#include <bits/stdc++.h> using namespace std; int main(){ int t; cin>>t; while(t--){ int n; cin>>n; int trap[1001][2]; int maxi = 0; for(int i=0; i<n; i++){ cin>>trap[i][0]>>trap[i][1]; if(trap[i][1]-trap[i][0]>maxi) { maxi = trap[i][1]-trap[i][0]; } } int f= 1; for(int i=0; i<n; i++){ if(trap[i][0]+maxi> trap[i][1]){ f = 0; } } if(f){ cout<<"YES"<<endl; } else{ cout<<"NO"<<endl; } } return 0; } |
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