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花花酱 LeetCode 51. N-Queens

Problem:

The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other.

Given an integer n, return all distinct solutions to the n-queens puzzle.

Each solution contains a distinct board configuration of the n-queens’ placement, where 'Q' and '.' both indicate a queen and an empty space respectively.

For example,
There exist two distinct solutions to the 4-queens puzzle:

Idea:
Search
Solution:
Changes: 12/20/2017
type of sols_ changed from set<vector<string>> to vector<vector<string>>. Thanks to Yun-Ting Lin.

 

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