Let’s understand two approaches for solving this Hard leetcode Problem:- Approach 1: Using Branch and Bound //Using Branch and Bound Technique
class Solution {
public:
void solveNQueensHelper(int n, int row, vector<vector<string>>& output, bool* cols, bool* diag1, bool* diag2, vector<string> smallOutput){
//Base Case
if(row == n){
output.push_back(smallOutput);
return;
}
//Traversing the…