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N-Queens 2 - Count number of distinct solutions

hard Solve on LeetCode

Problem
Examples
Solution
Method 1 - Backtracking Using O(N^2) Space Matrix
Code
Method 2 - Backtracking Using O(N) Space Row
Code
Complexity
Method 3 - Backtracking Using Sets for Row and Diagonals
Code
Method 4 - Backtracking Using Boolean Arrays for Col and Diagonals
Code

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