```cpp
#include<bits/stdc++.h>
using namespace std;
int x[105],d[105];
int main()
{
//freopen(".in","r",stdin);
//freopen(".out","w",stdout);
int n;
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>x[i]>>d[i];
}
for(int i=1;i<=n;i++)
{
int a=x[i]+d[i],b=INT_MAX/2;
for(int j=1;j<=n;j++)
{
if(a==x[j])
{
b=x[j]+d[j];
}
}
if(b==x[i])
{
cout<<"YES"<<endl;
return 0;
}
}
cout<<"NO"<<endl;
return 0;
}
```
by 陈斯齐 @ 2019-04-09 19:38:59
AC代码
by 陈斯齐 @ 2019-04-09 19:39:09