{"id":85,"date":"2018-12-06T21:29:18","date_gmt":"2018-12-06T21:29:18","guid":{"rendered":"https:\/\/andybase.com\/?p=85"},"modified":"2018-12-06T21:29:19","modified_gmt":"2018-12-06T21:29:19","slug":"949-largest-time-for-given-digits","status":"publish","type":"post","link":"https:\/\/andybase.com\/?p=85","title":{"rendered":"949 Largest Time for Given Digits"},"content":{"rendered":"\n<p>link:\u00a0<a href=\"https:\/\/leetcode.com\/problems\/largest-time-for-given-digits\/\">https:\/\/leetcode.com\/problems\/largest-time-for-given-digits\/<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thought<\/h2>\n\n\n\n<p>Its easy to think use DFS to solve it: it has limit data(4 digits), and DFS will enumerates all possible combinations<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Code<\/h2>\n\n\n\n<pre class=\"wp-block-syntaxhighlighter-code brush: python; notranslate\">class Solution:\n    def largestTimeFromDigits(self, A):\n        \"\"\"\n        :type A: List[int]\n        :rtype: str\n        \"\"\"\n        self.res = -1\n        def dfs(A, res, visited):\n            if len(res) == 4:\n                if res[0] * 10 + res[1] &lt; 24 and res[2] * 10 + res[3] &lt; 60:\n                    self.res = max(self.res, res[0]* 1000 + res[1] * 100 + res[2] * 10 + res[3])\n            for j in range(4):\n                if not visited[j]:\n                    visited[j] = True\n                    res.append(A[j])\n                    dfs(A,res, visited)\n                    visited[j] = False\n                    res.pop(-1)\n        dfs(A, [], [False, False, False,False]) \n        if self.res == -1:\n            return \"\"\n        return str(self.res\/\/ 100).zfill(2) + \":\" + str(self.res % 100).zfill(2)<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Runtime<\/h2>\n\n\n\n<p>Time: O(n!)<br>Space: O(n!)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>link:\u00a0https:\/\/leetcode.com\/problems\/largest-time-for-given-digits\/ Thought Its easy to think use DFS to solve it: it has limit data(4 digits), and DFS will enumerates [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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