View Code of Problem 6

#include<iostream>
using namespace std;
int main(){
	int t;
	cin>>t;
	while(t--){
		int n,a[50000],b[50000],max=-1,flag=1;
		cin>>n;
		for(int i=0;i<n;i++){
			cin>>a[i]>>b[i];
			if(b[i]-a[i]>max){
				max=b[i]-a[i];
			}
		}
		for(int i=0;i<n-1;i++){
			if(a[i+1]-a[i]<max){
				flag=0;
				break;
			}else{
				flag=1;
			}
		}
		if(flag==0)cout<<"NO"<<endl;
		else cout<<"YES"<<endl;
		
	}
	
	return 0;
}