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Cod sursa(job #220366)
#include <cstdio>
#include <vector>
using namespace std;
long long n, m;
long long contor;
long long v[4100][140];
typedef struct
{
long long x, y;
} Muchie;
Muchie a[66000];
void citire()
{
freopen("triplete.in","r",stdin);
freopen("triplete.out","w",stdout);
long long i, x, y, g, r;
scanf("%lld %lld",&n, &m);
for (i = 1; i <= m; i++)
{
scanf("%lld %lld", &x, &y);
g = y / 60;
r = y % 60;
v[x][g] += (1<<r);
g = x / 60;
r = x % 60;
v[y][g] += (1<<r);
a[i].x = x; a[i].y = y;
}
}
long long nrb(long long x)
{
long long cnt = 0;
while (x)
{
cnt += (x % 2);
x /= 2;
}
return cnt;
}
int main()
{
citire();
long long i, j;
long long x;
for (i = 1; i <= m; i++)
for (j = 0; j <= n / 60 + 1; j++)
{
x = (v[a[i].x][j] & v[a[i].y][j]);
contor += nrb(x);
}
contor /= 3;
printf("%lld\n",contor);
return 0;
}