#include <cstdio> int main(){ int t; scanf("%d",&t); while(t--){ int n,d; scanf("%d",&n); int l,r; scanf("%d%d",&l,&r); d = r - l; int i; for(i = 1;i < n;i++){ scanf("%d%d",&l,&r); if((r-l) != d) break; } if(i == n) printf("YES\n"); else printf("NO\n"); } return 0; } |
Double click to view unformatted code.