이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#pragma GCC optimize("O3,Ofast,unroll-loops")
#pragma GCC target("avx2,bmi")
#include <bits/stdc++.h>
#define lli long long int
#define ld long double
#define pb push_back
#define MP make_pair
#define REP(i, n) for(int i = 0; (i) < (n); (i)++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
using namespace std;
void fastio() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
}
const int N = 55;
const int INF = 1e9 + 500;
int n, m;
array<vector<int>, N> adj;
array<int, N> vis;
inline bool dfs(int node, int l, int t) {
if(l == node) return 0;
if(node == t) return 1;
vis[node] = 1;
for(auto c : adj[node]) {
if(vis[c]) continue;
if(dfs(c, l, t)) {
return 1;
}
}
return 0;
}
void solve() {
cin >> n >> m;
REP(i, m) {
int u, v;
cin >> u >> v;
adj[u].pb(v);
adj[v].pb(u);
}
int ans = 0;
for(int i = 1; i<=n; i++) {
for(int j = 1; j <= n; j++) {
for(int k = 1; k <= n; k++) {
if(i == j || j == k || i == k) continue;
bool f = 1;
for(int l = 1; l <= n; l++) {
if(l == j) continue;
fill(vis.begin(), vis.begin() + n + 1, 0);
if(dfs(i, l, j)) continue;
fill(vis.begin(), vis.begin() + n + 1, 0);
if(dfs(k, l, j)) continue;
f = 0;
break;
}
ans += f;
}
}
}
cout << ans << "\n";
}
signed main() {
fastio();
solve();
}
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