JB TAK FODEGA NHI .... TB TK CHODEGA NHI .... (MAANG)
L17 N-Queens II
The n-queens puzzle is the problem of placing n queens on an n x n chessboard such that no two queens attack each other.
Given an integer n, return the number of distinct solutions to the n-queens puzzle.

Example 1:
Input: n = 4
Output: 2 [There are two distinct solutions to the 4-queens puzzle as shown]
Constraints:
- 1 <= nums.length <= 8
Notes
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