import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int T=sc.nextInt(); for(int j=0;j<T;j++){ int p=0; int a=sc.nextInt(); int q[]=new int[a]; int w[]=new int[a]; for(int i=0;i<a;i++){ q[i]=sc.nextInt(); w[i]=sc.nextInt(); } double e=w[a-1]; int c=(int) Math.ceil(e/a); for(int i=0;i<a;i++){ if(q[i]>=i*c&&w[i]<=(i+1)*c) p++; } if(p==a) System.out.println("YES"); else System.out.println("NO"); } } } |
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