結果
問題 | No.1227 I hate ThREE |
ユーザー |
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提出日時 | 2020-09-11 23:50:35 |
言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 227 ms / 2,000 ms |
コード長 | 6,283 bytes |
コンパイル時間 | 2,643 ms |
コンパイル使用メモリ | 209,980 KB |
実行使用メモリ | 42,496 KB |
最終ジャッジ日時 | 2025-01-02 05:53:20 |
合計ジャッジ時間 | 7,187 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 33 |
ソースコード
/* #region header */#ifdef LOCAL#include "cxx-prettyprint-master/prettyprint.hpp"#define debug(x) cout << x << endl#else#define debug(...) 42#endif#pragma GCC optimize("Ofast")#include <bits/stdc++.h>// typesusing namespace std;using ll = long long;using ull = unsigned long long;using ld = long double;typedef pair<ll, ll> Pl;typedef pair<int, int> Pi;typedef vector<ll> vl;typedef vector<int> vi;typedef vector<char> vc;template <typename T>using mat = vector<vector<T>>;typedef vector<vector<int>> vvi;typedef vector<vector<long long>> vvl;typedef vector<vector<char>> vvc;template <int mod>struct modint {int x;modint() : x(0) {}modint(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}modint &operator+=(const modint &p) {if ((x += p.x) >= mod) x -= mod;return *this;}modint &operator-=(const modint &p) {if ((x += mod - p.x) >= mod) x -= mod;return *this;}modint &operator*=(const modint &p) {x = (int)(1LL * x * p.x % mod);return *this;}modint &operator/=(const modint &p) {*this *= p.inverse();return *this;}modint operator-() const { return modint(-x); }modint operator+(const modint &p) const { return modint(*this) += p; }modint operator-(const modint &p) const { return modint(*this) -= p; }modint operator*(const modint &p) const { return modint(*this) *= p; }modint operator/(const modint &p) const { return modint(*this) /= p; }bool operator==(const modint &p) const { return x == p.x; }bool operator!=(const modint &p) const { return x != p.x; }modint inverse() const {int a = x, b = mod, u = 1, v = 0, t;while (b > 0) {t = a / b;swap(a -= t * b, b);swap(u -= t * v, v);}return modint(u);}modint pow(int64_t n) const {modint ret(1), mul(x);while (n > 0) {if (n & 1) ret *= mul;mul *= mul;n >>= 1;}return ret;}friend ostream &operator<<(ostream &os, const modint &p) {return os << p.x;}friend istream &operator>>(istream &is, modint &a) {int64_t t;is >> t;a = modint<mod>(t);return (is);}static int get_mod() { return mod; }};// abreviations#define all(x) (x).begin(), (x).end()#define rall(x) (x).rbegin(), (x).rend()#define rep_(i, a_, b_, a, b, ...) for (ll i = (a), max_i = (b); i < max_i; i++)#define rep(i, ...) rep_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)#define rrep_(i, a_, b_, a, b, ...) \for (ll i = (b - 1), min_i = (a); i >= min_i; i--)#define rrep(i, ...) rrep_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)#define SZ(x) ((int)(x).size())#define pb(x) push_back(x)#define eb(x) emplace_back(x)#define mp make_pair#define print(x) cout << x << endl#define vprint(x) \rep(i, x.size()) cout << x[i] << ' '; \cout << endl#define vsum(x) accumulate(all(x), 0LL)#define vmax(a) *max_element(all(a))#define vmin(a) *min_element(all(a))#define lb(c, x) distance((c).begin(), lower_bound(all(c), (x)))#define ub(c, x) distance((c).begin(), upper_bound(all(c), (x)))// functions// gcd(0, x) fails.ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }template <class T>bool chmax(T &a, const T &b) {if (a < b) {a = b;return 1;}return 0;}template <class T>bool chmin(T &a, const T &b) {if (b < a) {a = b;return 1;}return 0;}template <typename T>T mypow(T x, ll n) {T ret = 1;while (n > 0) {if (n & 1) (ret *= x);(x *= x);n >>= 1;}return ret;}ll modpow(ll x, ll n, const ll mod) {ll ret = 1;while (n > 0) {if (n & 1) (ret *= x);(x *= x);n >>= 1;x %= mod;ret %= mod;}return ret;}template <typename T>uint64_t my_rand(void) {static uint64_t x = 88172645463325252ULL;x = x ^ (x << 13);x = x ^ (x >> 7);return x = x ^ (x << 17);}int popcnt(ull x) { return __builtin_popcountll(x); }// graph templatetemplate <typename T>struct edge {int src, to;T cost;edge(int to, T cost) : src(-1), to(to), cost(cost) {}edge(int src, int to, T cost) : src(src), to(to), cost(cost) {}edge &operator=(const int &x) {to = x;return *this;}bool operator<(const edge<T> &r) const { return cost < r.cost; }operator int() const { return to; }};template <typename T>using Edges = vector<edge<T>>;template <typename T>using WeightedGraph = vector<Edges<T>>;using UnWeightedGraph = vector<vector<int>>;struct Timer {clock_t start_time;void start() { start_time = clock(); }int lap() {// return x ms.return (clock() - start_time) * 1000 / CLOCKS_PER_SEC;}};/* #endregion*/// constant#define inf 1000000005#define INF 8000000004000000000LL#define mod 1000000007LL//#define endl '\n'typedef modint<mod> mint;const long double eps = 0.000000000000001;const long double PI = 3.141592653589793;// libraryconst int mx = 5000;int main() {cin.tie(0);ios::sync_with_stdio(0);cout << setprecision(30);ll n, c;cin >> n >> c;c++;ll m = min(c, (ll)mx);mat<int> g(n);rep(i, n - 1) {int a, b;cin >> a >> b;a--;b--;g[a].pb(b);g[b].pb(a);}mat<int> memo(n, vector<int>(mx * 2 + 5, -1));auto dp = [&](int v, int par, int p, auto dp) {if (p < 1 || p >= c) return (mint)0;if (memo[v][p] >= 0) return (mint)memo[v][p];mint res = 1;for (int nv : g[v]) {if (nv == par) continue;mint tmp = 0;tmp = dp(nv, v, p + 3, dp) + dp(nv, v, p - 3, dp);res *= tmp;}memo[v][p] = res.x;return res;};mint ans = 0;rep(i, m) { ans += dp(0, -1, i, dp); }rep(i, max(c - m, m), c) { ans += dp(0, -1, c - i, dp); }ans += dp(0, -1, mx, dp) * (max(c - mx, m) - m);print(ans);}