Cod sursa(job #533915)

Utilizator dushmiMihai-Alexandru Dusmanu dushmi Data 14 februarie 2011 20:24:22
Problema Triplete Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.82 kb
#include<cstdio>
int max=1<<11;
int n,nr1[2200],L[4100][410];
long long sol;
void read()
{
    freopen("triplete.in","r",stdin);
    freopen("tripelte.out","w",stdout);
    int m,x,y;
    scanf("%d%d",&n,&m);
    for(int i=1;i<=m;i++)
    {
        scanf("%d%d",&x,&y);
        L[x][y/10]=(L[x][y/10]|(1<<(y%10)));
        L[y][x/10]=(L[y][x/10]|(1<<(x%10)));
    }
}
void init()
{
    for(int i=1;i<max;i++)
        nr1[i]=nr1[i>>1]+(i&1);
}
void solve()
{
    for(int i=1;i<=n;i++)
        for(int j=0;j<=n/10;j++)
            for(int k=1,p=0;k<max;k<<=1,p++)
                if(L[i][j]&k)
                    for(int t=0;t<=n/10;t++)
                        sol+=(long long)nr1[L[i][t]&L[p+j*10][t]];
}
int main()
{
    read();
    init();
    solve();
    printf("%lld",sol/6);
    return 0;
}