#include<stdio.h> int ifjumpsuccess(int,int,int); int comparemaxpace(int); int max=0; int main(){ int T; int n; int l, r; int i; scanf("%d",&T); while(T>0){ scanf("%d",&n); for(int m=n;m>0;m--){ scanf("%d%d",&l,&r); i=r-l; max=comparemaxpace(i); } if(ifjumpsuccess(max,r,n)==1){ printf("YES"); } else{ printf("NO"); } T--; } return 0; } int ifjumpsuccess(int maxpace,int endpace,int n){ float i; i=endpace/n; if(maxpace<=i){ return 1; } else{ return 0; } } int comparemaxpace(int a){ if(a>max){ return a; } else return max; } |
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