos { static ostream &apply(ostream &os, const tuple_t &t) { tupleos<tuple_t, index - 1>::apply
        (os, t); return os << ' ' << get<index>(t); } };
template <class tuple_t> struct tupleos<tuple_t, 0> { static ostream &apply(ostream &os, const tuple_t &t) { return os << get<0>(t); } };
template <class... T> ostream &operator<<(ostream &os, const tuple<T...> &t) { return tupleos<tuple<T...>, tuple_size<tuple<T...>>::value - 1
        >::apply(os, t); }
template <> ostream &operator<<(ostream &os, const tuple<> &t) { return os; }
template <class Container, typename Value = typename Container::value_type, enable_if_t<!is_same<decay_t<Container>, string>::value, nullptr_t> =
        nullptr>
istream& operator>>(istream& is, Container &cont) { for(auto&& e : cont) is >> e; return is; }
template <class Container, typename Value = typename Container::value_type, enable_if_t<!is_same<decay_t<Container>, string>::value, nullptr_t> =
        nullptr>
ostream& operator<<(ostream& os, const Container &cont) { bool flag = 1; for(auto&& e : cont) flag ? flag = 0 : (os << ' ', 0), os << e; return
        os; }
} // namespace std
#pragma endregion // std-overload
#pragma region executive-setting
namespace setting
{
using namespace std;
using namespace chrono;
system_clock::time_point start_time, end_time;
long long get_elapsed_time() { end_time = system_clock::now(); return duration_cast<milliseconds>(end_time - start_time).count(); }
void print_elapsed_time() { cerr << "\n----- Exec time : " << get_elapsed_time() << " ms -----\n\n"; }
void buffer_check() { char bufc; if(cin >> bufc) cerr << "\n\033[1;35mwarning\033[0m: buffer not empty.\n"; }
struct setupper
{
setupper()
{
if(iostream_untie) ios::sync_with_stdio(false), cin.tie(nullptr);
cout << fixed << setprecision(__precision__);
#ifdef stderr_path
freopen(stderr_path, "a", stderr);
#endif
#ifdef LOCAL
cerr << fixed << setprecision(__precision__) << boolalpha << "\n----- stderr at LOCAL -----\n\n";
#endif
#ifdef __clock__
start_time = system_clock::now();
atexit(print_elapsed_time);
#endif
#ifdef __buffer_check__
atexit(buffer_check);
#endif
}
} __setupper; // struct setupper
} // namespace setting
#pragma endregion // executive-setting
#pragma region fucntion-utility
// lambda wrapper for recursive method.
template <class lambda_type>
class make_recursive
{
lambda_type func;
public:
make_recursive(lambda_type &&f) : func(std::move(f)) {}
template <class... Args> auto operator()(Args &&... args) const { return func(*this, std::forward<Args>(args)...); }
};
template <class T, class... types> T read(types... args) noexcept { typename std::remove_const<T>::type obj(args...); std::cin >> obj; return obj; }
// #define input(type, var, ...) type var{read<type>(__VA_ARGS__)}
// substitute y for x if x > y.
template <class T> inline bool chmin(T &x, const T &y) { return x > y ? x = y, true : false; }
// substitute y for x if x < y.
template <class T> inline bool chmax(T &x, const T &y) { return x < y ? x = y, true : false; }
// binary search on discrete range.
template <class iter_type, class pred_type>
iter_type binary(iter_type __ok, iter_type __ng, pred_type pred)
{
assert(__ok != __ng);
std::ptrdiff_t dist(__ng - __ok);
while(std::abs(dist) > 1)
{
iter_type mid(__ok + dist / 2);
if(pred(mid)) __ok = mid, dist -= dist / 2;
else __ng = mid, dist /= 2;
}
return __ok;
}
// binary search on real numbers.
template <class pred_type>
long double binary(long double __ok, long double __ng, const long double eps, pred_type pred)
{
assert(__ok != __ng);
while(std::abs(__ok - __ng) > eps)
{
long double mid{(__ok + __ng) / 2};
(pred(mid) ? __ok : __ng) = mid;
}
return __ok;
}
// trinary search on discrete range.
template <class iter_type, class comp_type>
iter_type trinary(iter_type __first, iter_type __last, comp_type comp)
{
assert(__first < __last);
std::ptrdiff_t dist(__last - __first);
while(dist > 2)
{
iter_type __left(__first + dist / 3), __right = (__first + dist * 2 / 3);
if(comp(__left, __right)) __last = __right, dist = dist * 2 / 3;
else __first = __left, dist -= dist / 3;
}
if(dist > 1 && comp(next(__first), __first)) ++__first;
return __first;
}
// trinary search on real numbers.
