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Cod sursa(job #27565)
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define nmax 4112
#define mmax 65536
int n,m,i,j,a[mmax],b[mmax],k,sol;
char adj[nmax][nmax/8],x;
int nr[256];
int main()
{
freopen("triplete.in","r",stdin);
freopen("triplete.out","w",stdout);
scanf("%d%d",&n,&m);
for (i=0;i<m;i++)
{
scanf("%d%d",a+i,b+i);
--a[i],--b[i];
adj[a[i]][b[i]/8]|=1<<b[i]%8;
adj[b[i]][a[i]/8]|=1<<a[i]%8;
}
memset(nr,0,sizeof(nr));
for (x=0;x<256;x++)
{
if (x&1) ++nr[i];
if (x&2) ++nr[i];
if (x&4) ++nr[i];
if (x&8) ++nr[i];
if (x&16) ++nr[i];
if (x&32) ++nr[i];
if (x&64) ++nr[i];
if (x&128) ++nr[i];
}
for (i=0;i<m;i++)
{
for (j=0;j<=n/8+1;j++)
{
x=adj[a[i]][j]&adj[b[i]][j];
sol+=nr[x];
/* if (x&1) ++sol;
if (x&2) ++sol;
if (x&4) ++sol;
if (x&8) ++sol;
if (x&16) ++sol;
if (x&32) ++sol;
if (x&64) ++sol;
if (x&128) ++sol;*/
}
}
printf("%d\n",sol/3);
return 0;
}