結果
| 問題 |
No.1364 [Renaming] Road to Cherry from Zelkova
|
| コンテスト | |
| ユーザー |
milanis48663220
|
| 提出日時 | 2021-01-22 22:46:56 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
(最新)
AC
(最初)
|
| 実行時間 | - |
| コード長 | 4,869 bytes |
| コンパイル時間 | 1,235 ms |
| コンパイル使用メモリ | 105,568 KB |
| 最終ジャッジ日時 | 2025-01-18 05:09:52 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge3 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 44 WA * 1 |
ソースコード
#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cassert>
#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;
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; }
using namespace std;
typedef long long ll;
const ll MOD = 1000000007;
class ModInt{
public:
ll v;
ModInt(ll _v = 0){
if(_v >= MOD) _v %= MOD;
v = _v;
}
ModInt operator+(ll n){
return ModInt((v+n)%MOD);
}
ModInt operator-(ll n){
return ModInt((v-n+MOD)%MOD);
}
ModInt operator*(ll n){
if(n >= MOD) n %= MOD;
return ModInt((v*n)%MOD);
}
ModInt operator/(ll n){
return ModInt((ModInt(n).inv()*v).v%MOD);
}
void operator+=(ll n){
v = (v+n)%MOD;
}
void operator-=(ll n){
v = (v-n+MOD)%MOD;
}
void operator*=(ll n){
v = (v*n+MOD)%MOD;
}
ModInt operator+(ModInt n){
return ModInt((v+n.v)%MOD);
}
ModInt operator-(ModInt n){
return ModInt((v-n.v+MOD)%MOD);
}
ModInt operator*(ModInt n){
return ModInt((v*n.v)%MOD);
}
ModInt operator/(ModInt n){
return ModInt((n.inv()*v).v%MOD);
}
void operator+=(ModInt n){
v = (v+n.v)%MOD;
}
void operator-=(ModInt n){
v = (v-n.v+MOD)%MOD;
}
void operator*=(ModInt n){
v = (v*n.v)%MOD;
}
void operator=(ModInt n){
v = n.v;
}
bool operator==(ModInt n){
return v == n.v;
}
bool operator!=(ModInt n){
return v != n.v;
}
void operator=(ll n){
v = n;
}
ModInt inv(){
if(v == 1) return ModInt(1);
else return ModInt(MOD-ModInt(MOD%v).inv().v*(MOD/v)%MOD);
}
};
ostream& operator<<(ostream& os, const ModInt& m){
os << m.v;
return os;
}
istream & operator >> (istream &in, ModInt &m){
in >> m.v;
return in;
}
class Scc{
public:
int N;
vector<vector<int>> G;
vector<vector<int>> G_inv;
vector<int> idx;
Scc(int n){
N = n;
G = vector<vector<int>>(n, vector<int>());
G_inv = vector<vector<int>>(n, vector<int>());
used = vector<bool>(n, false);
idx = vector<int>(n);
}
void add_edge(int from, int to){
G[from].push_back(to);
G_inv[to].push_back(from);
}
vector<vector<int>> scc(){
vector<vector<int>> ans;
for(int i = 0; i < N; i++){
if(!used[i]) dfs1(i);
}
clear();
int cur = 0;
for(int i = vs.size()-1; i >= 0; i--){
if(!used[vs[i]]) {
dfs2(vs[i], cur);
cur++;
ans.push_back(buf);
buf.clear();
}
}
return ans;
}
private:
vector<bool> used;
vector<int> vs;
vector<int> buf;
void clear(){
for(int i = 0; i < N; i++) used[i] = false;
}
void dfs1(int v){
used[v] = true;
for(int i = 0; i < G[v].size(); i++){
if(!used[G[v][i]]) dfs1(G[v][i]);
}
vs.push_back(v);
}
void dfs2(int v, int k){
used[v] = true;
idx[v] = k;
for(int i = 0; i < G_inv[v].size(); i++){
if(!used[G_inv[v][i]]) dfs2(G_inv[v][i], k);
}
buf.push_back(v);
}
};
struct edge{
int to;
ModInt l;
int a;
};
ModInt dp_sum[100001];
ModInt dp_cnt[100001];
vector<edge> g[100001];
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout << setprecision(10) << fixed;
int n, m; cin >> n >> m;
Scc scc(n+1);
for(int i = 0; i < m; i++){
int u, v, l, a;
cin >> u >> v >> l >> a;
scc.add_edge(u, v);
g[u].push_back((edge){v, ModInt(l), a});
}
auto v = scc.scc();
vector<int> tsort;
bool started = false;
for(auto u : v){
for(int x : u){
if(x == 0) started = true;
}
if(started && u.size() > 1){
cout << "INF" << endl;
return 0;
}
tsort.push_back(u[0]);
}
dp_cnt[0] = 1;
for(int u : tsort){
for(edge e : g[u]){
dp_cnt[e.to] += dp_cnt[u]*e.a;
dp_sum[e.to] += dp_sum[u]*e.a+e.l*dp_cnt[u]*e.a;
}
}
cout << dp_sum[n] << endl;
}
milanis48663220