template <class comp_type>
long double trinary(long double __first, long double __last, const long double eps, comp_type comp)
{
assert(__first < __last);
while(__last - __first > eps)
{
long double __left{(__first * 2 + __last) / 3}, __right{(__first + __last * 2) / 3};
if(comp(__left, __right)) __last = __right;
else __first = __left;
}
return __first;
}
// size of array.
template <class A, size_t N> size_t size(A (&array)[N]) { return N; }
// be careful that val is type-sensitive.
template <class T, class A, size_t N> void init(A (&array)[N], const T &val) { std::fill((T*)array, (T*)(array + N), val); }
#pragma endregion // function-utility
#pragma region using-alias
using namespace std;
using i32 = int_least32_t; using i64 = int_least64_t; using u32 = uint_least32_t; using u64 = uint_least64_t;
using p32 = pair<i32, i32>; using p64 = pair<i64, i64>;
template <class T, class Comp = less<T>> using heap = priority_queue<T, vector<T>, Comp>;
template <class T> using hashset = unordered_set<T>;
template <class Key, class Value> using hashmap = unordered_map<Key, Value>;
using namespace __gnu_cxx;
#pragma endregion // using-alias
#pragma region library
#ifndef modint_hpp
#define modint_hpp
#include <cassert>
#include <iostream>
template <int mod>
class modint
{
int val;
public:
static constexpr modint identity() noexcept { return 1; }
constexpr modint() noexcept : val{0} {}
constexpr modint(long long x) noexcept : val((x %= mod) < 0 ? mod + x : x) {}
constexpr long long value() const noexcept { return val; }
constexpr modint operator++(int) noexcept { modint t = *this; return ++val, t; }
constexpr modint operator--(int) noexcept { modint t = *this; return --val, t; }
constexpr modint &operator++() noexcept { return ++val, *this; }
constexpr modint &operator--() noexcept { return --val, *this; }
constexpr modint operator-() const noexcept { return modint(-val); }
constexpr modint &operator+=(const modint &other) noexcept { return (val += other.val) < mod ? 0 : val -= mod, *this; }
constexpr modint &operator-=(const modint &other) noexcept { return (val += mod - other.val) < mod ? 0 : val -= mod, *this; }
constexpr modint &operator*=(const modint &other) noexcept { return val = (long long)val * other.val % mod, *this; }
constexpr modint &operator/=(const modint &other) noexcept { return *this *= inverse(other); }
constexpr modint operator+(const modint &other) const noexcept { return modint(*this) += other; }
constexpr modint operator-(const modint &other) const noexcept { return modint(*this) -= other; }
constexpr modint operator*(const modint &other) const noexcept { return modint(*this) *= other; }
constexpr modint operator/(const modint &other) const noexcept { return modint(*this) /= other; }
constexpr bool operator==(const modint &other) const noexcept { return val == other.val; }
constexpr bool operator!=(const modint &other) const noexcept { return val != other.val; }
constexpr bool operator!() const noexcept { return !val; }
friend constexpr modint operator+(long long x, modint y) noexcept { return modint(x) + y; }
friend constexpr modint operator-(long long x, modint y) noexcept { return modint(x) - y; }
friend constexpr modint operator*(long long x, modint y) noexcept { return modint(x) * y; }
friend constexpr modint operator/(long long x, modint y) noexcept { return modint(x) / y; }
static constexpr modint inverse(const modint &other) noexcept
{
assert(other != 0);
int a{mod}, b{other.val}, u{}, v{1}, t{};
while(b) t = a / b, a ^= b ^= (a -= t * b) ^= b, u ^= v ^= (u -= t * v) ^= v;
return {u};
}
static constexpr modint pow(modint other, long long e) noexcept
{
if(e < 0) e = e % (mod - 1) + mod - 1;
modint res{1};
while(e) { if(e & 1) res *= other; other *= other, e >>= 1; }
return res;
}
friend std::ostream &operator<<(std::ostream &os, const modint &other) noexcept { return os << other.val; }
