countNqueen (what is wrong in it)

#1
#2 
import java.util.*;
public class Main {
    public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		boolean[][] arr =new boolean[n][n];
		int store=countIqueen(arr,0);
		System.out.println(store);
    }

	public static int countIqueen(boolean[][] arr,int row  ){
		if(row == arr.length){
			return 1;
		}
		int count=0;
		for(int col=0;col<arr[row].length;col++){
			if(isItSafe(arr,row,col)){
				arr[row][col]=true;
				count=count+countIqueen(arr,row+1);
				arr[row][col]=false;
			}
		}
		return count;

	}

	public static boolean isItSafe(boolean[][] arr, int row, int col){
		//direction:up
        for(int i=row-1;i>=0;i--){
			if(arr[i][col]){
				return false;
			}
		}
		
        //direction:up-east
		for(int i=row-1, j=col+1;i>=0 && j<arr[0].length;i--,j++){
			if(arr[i][j]){
				return false;
			}
		}

        //direction:up-west
		for(int i=row-1, j=col-1;i>=0 && j>=0;i--,j--){
			if(arr[i][j]){
				return false;
			}
		}
		return true;
	}
}
#3

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