結果
問題 | No.1749 ラムドスウイルスの感染拡大 |
ユーザー |
|
提出日時 | 2021-11-19 22:04:22 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 27 ms / 2,000 ms |
コード長 | 4,653 bytes |
コンパイル時間 | 1,948 ms |
コンパイル使用メモリ | 206,120 KB |
最終ジャッジ日時 | 2025-01-25 20:22:36 |
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 26 |
ソースコード
#line 1 "c.cpp"#pragma region Macros#include <bits/stdc++.h>using namespace std;template <class T> inline bool chmax(T &a, T b) {if(a < b) {a = b;return 1;}return 0;}template <class T> inline bool chmin(T &a, T b) {if(a > b) {a = b;return 1;}return 0;}#ifdef DEBUGtemplate <class T, class U>ostream &operator<<(ostream &os, const pair<T, U> &p) {os << '(' << p.first << ',' << p.second << ')';return os;}template <class T> ostream &operator<<(ostream &os, const vector<T> &v) {os << '{';for(int i = 0; i < (int)v.size(); i++) {if(i) { os << ','; }os << v[i];}os << '}';return os;}void debugg() { cerr << endl; }template <class T, class... Args>void debugg(const T &x, const Args &... args) {cerr << " " << x;debugg(args...);}#define debug(...) \cerr << __LINE__ << " [" << #__VA_ARGS__ << "]: ", debugg(__VA_ARGS__)#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl#else#define debug(...) (void(0))#define dump(x) (void(0))#endifstruct Setup {Setup() {cin.tie(0);ios::sync_with_stdio(false);cout << fixed << setprecision(15);}} __Setup;using ll = long long;#define OVERLOAD3(_1, _2, _3, name, ...) name#define ALL(v) (v).begin(), (v).end()#define RALL(v) (v).rbegin(), (v).rend()#define REP1(i, n) for(int i = 0; i < (n); i++)#define REP2(i, a, b) for(int i = (a); i < int(b); i++)#define REP(...) OVERLOAD3(__VA_ARGS__, REP2, REP1)(__VA_ARGS__)#define UNIQUE(v) sort(ALL(v)), (v).erase(unique(ALL(v)), (v).end())const int INF = 1 << 30;const ll LLINF = 1LL << 60;constexpr int MOD = 1000000007;constexpr int MOD2 = 998244353;const int dx[4] = {1, 0, -1, 0};const int dy[4] = {0, 1, 0, -1};void Case(int i) { cout << "Case #" << i << ": "; }int popcount(int x) { return __builtin_popcount(x); }ll popcount(ll x) { return __builtin_popcountll(x); }#pragma endregion Macros#line 1 "/home/siro53/kyo-pro/compro_library/math/modint.hpp"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.inv();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 inv() 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; }};#line 76 "c.cpp"using mint = ModInt<MOD2>;int main() {int N, M, T;cin >> N >> M >> T;vector<vector<int>> G(N);REP(_, M) {int a, b;cin >> a >> b;G[a].push_back(b);G[b].push_back(a);}vector memo(N, vector<mint>(T+1, 0));vector seen(N, vector<bool>(T+1, false));REP(i, N) seen[i][0] = true;memo[0][0] = 1;auto dp = [&](auto self, int u, int t) -> mint {if(seen[u][t]) return memo[u][t];mint res = 0;for(int v : G[u]) {res += self(self, v, t-1);}seen[u][t] = true;return (memo[u][t] = res);};mint ans = dp(dp, 0, T);cout << ans << endl;}