friend std::istream &operator>>(std::istream &is, modint &other) noexcept { long long val; other = {(is >> val, val)}; return is; }
}; // class modint
template <>
class modint<2>
{
bool val;
public:
static constexpr modint identity() noexcept { return 1; }
constexpr modint(bool x = false) noexcept : val{x} {}
constexpr modint(int x) noexcept : val(x & 1) {}
constexpr modint(long long x) noexcept : val(x & 1) {}
constexpr operator bool() const noexcept { return val; }
constexpr bool value() const noexcept { return val; }
constexpr modint &operator+=(const modint &other) noexcept { return val ^= other.val, *this; }
constexpr modint &operator-=(const modint &other) noexcept { return val ^= other.val, *this; }
constexpr modint &operator*=(const modint &other) noexcept { return val &= other.val, *this; }
constexpr modint &operator/=(const modint &other) noexcept { assert(other.val); return *this; }
constexpr modint operator!() const noexcept { return !val; }
constexpr modint operator-() const noexcept { return *this; }
constexpr modint operator+(const modint &other) const noexcept { return val != other.val; }
constexpr modint operator-(const modint &other) const noexcept { return val != other.val; }
constexpr modint operator*(const modint &other) const noexcept { return val && other.val; }
constexpr modint operator/(const modint &other) const noexcept { assert(other.val); return *this; }
constexpr bool operator==(const modint &other) const noexcept { return val == other.val; }
constexpr bool operator!=(const modint &other) const noexcept { return val != other.val; }
friend constexpr modint operator+(long long x, modint y) noexcept { return x & 1 ? !y : y; }
friend constexpr modint operator-(long long x, modint y) noexcept { return x & 1 ? !y : y; }
friend constexpr modint operator*(long long x, modint y) noexcept { return x & 1 ? y : modint<2>{0}; }
friend constexpr modint operator/(long long x, modint y) noexcept { assert(y.val); return x & 1 ? y : modint<2>{0}; }
friend std::ostream &operator<<(std::ostream &os, const modint &other) noexcept { return os << other.val; }
friend std::istream &operator>>(std::istream &is, modint &other) noexcept { long long val; other.val = (is >> val, val & 1); return is; }
}; // class modint specialization
#endif // modint_hpp
#pragma endregion // library
#pragma region main-code
struct solver; template <class> void main_(); int main() { main_<solver>(); }
template <class solver> void main_()
{
unsigned t = 1;
#ifdef LOCAL
t = 1;
#endif
// t = -1; // infinite loop
// cin >> t; // case number given
while(t--) solver();
}
struct solver
{
solver()
{
using mint=modint<(int)1e9+7>;
int n,k; cin>>n>>k;
vector<vector<int>> T(n);
for(int i=1; i<n; ++i)
{
int u,v; cin>>u>>v; --u,--v;
T[u].emplace_back(v);
T[v].emplace_back(u);
}
vector dp(n,vector<mint>(k,1));
make_recursive(
[&](auto dfs, int now, int pre)->void
{
if(~pre)
{
T[now].erase(find(__all(T[now]),pre));
}
for(int to : T[now])
{
dfs(to, now);
mint acc=0;
for(int i=0; i<k; ++i)
{
acc+=dp[to][i];
dp[now][i]*=acc;
}
}
dump(now, dp[now]);
}
)(0,-1);
mint ans;
make_recursive(
[&](auto dfs, int now, bool roo, vector<mint> anc)->void
{
// add to ans
if(roo)
{
for(int j=0; j<k; ++j)
{
ans+=dp[now][j];
anc[j]=1;
}
anc=vector<mint>(k,1);
}
else
{
mint acc=0;
for(int j=0; j<k; ++j)
{
ans+=dp[now][j]*acc;
acc+=anc[j];
anc[j]=acc;
}
}
dump(now, ans, anc);
// reroot
vector tmp(T[now].size()+1, vector<mint>(k,1));
for(int i=0; i<(int)T[now].size(); ++i)
{
int to=T[now][i];
mint acc=0;
for(int j=0; j<k; ++j)
{
acc+=dp[to][j];
tmp[i+1][j]=tmp[i][j]*acc;
}
}
vector<mint> prod(k,1);
for(int i=T[now].size(); i--; )
{
int to=T[now][i];
vector<mint> nanc(anc);
for(int j=0; j<k; ++j)
{
nanc[j]*=prod[j];
nanc[j]*=tmp[i][j];
}
dfs(to, false, nanc);
mint acc;
for(int j=0; j<k; ++j)
{
acc+=dp[to][j];
prod[j]*=acc;
}
}
}
)(0, true, vector<mint>(k,1));
cout << ans << "\n";
}
};
#pragma endregion // main-code
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