{"id":411,"date":"2020-09-26T10:38:30","date_gmt":"2020-09-26T02:38:30","guid":{"rendered":"http:\/\/39.96.58.60\/?p=411"},"modified":"2022-10-18T16:39:24","modified_gmt":"2022-10-18T08:39:24","slug":"leetcode-%e9%9d%a2%e8%af%95%e9%a2%98-08-12-%e5%85%ab%e7%9a%87%e5%90%8e","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=411","title":{"rendered":"Leetcode \u9762\u8bd5\u9898 08.12. \u516b\u7687\u540e"},"content":{"rendered":"<p>\u8bbe\u8ba1\u4e00\u79cd\u7b97\u6cd5\uff0c\u6253\u5370 N \u7687\u540e\u5728 N \u00d7 N \u68cb\u76d8\u4e0a\u7684\u5404\u79cd\u6446\u6cd5\uff0c\u5176\u4e2d\u6bcf\u4e2a\u7687\u540e\u90fd\u4e0d\u540c\u884c\u3001\u4e0d\u540c\u5217\uff0c\u4e5f\u4e0d\u5728\u5bf9\u89d2\u7ebf\u4e0a\u3002\u8fd9\u91cc\u7684\u201c\u5bf9\u89d2\u7ebf\u201d\u6307\u7684\u662f\u6240\u6709\u7684\u5bf9\u89d2\u7ebf\uff0c\u4e0d\u53ea\u662f\u5e73\u5206\u6574\u4e2a\u68cb\u76d8\u7684\u90a3\u4e24\u6761\u5bf9\u89d2\u7ebf\u3002<\/p>\n<p><strong>\u6ce8\u610f\uff1a<\/strong>\u672c\u9898\u76f8\u5bf9\u539f\u9898\u505a\u4e86\u6269\u5c55<\/p>\n<p><strong>\u793a\u4f8b:<\/strong><\/p>\n<pre><strong> \u8f93\u5165<\/strong>\uff1a4\n\n<strong> \u8f93\u51fa<\/strong>\uff1a[[\".Q..\",\"...Q\",\"Q...\",\"..Q.\"],[\"..Q.\",\"Q...\",\"...Q\",\".Q..\"]]\n\n<strong> \u89e3\u91ca<\/strong>: 4 \u7687\u540e\u95ee\u9898\u5b58\u5728\u5982\u4e0b\u4e24\u4e2a\u4e0d\u540c\u7684\u89e3\u6cd5\u3002\n\n[\n\n&nbsp;[\".Q..\", &nbsp;\/\/ \u89e3\u6cd5 1\n\n&nbsp; \"...Q\",\n\n&nbsp; \"Q...\",\n\n&nbsp; \"..Q.\"],\n\n\n\n&nbsp;[\"..Q.\", &nbsp;\/\/ \u89e3\u6cd5 2\n\n&nbsp; \"Q...\",\n\n&nbsp; \"...Q\",\n\n&nbsp; \".Q..\"]\n\n]\n\n<\/pre>\n<p>**\u96be\u5ea6**: Hard<\/p>\n<p>**\u6807\u7b7e**: \u56de\u6eaf\u7b97\u6cd5\u3001<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism undefined-numbers lang-python\" data-lang=\"Python\"><code>\n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a60 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8688.57% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.8 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8622.64% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u56de\u6eaf\n\"\"\"\nclass Solution:\n    def solveNQueens(self, n: int) -&gt; List[List[str]]:\n        col_record = []     # \u5217\u8bb0\u5f55\n        dia1_record = []    # \u5bf9\u89d2\u7ebf1\u8bb0\u5f55\n        dia2_record = []    # \u5bf9\u89d2\u7ebf2\u8bb0\u5f55\n        result = []\n        def backtrack(r, current):\n            if r &gt;= n:  # \u5982\u679c\u6700\u540e\u4e00\u884c\u4e5f\u653e\u7f6e\u5b8c\u6210\uff0c\u5219\u6dfb\u52a0\u5230\u6700\u7ec8\u7ed3\u679c\u4e2d\n                board = [['.' for _ in range(n)] for _ in range(n)]\n                for r,c in current:\n                    board[r][c] = 'Q'\n                    board[r] = ''.join(board[r])\n                result.append(board[:])\n                return\n            for c in range(n):  # \u5728\u672c\u884c\u4e2d\u4f9d\u6b21\u5728\u6bcf\u4e00\u5217\u4e0a\u8fdb\u884c\u653e\u7f6e\n                if c not in col_record and r-c not in dia1_record and r+c not in dia2_record:   # \u67e5\u770b\u662f\u5426\u5df2\u7ecf\u653e\u7f6e\u8fc7\n                    col_record.append(c)\n                    dia1_record.append(r-c)\n                    dia2_record.append(r+c)\n                    backtrack(r+1, current+[(r, c)])    # \u653e\u7f6e\u4e0b\u4e00\u884c\n                    col_record.pop()\n                    dia1_record.pop()\n                    dia2_record.pop()\n        backtrack(0, [])\n        return result<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u8bbe\u8ba1\u4e00\u79cd\u7b97\u6cd5\uff0c\u6253\u5370 N \u7687\u540e\u5728 N \u00d7 N \u68cb\u76d8\u4e0a\u7684\u5404\u79cd\u6446\u6cd5\uff0c\u5176\u4e2d\u6bcf\u4e2a\u7687\u540e\u90fd\u4e0d\u540c\u884c\u3001\u4e0d\u540c\u5217\uff0c\u4e5f\u4e0d\u5728\u5bf9\u89d2\u7ebf\u4e0a\u3002\u8fd9&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/411"}],"collection":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=411"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/411\/revisions"}],"predecessor-version":[{"id":412,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/411\/revisions\/412"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=411"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}