{"id":645,"date":"2020-09-26T11:06:52","date_gmt":"2020-09-26T03:06:52","guid":{"rendered":"http:\/\/39.96.58.60\/?p=645"},"modified":"2022-10-18T16:38:24","modified_gmt":"2022-10-18T08:38:24","slug":"leetcode-7-%e6%95%b4%e6%95%b0%e5%8f%8d%e8%bd%ac","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=645","title":{"rendered":"Leetcode 7. \u6574\u6570\u53cd\u8f6c"},"content":{"rendered":"<p>\u7ed9\u51fa\u4e00\u4e2a 32 \u4f4d\u7684\u6709\u7b26\u53f7\u6574\u6570\uff0c\u4f60\u9700\u8981\u5c06\u8fd9\u4e2a\u6574\u6570\u4e2d\u6bcf\u4f4d\u4e0a\u7684\u6570\u5b57\u8fdb\u884c\u53cd\u8f6c\u3002<\/p>\n<p><strong>\u793a\u4f8b&nbsp;1:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> 123\n\n<strong>\u8f93\u51fa:<\/strong> 321\n\n<\/pre>\n<p><strong>&nbsp;\u793a\u4f8b 2:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> -123\n\n<strong>\u8f93\u51fa:<\/strong> -321\n\n<\/pre>\n<p><strong>\u793a\u4f8b 3:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> 120\n\n<strong>\u8f93\u51fa:<\/strong> 21\n\n<\/pre>\n<p><strong>\u6ce8\u610f:<\/strong><\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u7684\u73af\u5883\u53ea\u80fd\u5b58\u50a8\u5f97\u4e0b 32 \u4f4d\u7684\u6709\u7b26\u53f7\u6574\u6570\uff0c\u5219\u5176\u6570\u503c\u8303\u56f4\u4e3a&nbsp;[\u22122<sup>31<\/sup>,&nbsp; 2<sup>31&nbsp;<\/sup>\u2212 1]\u3002\u8bf7\u6839\u636e\u8fd9\u4e2a\u5047\u8bbe\uff0c\u5982\u679c\u53cd\u8f6c\u540e\u6574\u6570\u6ea2\u51fa\u90a3\u4e48\u5c31\u8fd4\u56de 0\u3002<\/p>\n<p>**\u96be\u5ea6**: Easy<\/p>\n<p>**\u6807\u7b7e**: \u6570\u5b66\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\uff1a48 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8644.37% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.6 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8675.16% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u5224\u65ad\u8f93\u5165\u6574\u6570\u6b63\u8d1f\u5e76\u8bb0\u5f55\uff0c\u4f9d\u6b21\u53d6\u51fa\u8f93\u5165\u6574\u6570\u7684\u6700\u540e\u4e00\u4f4d\uff0c\u5b58\u5165\u5217\u8868\uff0c\u518d\u53cd\u5e8f\u53d6\u51fa\n\"\"\"\nclass Solution:\n    def reverse(self, x: int) -&gt; int:\n\n        if x&lt;0:\n            negative = -1\n            x = -x\n            max_ = 2**31\n        else:\n            max_ = 2**31-1\n            negative = 1\n        record = []\n        print(max_)\n        while x != 0:\n            record.append(x%10)\n            x = x\/\/10\n\n        num = 0\n        for i, v in enumerate(record[::-1]):\n            num += v*10**i\n            if num &gt; max_:\n                return 0\n        return num*negative<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u51fa\u4e00\u4e2a 32 \u4f4d\u7684\u6709\u7b26\u53f7\u6574\u6570\uff0c\u4f60\u9700\u8981\u5c06\u8fd9\u4e2a\u6574\u6570\u4e2d\u6bcf\u4f4d\u4e0a\u7684\u6570\u5b57\u8fdb\u884c\u53cd\u8f6c\u3002 \u793a\u4f8b&nbsp;1: \u8f93\u5165: 123&#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\/645"}],"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=645"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/645\/revisions"}],"predecessor-version":[{"id":646,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/645\/revisions\/646"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=645"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=645"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}