The backtrack method checks if the current row is the last row, and if so, adds the current board configuration to the result list. Otherwise, it tries to place a queen in each column of the current row and recursively calls itself.
The solution uses a backtracking approach to place queens on the board. The solveNQueens method initializes the board and calls the backtrack method to start the backtracking process. jav g-queen
Given an integer n , return all possible configurations of the board where n queens can be placed without attacking each other. The backtrack method checks if the current row
public class Solution { public List<List<String>> solveNQueens(int n) { List<List<String>> result = new ArrayList<>(); char[][] board = new char[n][n]; for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { board[i][j] = '.'; } } backtrack(result, board, 0); return result; } The solveNQueens method initializes the board and calls
The space complexity of the solution is O(N^2), where N is the number of queens. This is because we need to store the board configuration and the result list.