Help me in solving ADJSUMPAR problem

help
,
1

My issue

My code

import java.util.*;

class Codechef {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int t = in.nextInt();

        while (t-- > 0) {
            int n = in.nextInt();

            int[] b = new int[n];
            for (int i = 0; i < n; i++) {
                b[i] = in.nextInt();
            }

            boolean possible = true;

            for (int i = 0; i < n; i++) {
                int a1 = b[i];
                int a2 = b[(i + 1) % n];
                int expectedSum = (a1 + a2) % 2;

                if (expectedSum != b[i]) {
                    possible = false;
                    break;
                }
            }

            if (possible) {
                System.out.println("YES");
            } else {
                System.out.println("NO");
            }
        }
    }
}

Problem Link: ADJSUMPAR Problem - CodeChef