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摘要： Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct solutions. 思路： 典型8皇后，回溯法，验证是否能放皇后位置， 阅读全文

摘要： 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 阅读全文