Codeforces Beta Round #29 (Div. 2, Codeforces format)

http://codeforces.com/contest/29

A

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 #define lson l,mid,rt<<1
 4 #define rson mid+1,r,rt<<1|1
 5 #define sqr(x) ((x)*(x))
 6 #define pb push_back
 7 #define maxn 1000005
 8 typedef long long ll;
 9 typedef unsigned long long ull;
10 const ull MOD=257;
11 /*#ifndef ONLINE_JUDGE
12         freopen("1.txt","r",stdin);
13 #endif */
14 
15 
16 int main(){
17     #ifndef ONLINE_JUDGE
18       //  freopen("1.txt","r",stdin);
19     #endif
20     std::ios::sync_with_stdio(false);
21     int n;
22     cin>>n;
23     int a[105],b[105];
24     for(int i=1;i<=n;i++){
25         cin>>a[i]>>b[i];
26     }
27     int flag=0;
28     for(int i=1;i<=n;i++){
29         for(int j=1;j<=n;j++){
30             if(i!=j){
31                 if(a[i]+b[i]==a[j]&&a[j]+b[j]==a[i]){
32                     flag=1;
33                 }
34             }
35         }
36     }
37     if(flag) cout<<"YES"<<endl;
38     else cout<<"NO"<<endl;
39 }

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