import java.util.Scanner; class Trap { private int A, B; public int getA() { return A; } public void setA(int a) { A = a; } public int getB() { return B; } public void setB(int b) { B = b; } } public class Main { static Scanner in = new Scanner(System.in); public static boolean judge(Trap[] tra) { int flag = tra[0].getB() - tra[0].getA(); for (int i = 0; i < tra.length; i++) { if(flag!=tra[i].getB()-tra[i].getA()){ return false; } } return true; } public static void main(String[] args) { int T = in.nextInt(); while (T-- > 0) { int N = in.nextInt(); Trap[] tra = new Trap[N]; for (int i = 0; i < N; i++) { tra[i] = new Trap(); tra[i].setA(in.nextInt()); tra[i].setB(in.nextInt()); } if(judge(tra)){ System.out.println("YES"); }else System.out.println("NO"); } } } |
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