結果

問題 No.1227 I hate ThREE
ユーザー masayoshi361masayoshi361
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
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 * 3
other AC * 33
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

/* #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>
// types
using 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 template
template <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;
// library
const 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);
}
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