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#include<stdio.h> //#include<stdlib.h> int main() { int test,w,minus,a,b,tf=1,fin=0; scanf("%d",&test); while(test--) { scanf("%d",&w); scanf("%d %d",&a,&b); minus=a-b; w--; while(w--) { scanf("%d %d",&a,&b); fin=a-b; if(fin!=minus) tf=0; } if(tf==1) printf("yes\n\n"); else printf("no\n\n"); } //system("pause"); return 0; }
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