Submission #864609

#TimeUsernameProblemLanguageResultExecution timeMemory
864609vnm06Duathlon (APIO18_duathlon)C++14
0 / 100
1063 ms21236 KiB
#include<bits/stdc++.h> #define endl '\n' using namespace std; long long n, m, en; vector<int> gr[300005]; long long ans=0; int post[3005]; int vzm[3005]; void dfs(int v) { post[v]=1; int brs=gr[v].size(); for(int i=0; i<brs; i++) { int nv=gr[v][i]; if(post[nv]==1) continue; if(vzm[nv]==1) {vzm[v]=1; continue;} if(post[nv]) continue; dfs(nv); } post[v]=2; } int main() { ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin>>n>>m; for(int i=0; i<m; i++) { int v, u; cin>>v>>u; gr[v].push_back(u); gr[u].push_back(v); } for(int i=1; i<=n; i++) { for(int j=1; j<=n; j++) { if(i==j) continue; en=j; post[en]=2; vzm[en]=1; dfs(i); for(int k=1; k<=n; k++) { if(k==i || k==j) continue; ans+=vzm[k]; post[k]=vzm[k]=0; } } } cout<<ans<<endl; return 0; } /** 8 7 1 2 2 3 2 4 3 5 5 6 6 7 6 8 */
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