UVA - 10363 - Tic Tac Toe

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer();
        int cases = Integer.parseInt(br.readLine().trim());
        for (int i = 0; i < cases; i++) {
            if (i > 0) {
                br.readLine();
            }
            int counterX = 0, counterO = 0;
            String str = "";
            boolean[][] arrX = new boolean[3][3];
            boolean[][] arrO = new boolean[3][3];
            for (int j = 0; j < 3; j++) {
                str = br.readLine();
                for (int z = 0; z < 3; z++) {
                    if (str.charAt(z) == 'X') {
                        counterX++;
                        arrX[j][z] = true;
                    }
                    if (str.charAt(z) == 'O') {
                        counterO++;
                        arrO[j][z] = true;
                    }
                }
            }
            if (win(arrX) && win(arrO)) {
                sb.append("no\n");
            }else if (win(arrO) &&counterX!=counterO) {
                sb.append("no\n");
            }else if (win(arrX) &&counterX!=counterO+1) {
                sb.append("no\n");
            }else {
                if (counterO == counterX) {
                    sb.append("yes\n");
                } else if (counterO + 1 == counterX) {
                    sb.append("yes\n");
                } else {
                    sb.append("no\n");
                }
            }
        }
        System.out.print(sb);
    }

    static boolean win(boolean[][] arr) {
        for (int i = 0; i < 3; i++) {
            boolean flag = true;
            for (int j = 0; j < 3; j++) {
                flag &= arr[i][j];
            }
            if (flag) {
                return true;
            }
        }
        for (int i = 0; i < 3; i++) {
            boolean flag = true;
            for (int j = 0; j < 3; j++) {
                flag &= arr[j][i];
            }
            if (flag) {
                return true;
            }
        }
        if (arr[0][0] && arr[1][1] && arr[2][2]) {
            return true;
        }
        if (arr[2][0] && arr[1][1] && arr[0][2]) {
            return true;
        }
        return false;
    }
}