結果
| 問題 |
No.1364 [Renaming] Road to Cherry from Zelkova
|
| コンテスト | |
| ユーザー |
lorent_kyopro
|
| 提出日時 | 2021-01-23 00:45:54 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 4,411 bytes |
| コンパイル時間 | 2,425 ms |
| コンパイル使用メモリ | 217,472 KB |
| 最終ジャッジ日時 | 2025-01-18 06:59:23 |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 24 WA * 21 |
ソースコード
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (int)n; ++i)
#define rrep(i, n) for (int i = (int)n - 1; i >= 0; --i)
#define ALL(v) v.begin(), v.end()
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
const array<string, 2> YESNO = {"NO", "YES"};
const array<string, 2> YesNo = {"No", "Yes"};
const array<string, 2> yesno = {"no", "yes"};
void YES(bool b = true) { cout << YESNO[b] << '\n'; }
void Yes(bool b = true) { cout << YesNo[b] << '\n'; }
void yes(bool b = true) { cout << yesno[b] << '\n'; }
template<typename T, typename U>
inline bool chmax(T& a, const U& b) {
if (a < b){
a = b;
return true;
}
return false;
}
template<typename T, typename U>
inline bool chmin(T& a, const U& b) {
if (a > b) {
a = b;
return true;
}
return false;
}
template<typename T>
void UNIQUE(vector<T>& v) {
sort(v.begin(), v.end());
v.erase(unique(v.begin(), v.end()));
}
template<typename T>
int lb(const vector<T> v, T x) {
return distance(v.begin(), lower_bound(v.begin(), v.end(), x));
}
template<typename T>
int ub(const vector<T> v, T x) {
return distance(v.begin(), upper_bound(v.begin(), v.end(), x));
}
/**
* @brief 多次元 vector の作成
* @author えびちゃん
*/
namespace detail {
template<typename T, int N>
auto make_vec(vector<int>& sizes, T const& x) {
if constexpr (N == 1) {
return vector(sizes[0], x);
} else {
int size = sizes[N-1];
sizes.pop_back();
return vector(size, make_vec<T, N-1>(sizes, x));
}
}
}
template<typename T, int N>
auto make_vec(int const(&sizes)[N], T const& x = T()) {
vector<int> s(N);
for (int i = 0; i < N; ++i) s[i] = sizes[N-i-1];
return detail::make_vec<T, N>(s, x);
}
template<typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
for (auto it = v.begin(); it != v.end(); ++it) {
if (it == v.begin()) os << *it;
else os << ' ' << *it;
}
return os;
}
template<typename T, typename U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
os << p.first << ' ' << p.second;
return os;
}
__attribute__((constructor))
void fast_io() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
}
#include <atcoder/modint>
using namespace atcoder;
using mint = modint1000000007;
// using mint = modint998244353;
int main() {
int n, m;
cin >> n >> m;
auto g = make_vec<tuple<ll, ll, ll>>({n+1, 0});
auto rg = make_vec<tuple<ll, ll, ll>>({n+1, 0});
rep(i, m) {
ll u, v, l, a;
cin >> u >> v >> l >> a;
g[u].eb(v, l, a);
rg[v].eb(u, l, a);
}
vector<bool> ok(n+1), rok(n+1);
auto dfs = [&](auto self, int u) -> void {
ok[u] = true;
for (auto [v, l, a] : g[u]) {
if (ok[v]) continue;
self(self, v);
}
};
auto rdfs = [&](auto self, int u) -> void {
rok[u] = true;
for (auto [v, l, a] : rg[u]) {
if (rok[v]) continue;
self(self, v);
}
};
dfs(dfs, 0);
rdfs(rdfs, n);
if (!(ok[n] && rok[n])) {
cout << 0 << '\n';
return 0;
}
auto ng = make_vec<tuple<ll, ll, ll>>({n+1, 0});
vector<int> in(n+1);
rep(i, n+1) {
if (ok[i] && rok[i]) {
for (auto [v, l, a] : g[i]) {
if (ok[v] && rok[v]) {
ng[i].eb(v, l, a);
in[v]++;
}
}
}
}
queue<int> q;
vector<int> topolo;
rep(i, n+1) if (in[i] == 0) q.push(i), topolo.pb(i);
while (!q.empty()) {
int u = q.front();
q.pop();
for (auto [v, l, a] : g[u]) {
in[v]--;
if (in[v] == 0) {
q.push(v);
topolo.pb(v);
}
}
}
rep(i, n+1) if (in[i] != 0) {
cout << "INF\n";
return 0;
}
vector<pair<mint, mint>> dp(n+1);
dp[0].fi = 1;
for (auto u : topolo) {
for (auto [v, l, a] : g[u]) {
dp[v].fi += dp[u].fi * a;
dp[v].se += (dp[u].se + dp[u].fi * l) * a;
}
}
cout << dp[n].se.val() << '\n';
}
lorent_kyopro