View Code of Problem 6

#include <stdio.h>
int main(){
	int t;
	scanf("%d",&t);
	while(t--){
		int n;
		scanf("%d",&n);
		int l[200],r[200],max=0;
		for(int i=0;i<n;i++){
			scanf("%d%d",&l[i],&r[i]);
			if(r[i]-l[i]>max)  max=r[i]-l[i];
		}
		int flag=1;
		for(int i=0;i<n-1;i++){
			if(l[i]+max>l[i+1])  flag=0;
		}
		flag==1?printf("YES\n"):printf("NO\n");
	}
	return 0;
}