{"id":7237,"date":"2024-02-23T22:19:09","date_gmt":"2024-02-23T14:19:09","guid":{"rendered":"https:\/\/zyrastory.com\/?p=7237"},"modified":"2024-02-23T22:19:11","modified_gmt":"2024-02-23T14:19:11","slug":"leetcode-997-find-the-town-judge-solution-and-explanation-en","status":"publish","type":"post","link":"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-997-find-the-town-judge-solution-and-explanation-en\/","title":{"rendered":"LeetCode #997 Find the Town Judge Solution &#038; Explanation"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >\u5167\u5bb9\u76ee\u9304<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-997-find-the-town-judge-solution-and-explanation-en\/#leetcode-problem\" title=\"LeetCode Problem\">LeetCode Problem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-997-find-the-town-judge-solution-and-explanation-en\/#solution\" title=\"Solution\">Solution<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-997-find-the-town-judge-solution-and-explanation-en\/#c-solution\" title=\"C# Solution\">C# Solution<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-997-find-the-town-judge-solution-and-explanation-en\/#conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"leetcode-problem\"><\/span><strong>LeetCode Problem<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In a town, there are\u00a0<strong>n<\/strong>\u00a0people labeled from\u00a0<strong>1<\/strong>\u00a0to\u00a0<strong>n<\/strong>. There is a rumor that one of these people is secretly the town judge.<\/p>\n\n\n\n<p>If the town judge exists, then:<\/p>\n\n\n\n<ol>\n<li>The town judge trusts nobody.<\/li>\n\n\n\n<li>Everybody (except for the town judge) trusts the town judge.<\/li>\n\n\n\n<li>There is exactly one person that satisfies properties&nbsp;<strong>1<\/strong>&nbsp;and&nbsp;<strong>2<\/strong>.<\/li>\n<\/ol>\n\n\n\n<p>You are given an array\u00a0<strong>trust\u00a0<\/strong>where\u00a0<strong>trust[i] = [a<sub>i<\/sub>, b<sub>i<\/sub>]<\/strong>\u00a0representing that the person labeled\u00a0<strong>a<sub>i<\/sub><\/strong>\u00a0trusts the person labeled\u00a0<strong>b<sub>i<\/sub><\/strong>. If a trust relationship does not exist in\u00a0<strong>trust\u00a0<\/strong>array, then such a trust relationship does not exist.<\/p>\n\n\n\n<p>Return\u00a0<em>the label of the town judge if the town judge exists and can be identified, or return\u00a0<\/em><strong>-1<\/strong><em>\u00a0otherwise<\/em>.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"647\" height=\"824\" src=\"https:\/\/zyrastory.com\/wp-content\/uploads\/2024\/02\/997_Examples_Constraints.webp\" alt=\"\" class=\"wp-image-7241\" srcset=\"https:\/\/zyrastory.com\/wp-content\/uploads\/2024\/02\/997_Examples_Constraints.webp 647w, https:\/\/zyrastory.com\/wp-content\/uploads\/2024\/02\/997_Examples_Constraints-236x300.webp 236w\" sizes=\"(max-width: 647px) 100vw, 647px\" \/><\/figure>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"solution\"><\/span><strong>Solution<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>We can use a HashSet to store the people who trust another person, and a dictionary to store the count of how many times each person is trusted by others according to the trust array.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"c-solution\"><\/span><strong>C# Solution<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>Solution1<\/strong> <\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-csharp\" data-lang=\"C#\"><code>public class Solution {\n    public int FindJudge(int n, int[][] trust) {\n        \/\/ If there is only one person in the town, that person must be the judge.\n        if(n==1){\n            return 1;\n        }\n\n        HashSet&lt;int&gt; hSet = new HashSet&lt;int&gt;();    \/\/store the people who trust another one.\n        Dictionary&lt;int,int&gt; dict =  new Dictionary&lt;int,int&gt;();  \/\/store the count of trusts for each person.\n\n        foreach(var item in trust){\n            hSet.Add(item[0]);\n            if (!dict.ContainsKey(item[1]))\n            {\n                dict.Add(item[1], 1);\n            }\n            else\n            {\n                dict[item[1]] = dict[item[1]]+1;\n            }\n        }\n\n        \/\/Everybody (except for the town judge) trusts the town judge.\n        if(hSet.Count!=n-1){    \n            return -1;\n        }\n\n        \/\/ Find the person who is trusted by all others.\n        int key = dict.FirstOrDefault(x =&gt; x.Value == n-1).Key;\n        return key&gt;0 ? key : -1;\n    }\n}<\/code><\/pre><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tw-target-text\"><span class=\"ez-toc-section\" id=\"conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>This feels more like a guessing game for someone&#8217;s identity, doesn&#8217;t it?