WA求助

#include<bits/stdc++.h>
using namespace std;
map<int,int>a;
int x[105],y[105];
int main()
{
    int n,i,t;
    cin>>n;
    for(i=1;i<=n;++i)
    {
        cin>>x[i]>>y[i];
        a[x[i]]=1;
    }
    for(i=1;i<=n;++i)
    {
        t=x[i]+y[i];
        if(a.find(t)!=a.end()) 
        {
        	cout<<"YES";
            return 0;
        }
    }
    cout<<"NO";
    return 0;
}