#include<bits/stdc++.h> using namespace std; int main(){ int t,n,a[100][2],i,j,max=0,x=0; cin>>t; while(t--){ cin>>n; for(i=0;i<n;i++){ cin>>a[i][0]>>a[i][1]; } for(i=0;i<n;i++){ if(max<(a[i][1]-a[i][0])){ max=a[i][1]-a[i][0]; } } for(i=0;i<n-1;i++){ if(a[i][0]+max>a[i+1][0]){ x=1; } } if(x==0){ cout<<"YES"<<endl; } else if(x==1){ cout<<"NO"<<endl; } } return 0; } |
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