This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#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(nv==en)
{
for(int j=1; j<=n; j++) if(post[j]) vzm[j]=1;
post[v]=0;
return;
}
else if(!post[nv]) dfs(nv);
}
post[v]=0;
}
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;
for(int k=1; k<=n; k++) vzm[k]=0;
en=j;
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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