摘要：
52. N-Queens II 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 intege 阅读全文
摘要：
51. N-Queens 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 阅读全文