#include <iostream> #include<algorithm> using namespace std; int main() { int t,n,l,r; cin>>t; while(t--) { int f=1; cin>>n; for(int i=1;i<=n;i++) { cin>>l>>r; if(r-l>1) {f=0;break;} } if(f) cout<<"YES"<<endl; else cout<<"NO"<<endl; } return 0; } |
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