{"id":485,"date":"2020-09-26T10:47:27","date_gmt":"2020-09-26T02:47:27","guid":{"rendered":"http:\/\/39.96.58.60\/?p=485"},"modified":"2022-10-18T16:39:03","modified_gmt":"2022-10-18T08:39:03","slug":"leetcode-17-%e7%94%b5%e8%af%9d%e5%8f%b7%e7%a0%81%e7%9a%84%e5%ad%97%e6%af%8d%e7%bb%84%e5%90%88","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=485","title":{"rendered":"Leetcode 17. \u7535\u8bdd\u53f7\u7801\u7684\u5b57\u6bcd\u7ec4\u5408"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4ec5\u5305\u542b\u6570\u5b57&nbsp;<code>2-9<\/code>&nbsp;\u7684\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u6240\u6709\u5b83\u80fd\u8868\u793a\u7684\u5b57\u6bcd\u7ec4\u5408\u3002<\/p>\n<p>\u7ed9\u51fa\u6570\u5b57\u5230\u5b57\u6bcd\u7684\u6620\u5c04\u5982\u4e0b\uff08\u4e0e\u7535\u8bdd\u6309\u952e\u76f8\u540c\uff09\u3002\u6ce8\u610f 1 \u4e0d\u5bf9\u5e94\u4efb\u4f55\u5b57\u6bcd\u3002<\/p>\n<p><img src=\"https:\/\/assets.leetcode-cn.com\/aliyun-lc-upload\/original_images\/17_telephone_keypad.png\" style=\"width: 200px;\"><\/p>\n<p><strong>\u793a\u4f8b:<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>\"23\"\n\n<strong>\u8f93\u51fa\uff1a<\/strong>[\"ad\", \"ae\", \"af\", \"bd\", \"be\", \"bf\", \"cd\", \"ce\", \"cf\"].\n\n<\/pre>\n<p><strong>\u8bf4\u660e:<\/strong><\/p>\n<p>\u5c3d\u7ba1\u4e0a\u9762\u7684\u7b54\u6848\u662f\u6309\u5b57\u5178\u5e8f\u6392\u5217\u7684\uff0c\u4f46\u662f\u4f60\u53ef\u4ee5\u4efb\u610f\u9009\u62e9\u7b54\u6848\u8f93\u51fa\u7684\u987a\u5e8f\u3002<\/p>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u5b57\u7b26\u4e32\u3001 \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\uff1a36 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8686.65% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.6 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8686.43% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u591a\u91cd\u5faa\u73af\uff0c\u4f9d\u6b21\u586b\u5165\u5b57\u7b26\n\"\"\"\nclass Solution:\n    def letterCombinations(self, digits: str) -&gt; List[str]:\n        letter_dict = {\n            '1':[],\n            '2':['a', 'b', 'c'],\n            '3':['d', 'e', 'f'],\n            '4':['g', 'h', 'i'],\n            '5':['j', 'k', 'l'],\n            '6':['m', 'n', 'o'],\n            '7':['p', 'q', 'r', 's'],\n            '8':['t', 'u', 'v'],\n            '9':['w', 'x', 'y', 'z']\n        }\n\n        if digits == '':\n            return []\n\n        result = letter_dict[digits[0]]\n        if len(digits) == 1:\n            return result\n\n        for s in digits[1:]:\n            result_ = []\n            for letter in letter_dict[s]:\n                for r in result:\n                    result_.append(r+letter)\n            result = result_.copy()\n\n        return result<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4ec5\u5305\u542b\u6570\u5b57&nbsp;2-9&nbsp;\u7684\u5b57\u7b26\u4e32\uff0c\u8fd4\u56de\u6240\u6709\u5b83\u80fd\u8868\u793a\u7684\u5b57\u6bcd\u7ec4\u5408\u3002 \u7ed9\u51fa\u6570\u5b57\u5230\u5b57\u6bcd\u7684\u6620\u5c04\u5982&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","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\/485"}],"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=485"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/485\/revisions"}],"predecessor-version":[{"id":486,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/485\/revisions\/486"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=485"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=485"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=485"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}