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Cod sursa(job #942733)
#include<cstdio>
#include<vector>
using namespace std;
int sf,n,m,i,x1,y1,j,k,nrb[1027],pr[5000],su[5000];
long long nr;
unsigned int a[4096][170];
vector < int > v[4099];
vector < int >::iterator it;
void bag(int x,int y)
{
a[x][su[y]]|=(1LL<<(pr[y]));
if(y>x) v[x].push_back(y);
}
int nrbb(long long val)
{
int s=0;
while(val)
{
s+=nrb[val&1023];
val>>=10;
}
return s;
}
int main()
{
freopen("triplete.in","r",stdin);
freopen("triplete.out","w",stdout);
scanf("%d",&n);
scanf("%d",&m);
for(i=1;i<=n;i++)
{
su[i]=i/30;
pr[i]=i%30;
}
for(i=1;i<=m;i++)
{
scanf("%d",&x1);
scanf("%d",&y1);
bag(x1,y1);
bag(y1,x1);
}
for(i=1;i<=(1<<10);i++)
{
if(i&1) nrb[i]=nrb[i>>1]+1;
else nrb[i]=nrb[i>>1];
}
sf=n/30;
if(n%30!=0) sf++;
for(i=1;i<=n;i++)
for(it=v[i].begin();it!=v[i].end();it++)
{
for(k=sf;k>=0;k--)
nr+=nrbb(a[i][k]&a[*it][k]);
}
printf("%lld\n",nr/3);
return 0;
}