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