import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
import java.util.List;
import java.util.Arrays;
public class Main {
    //Program start

    //Program end

    @Test
public void test1() {
    assertEquals(true, checkXMatrix(Arrays.asList(Arrays.asList(2,0,0,1),Arrays.asList(0,3,1,0),Arrays.asList(0,5,2,0),Arrays.asList(4,0,0,2))));
}
@Test
public void test2() {
    assertEquals(false, checkXMatrix(Arrays.asList(Arrays.asList(5,7,0),Arrays.asList(0,3,1),Arrays.asList(0,5,0))));
}

}