N-Queens II
Explore solving the N-Queens II problem by applying backtracking techniques to count all distinct solutions for placing n queens on an n x n chessboard. Understand constraints and logical steps to ensure no two queens attack each other, mastering this classical coding pattern.
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Statement
Given an integer, n, representing the size of an n x n chessboard, return the number of distinct ways to place n queens so that no two queens attack each other. A queen can attack another queen if they are in the same row, column, or diagonal.
Constraints:
n
Examples
Understand the problem
Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:
N-Queens
What is the correct solution to the 1-Queens problem?
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Figure it out!
We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.
Try it yourself
Implement your solution in Solution.java in the following coding playground.
import java.util.*;public class Solution {public static int totalNQueens(int n) {// Replace this placeholder return statement with your codereturn -1;}}