{"id":2861,"date":"2020-02-03T13:59:09","date_gmt":"2020-02-03T05:59:09","guid":{"rendered":"http:\/\/www.sniper97.cn\/?p=2861"},"modified":"2020-02-03T13:59:09","modified_gmt":"2020-02-03T05:59:09","slug":"%e3%80%90leetcode%e3%80%910037-%e8%a7%a3%e6%95%b0%e7%8b%ac","status":"publish","type":"post","link":"http:\/\/www.sniper97.cn\/index.php\/note\/algorithm\/2861\/","title":{"rendered":"\u3010LeetCode\u30110037 \u89e3\u6570\u72ec"},"content":{"rendered":"\n<p><a href=\"https:\/\/leetcode-cn.com\/problems\/sudoku-solver\/\">https:\/\/leetcode-cn.com\/problems\/sudoku-solver\/<\/a><\/p>\n\n\n<pre class=\"wp-block-preformatted\"># -*- coding:utf-8 -*-<em>\n<\/em>class Solution(object):\n    def solveSudoku(self, board):\n        <em>\"\"\"\n        <\/em><strong><em>:type<\/em><\/strong><em> board: List[List[str]]\n        <\/em><strong><em>:rtype<\/em><\/strong><em>: None Do not return anything, modify board in-place instead.\n        \"\"\"\n        <\/em>def check(x, y, s):\n            <em>\"\"\"\n            \u68c0\u67e5\u5f53\u524d\u8f93\u5165\u662f\u5426\u5408\u6cd5\n            <\/em><strong><em>:param<\/em><\/strong><em> x:\n            <\/em><strong><em>:param<\/em><\/strong><em> y:\n            <\/em><strong><em>:param<\/em><\/strong><em> s:\n            <\/em><strong><em>:return<\/em><\/strong><em>:\n            \"\"\"\n            <\/em># \u68c0\u67e5\u6a2a\u7ad6\n            for i in range(9):\n                if board[x][i] == s or board[i][y] == s:\n                    return False\n            # \u68c0\u67e53*3\n            for i in range(3):\n                for j in range(3):\n                    if board[x \/\/ 3 * 3 + i][y \/\/ 3 * 3 + j] == s:\n                        return False\n            return True\n        def find_s(cur_idx):\n            <em>\"\"\"\n            \u56de\u6714\u5bfb\u627e\u5408\u9002\u7684s\n            <\/em><strong><em>:param<\/em><\/strong><em> cur_idx:\n            <\/em><strong><em>:return<\/em><\/strong><em>:\n            \"\"\"\n            <\/em>if cur_idx == 81:\n                return True\n            # \u786e\u5b9ax y\n            x, y = cur_idx \/\/ 9, cur_idx % 9\n            if board[x][y] != '.':\n                return find_s(cur_idx + 1)\n            for i in range(1, 10):\n                str_s = str(i)\n                if check(x, y, str_s):\n                    board[x][y] = str_s\n                    if find_s(cur_idx + 1):\n                        return True\n                    # \u68c0\u67e5\u4e0d\u901a\u8fc7\uff0c\u9700\u8981\u56de\u6714\uff0c\u56e0\u6b64\u5c06\u8fd9\u4e2a\u4f4d\u7f6e\u6062\u590d\u4e3a\u7a7a\n                    board[x][y] = '.'\n            return False\n        return find_s(0)\nif __name__ == '__main__':\n    board = [[\"5\", \"3\", \".\", \".\", \"7\", \".\", \".\", \".\", \".\"], [\"6\", \".\", \".\", \"1\", \"9\", \"5\", \".\", \".\", \".\"],\n             [\".\", \"9\", \"8\", \".\", \".\", \".\", \".\", \"6\", \".