#include<stdio.h> int main() { int i,j=0,t,n,l[100],r[100],s[100]; scanf("%d",&t); while(t--) { scanf("%d",&n); for (i=0;i<n;i++) scanf("%d%d",&l[i],&r[i]); for (i=0;i<n;i++) s[i]=r[i]-l[i]; for (i=1;i<n;i++) if(s[0]!=s[i]) j=1; if (j==1) printf("NO"); else printf("YES"); printf("\n"); } return 0; } |
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