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