<\/p>\n\n\n\n<div style=\"height:45px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-medium-font-size\">\ud83e\udde1<strong>If my solution helps, that is my honor!<\/strong><\/p>\n\n\n\n<p>\ud83e\udde1<strong>You can support me by  sharing my posts, thanks a lot<\/strong><\/p>\n\n\n\n<p>\u2705<strong>If you got any problem about the explanation, please feel free to let me know<\/strong><\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>The problem link:<\/strong> <a href=\"https:\/\/leetcode.com\/problems\/find-the-town-judge\/description\/\" target=\"_blank\" rel=\"noreferrer noopener\">Find the Town Judge &#8211; LeetCode<\/a><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Some Random LeetCode posts<\/strong><\/p>\n\n\n\n\t\t\t<div class=\"wp-block-uagb-post-grid uagb-post-grid  uagb-post__image-position-top uagb-post__image-disabled uagb-block-f4bc3f3d     uagb-post__items uagb-post__columns-3 is-grid uagb-post__columns-tablet-2 uagb-post__columns-mobile-1 uagb-post__equal-height\" data-total=\"13\" style=\"\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"uagb-post__inner-wrap\">\t\t\t\t\t\t\t\t<h4 class=\"uagb-post__title uagb-post__text\">\n\t\t\t\t<a href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-389-find-the-difference-solution-and-explanation-en\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">LeetCode #389 Find the Difference Solution &#038; Explanation<\/a>\n\t\t\t<\/h4>\n\t\t\t\t\t\t<div class='uagb-post__text uagb-post-grid-byline'>\n\t\t\t\t\t\t\t\t<time datetime=\"2024-02-18T23:02:13+08:00\" class=\"uagb-post__date\">\n\t\t\t\t<span class=\"dashicons-calendar dashicons\"><\/span>\t\t\t\t\t2024-02-18\t\t\t\t<\/time>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"uagb-post__text uagb-post__cta wp-block-button\">\n\t\t\t\t<a class=\"wp-block-button__link uagb-text-link\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-389-find-the-difference-solution-and-explanation-en\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Read More<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/article>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"uagb-post__inner-wrap\">\t\t\t\t\t\t\t\t<h4 class=\"uagb-post__title uagb-post__text\">\n\t\t\t\t<a href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-234-palindrome-linked-list-solution-and-explanation-en\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">LeetCode #234 Palindrome Linked List Solution &amp; 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Explanation<\/a>\n\t\t\t<\/h4>\n\t\t\t\t\t\t<div class='uagb-post__text uagb-post-grid-byline'>\n\t\t\t\t\t\t\t\t<time datetime=\"2022-06-03T16:49:07+08:00\" class=\"uagb-post__date\">\n\t\t\t\t<span class=\"dashicons-calendar dashicons\"><\/span>\t\t\t\t\t2022-06-03\t\t\t\t<\/time>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"uagb-post__text uagb-post__cta wp-block-button\">\n\t\t\t\t<a class=\"wp-block-button__link uagb-text-link\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-118-pascals-triangle-solution-explanation\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Read More<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/article>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"uagb-post__inner-wrap\">\t\t\t\t\t\t\t\t<h4 class=\"uagb-post__title uagb-post__text\">\n\t\t\t\t<a href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-122-best-time-to-buy-and-sell-stock-ii-solution-and-explanation-en\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">LeetCode #122\u00a0Best Time to Buy and Sell Stock II Solution &#038; Explanation<\/a>\n\t\t\t<\/h4>\n\t\t\t\t\t\t<div class='uagb-post__text uagb-post-grid-byline'>\n\t\t\t\t\t\t\t\t<time datetime=\"2022-12-29T17:02:49+08:00\" class=\"uagb-post__date\">\n\t\t\t\t<span class=\"dashicons-calendar dashicons\"><\/span>\t\t\t\t\t2022-12-29\t\t\t\t<\/time>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"uagb-post__text uagb-post__cta wp-block-button\">\n\t\t\t\t<a class=\"wp-block-button__link uagb-text-link\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-122-best-time-to-buy-and-sell-stock-ii-solution-and-explanation-en\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Read More<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/article>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"uagb-post-pagination-wrap\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t","protected":false},"excerpt":{"rendered":"<p>Discover the town judge&#8217;s identity through logical deduction. <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[62],"tags":[84,88],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>LeetCode #997 Find the Town Judge Solution &amp; 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