Lang:G++
Edit1234567891011121314151617181920212223242526272829#include<iostream>#include<cstdio>const int Max=100000+50;using namespace std;int b[Max];int c[Max];int main(){//freopen("data.in","r",stdin);//freopen("data.out","w",stdout);int n,a,d;scanf("%d",&n);for(int i=1;i<=n;i++){scanf("%d%d",&a,&d);b[i]=a-d;c[i]=d-a;}int sum=0;for(int i=1;i<=n;i++){for(int j=i+1;j<=n;j++)if(b[i]==c[j])sum++;}printf("%d\n",sum);return 0;}