#include <bits/stdc++.h>
using namespace std;
int arr[100000],brr[100000];
int main(){
int n;
cin>>n;
memset(arr,1,sizeof(arr));
for(int i=1;i<=n;i++){
cin>>arr[i]>>brr[i];
if(arr[i]==0 && brr[i]==0){
}
}
return 0;
}
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