結果
| 問題 | No.329 全射 |
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2016-06-22 07:04:09 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.89.0) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 3,575 bytes |
| 記録 | |
| コンパイル時間 | 2,002 ms |
| コンパイル使用メモリ | 183,304 KB |
| 実行使用メモリ | 10,532 KB |
| 最終ジャッジ日時 | 2024-10-11 19:15:07 |
| 合計ジャッジ時間 | 6,212 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 10 TLE * 1 -- * 29 |
ソースコード
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
template<int MOD>
class ModInt{
public:
ModInt():value(0){}
ModInt(int val):value(val<0?MOD+val%MOD:val%MOD){ }
ModInt& operator+=(ModInt that){
value = value+that.value;
if(value>=MOD)value-=MOD;
return *this;
}
ModInt& operator-=(ModInt that){
value -= that.value;
if(value<0)value+=MOD;
return *this;
}
ModInt& operator*=(ModInt that){
value = (int)((long long)value * that.value % MOD);
return *this;
}
ModInt &operator/=(ModInt that){
return *this *= that.inverse();
}
ModInt operator+(ModInt that) const{
return ModInt(*this)+=that;
}
ModInt operator-(ModInt that) const{
return ModInt(*this)-=that;
}
ModInt operator*(ModInt that) const{
return ModInt(*this)*=that;
}
ModInt operator/(ModInt that) const {
return ModInt(*this) /= that;
}
ModInt operator^(long long k) const{
ModInt n = *this, res = 1;
while(k){
if(k & 1)res *= n;
n *= n;
k >>= 1;
}
return res;
}
ModInt inverse() const {
long long a = value, b = MOD, u = 1, v = 0;
while(b) {
long long t = a / b;
a -= t * b;
swap(a, b);
u -= t * v;
swap(u, v);
}
return ModInt((int)u);
}
int toi() const{ return value; }
private:
int value;
};
typedef ModInt<1000000007> mint;
ostream& operator<<(ostream& os, const mint& x){
os << x.toi();
return os;
}
template <class Val>
vector<Val> factorials(int n){
vector<Val> res(n + 1);
res[0] = res[1] = 1;
for(int i = 2; i <= n; ++i)
res[i] = res[i - 1] * i;
return res;
}
mint nCr(int n, int r, const vector<mint> &fact){
return fact[n] / (fact[r] * fact[n - r]);
}
mint countSurjectiveFunctions(int n, int k, const vector<mint> &fact){
mint res = 0;
for(int i = 1; i <= k; ++i){
mint d = nCr(k, i, fact);
d *= (mint(i)^n);
if((k - i) % 2)d *= -1;
res += d;
}
return res;
}
mint solve(vector<vector<int>> G, vi &num, vector<mint> &fact){
int V = (int)G.size();
mint res = 0;
for(int u = 0; u < V; ++u){
priority_queue<pii> que;
vi vis(V);
que.push(mp(num[u], u));
while(que.size()){
int mini, v;
tie(mini, v) = que.top();
que.pop();
if(vis[v]++)continue;
if(mini >= num[v])res += countSurjectiveFunctions(num[u], num[v], fact);
for(int w : G[v])if(!vis[w])
que.push(mp(min(mini, num[v]), w));
}
}
return res;
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
int N, M;
auto fact = factorials<mint>(1000);
cin >> N >> M;
vi w(N);
rep(i, N)cin >> w[i];
vector<vi> G(N);
rep(i, M){
int u, v;
cin >> u >> v;
--u;
--v;
G[u].push_back(v);
}
cout << solve(G, w, fact) << endl;
}