View Code of Problem 6

#include <stdio.h>
int main(int argc, char *argv[])
{
	int t;
	scanf("%d",&t);
	while(t--){
		int n;
		scanf("%d",&n);
		int a[n][2];
		int i,j;
		for(i=0;i<n;i++)
		scanf("%d%d",&a[i][0],&a[i][1]);
	int b[100];
		for(j=0;j<n;j++){
			b[j]=a[j][1]-a[j][0];
		}
		int flag=0;
		for(i=0;i<n-1;i++){
			if((b[i+1]-b[i])!=0)
			flag=1;
		}
		if(flag==0) 
		printf("YES\n");
		else printf("NO\n");
	}
	return 0;
}