Cod sursa(job #1762777)
Utilizator | Data | 24 septembrie 2016 09:20:27 | |
---|---|---|---|
Problema | Triplete | Scor | 90 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.6 kb |
#include <bits/stdc++.h>
using namespace std;
ifstream fin("triplete.in");
ofstream fout("triplete.out");
bitset<4100>a[4100];
int n,m,b[65540],c[65540];
void Citire()
{
int i,x,y;
fin>>n>>m;
for(i=1;i<=m;i++)
{
fin>>b[i]>>c[i];
x=b[i];
y=c[i];
if(x>y)
swap(x,y);
a[x][y]=1;
}
}
void Rezolvare()
{
int i,x,y,sol=0;
for(i=1;i<=m;i++)
{
x=b[i];
y=c[i];
sol+=(a[x]&a[y]).count();
}
fout<<sol<<"\n";
}
int main()
{
Citire();
Rezolvare();
return 0;
}