{"id":8007,"date":"2022-07-14T22:11:12","date_gmt":"2022-07-14T16:41:12","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=8007"},"modified":"2022-07-14T22:13:59","modified_gmt":"2022-07-14T16:43:59","slug":"number-array-once-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/number-array-once-golang\/","title":{"rendered":"Find the number which appears once in an  array in Go(Golang)"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/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-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/number-array-once-golang\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/number-array-once-golang\/#Program\" title=\"Program\">Program<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"has-luminous-vivid-orange-color has-text-color has-large-font-size wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">An array is given in which every element is present twice except one element. The objective is to find that element in constant extra space<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Example 1<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Input: [2, 1, 2, 3, 3]\nOutput: 1<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Example 2<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Input: [1, 1, 4]\nOutput: 4<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">The idea is to use XOR here. Here we will use two properties of XOR<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>XOR of a number with itself is 0<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>XOR of 0 and any number is that number<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">So the idea is to do an XOR of all the numbers in the array. The number that we obtain at the end will be the answer.<\/p>\n\n\n\n<h1 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Program\"><\/span><strong>Program<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Below is the program for the same<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\nfunc singleNumber(nums []int) int {\n\tlenNums := len(nums)\n\tres := 0\n\tfor i := 0; i < lenNums; i++ {\n\t\tres = res ^ nums[i]\n\t}\n\n\treturn res\n}\n\nfunc main() {\n\toutput := singleNumber([]int{2, 1, 2, 3, 3})\n\tfmt.Println(output)\n\n\toutput = singleNumber([]int{1, 1, 4})\n\tfmt.Println(output)\n\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">1\n4<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Note: <\/strong>Check out our Golang Advanced Tutorial. The tutorials in this series are elaborative and we have tried to cover all concepts with examples. This tutorial is for those who are looking to gain expertise and a solid understanding of golang - <a href=\"https:\/\/golangbyexamples.com\/golang-comprehensive-tutorial\/\">Golang Advance Tutorial<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Also if you are interested in understanding how all design patterns can be implemented in Golang. If yes, then this post is for you - <a href=\"https:\/\/golangbyexamples.com\/all-design-patterns-golang\/\">All Design Patterns Golang<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Also, check out our system design tutorial series here - <a href=\"https:\/\/techbyexample.com\/system-design-questions\/\">System Design Tutorial Series<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewProgram Overview An array is given in which every element is present twice except one element. The objective is to find that element in constant extra space Example 1&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[],"class_list":["post-8007","post","type-post","status-publish","format-standard","hentry","category-tech"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Find the number which appears once in an array in Go(Golang) - Welcome To Golang By Example<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/golangbyexamples.com\/number-array-once-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Find the number which appears once in an array in Go(Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Table of Contents OverviewProgram Overview An array is given in which every element is present twice except one element. 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