# | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
---|---|---|---|---|---|---|---|
945553 | vjudge1 | Amusement Park (CEOI19_amusementpark) | C++17 | 14 ms | 49248 KiB |
이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
//using namespace __gnu_pbds;
bool YES(bool f){ if(f) cout << "Yes\n" ; else cout << "No\n" ; return f ; }
void YES(){YES(1);}
void NO(){YES(0);}
void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
//#define ordered_set tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>
#define ios ios_base::sync_with_stdio(0) ; cin.tie(0) ; cout.tie(0);
#define int long long
#define ld long double
#define pii pair <int , int>
#define all(x) x.begin() , x.end()
#define ff first
#define ss second
#define endl '\n'
const int N = 1e6 + 5 ;
const int inf = 1e16 ;
const int mod = 1e9 + 8 ;
const double eps = 1e-8 ;
template <class T>
bool chmax( T& x , const T& y ){
bool f = 0 ;
if ( x < y ) x = y , f = 1 ;
return f ;
}
template <class T>
bool chmin( T &x , const T &y ){
bool f = 0 ;
if ( x > y ) x = y , f = 1 ;
return f ;
}
//code
int n , m ;
vector <int> g[N] , r[N] ;
vector <pii> vec ;
bool vis[N] , ch[N] ;
bool dfs ( int v ){
vis[v] = 1 , ch[v] = 1 ;
for ( auto to : g[v] ){
if ( ch[to] ) return 1 ;
if ( !vis[to] && dfs(to) ) return 1 ;
} ch[v] = 0 ;
return 0 ;
}
void solve(){
cin >> n >> m ;
for ( int i = 0 ; i < m ; i ++ ){
int x , y ; cin >> x >> y ;
vec.push_back({x,y}) ;
} int ans = 0 ;
for ( int i = 0 ; i < ( 1 << m ) ; i ++ ){
for ( int j = 1 ; j <= n ; j ++ ) g[j].clear() , vis[j] = 0 , ch[j] = 0 ;
for ( int j = 0 ; j < m ; j ++ ){
if ( ( 1 << j ) & i ) g[vec[j].ss].push_back(vec[j].ff) ;
else g[vec[j].ff].push_back(vec[j].ss) ;
}
if ( !dfs(1) ){
int res = 0 ;
for ( int j = 0 ; j < m ; j ++ ) if ( (1<<j)&i ) res ++ ;
ans = (ans+res)%mod ;
}
}
cout << ans ;
}
signed main(){
ios ;
int t = 1 ;
//cin >> t ;
while ( t -- ) solve() ;
}
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