View Code of Problem 6

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