\"], [\"8\", \".\", \".\", \".\", \"6\", \".\", \".\", \".\", \"3\"],\n             [\"4\", \".\", \".\", \"8\", \".\", \"3\", \".\", \".\", \"1\"], [\"7\", \".\", \".\", \".\", \"2\", \".\", \".\", \".\", \"6\"],\n             [\".\", \"6\", \".\", \".\", \".\", \".\", \"2\", \"8\", \".\"], [\".\", \".\", \".\", \"4\", \"1\", \"9\", \".\", \".\", \"5\"],\n             [\".\", \".\", \".\", \".\", \"8\", \".\", \".\", \"7\", \"9\"]]\n    print(Solution().solveSudoku(board))\n<\/pre>\n\n\n<p><strong>\u601d\u8def<\/strong>\uff1a\u5176\u5b9e\u521a\u5f00\u59cb\u5e76\u4e0d\u77e5\u9053\u600e\u4e48\u89e3\u6570\u72ec\uff0c\u6211\u89e3\u6570\u72ec\u591a\u534a\u5c31\u662f\u4e00\u70b9\u70b9\u8bd5\u76842333\u3002\u6211\u53bb\u77e5\u4e4e\u641c\u4e86\u4e00\u5708\uff0c\u53d1\u73b0\u4e86\u4e00\u4e9b\u7b80\u5355\u7684\uff08\u5bf9\u4e8e\u4eba\uff09\u7684\u89e3\u6cd5\uff0c\u5c31\u662f\u628a\u6bcf\u4e00\u4e2a\u7a7a\u767d\u7684\u53ef\u586b\u6570\u5b57\u627e\u5230\uff0c\u4f7f\u7528 \u4e09\u5230\u56db\u4e2a\u7ea6\u675f\u6761\u4ef6\uff0c \u4e00\u70b9\u70b9\u7684\u786e\u5b9a\u7a7a\u767d\u6216\u8005\u7f29\u51cf\u53ef\u586b\u6570\u5b57\u5217\u8868\u4ee5\u6b64\u6162\u6162\u89e3\u51fa\u6574\u4e2a\u6570\u72ec\u3002<\/p>\n\n\n<p>\u4f46\u662f\u8fd9\u4e2a\u65b9\u6cd5\u8bf4\u5b9e\u8bdd\u5bf9\u4e8e\u4eba\u7b80\u5355\uff0c\u4f46\u662f\u5bf9\u4e8e\u673a\u5668\uff0c\u597d\u591a\u5224\u65ad\u903b\u8f91\u9700\u8981\u5927\u91cf\u7684\u4ee3\u7801\u652f\u6491\uff0c\u56e0\u6b64\u9009\u62e9\u4e86\u5bf9\u4e8e\u673a\u5668\u76f8\u5bf9\u53cb\u597d\u5bf9\u4e8e\u4eba\u76f8\u5bf9\u5c31\u4e0d\u53cb\u597d\u7684\u56de\u6714\u6cd5\u8fdb\u884c\u6c42\u89e3\u3002<\/p>\n\n\n<p>\u8fd9\u4e2a\u65b9\u6cd5\u7c7b\u4f3c\u4e8e\u9012\u5f52\u7a77\u4e3e\uff0c\u53ef\u4ee5\u7b80\u5355\u7406\u89e3\u6210\u6709\u4e00\u4e2a9*9\u7684\u6808\uff0c\u6bcf\u778e\u586b\u4e00\u4e2a\u5730\u65b9\u5c31\u5165\u6808\uff0c\u6808\u6ee1\u8bf4\u660e\u89e3\u51fa\u4e86\u6570\u72ec\u3002<\/p>\n\n\n<p>\u5148\u968f\u673a\u653e\u4e00\u4e2a\u6ee1\u8db3\u5f53\u524d\u4f4d\u7f6e\u6761\u4ef6\u7684\u6570\uff0c\u7136\u540e\u4e00\u76f4\u5411\u540e\u5bfb\u627e\uff0c\u5982\u679c\u67d0\u4e2a\u4f4d\u7f6e\u6ca1\u529e\u6cd5\u653e\u7f6e\u6ee1\u8db3\u6761\u4ef6\u7684\u6570\uff0c\u90a3\u4e48\u5c31\u56de\u6eaf\uff08\u5c31\u662f\u51fa\u6808\uff09\u76f4\u81f3\u53ef\u4ee5\u7ee7\u7eed\u8ba1\u7b97\u4e0b\u4e00\u4e2a\u4f4d\u7f6e\u7684\u7d22\u5f15\uff08\u5341\u5206\u7c7b\u4f3c\u4e8e\u6df1\u641c\uff09\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/leetcode-cn.com\/problems\/sudoku-solver\/ #  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[10],"tags":[],"views":1649,"_links":{"self":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/2861"}],"collection":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2861"}],"version-history":[{"count":0,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/2861\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2861"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}