CodeForces 268A Games

水题一枚。。。

#include <iostream>#include <cstdio>#include <cstring>using namespace std;int main(){    int n,i,ans,j,cnt[200],a[200],b[200];    scanf("%d",&n);    memset(cnt,0,sizeof(cnt));    for (i=0; i<n; i++)    {        scanf("%d%d",a+i,b+i);    }    ans=0;    for (i=0; i<n; i++)    {        for (j=0; j<n; j++)        {            if (a[i] == b[j])                ans++;        }    }    printf("%d\n",ans);}