A. Games Solution

#include<stdio.h>

int main()

{

    int n,a[35],b[35],count=0,i,j;

    scanf("%d",&n);

    for (i=0;i<n;i++){

        scanf("%d%d",&a[i],&b[i]);

    }

    for (i=0;i<n-1;i++){

        for (j=i;j<n;j++){

            if (a[i]==b[j])

                count++;

            if (b[i]==a[j])

                count++;

        }

    }

    printf("%d\n",count);

    return 0;

}