{"id":6225,"date":"2021-08-21T16:04:30","date_gmt":"2021-08-21T10:34:30","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=6225"},"modified":"2021-08-21T16:05:00","modified_gmt":"2021-08-21T10:35:00","slug":"pair-swap-nodes-linked-list-go","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/pair-swap-nodes-linked-list-go\/","title":{"rendered":"Pair swap nodes in a linked list 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-2\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/pair-swap-nodes-linked-list-go\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/pair-swap-nodes-linked-list-go\/#Program\" title=\"Program\">Program<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"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><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">Given a linked list and a number k reverse nodes of the linked list in groups of k. <\/p>\n\n\n\n<p class=\"has-medium-font-size\">For eg<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Input: 1->2->3->4->5->6->7\nk: 3\nOutput: 3->2->1->6->5->4->7<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">If the length of the\u00a0 last group of the linked is less than k, then leave the last group as it is<\/p>\n\n\n\n<h2 class=\"has-large-font-size wp-block-heading\"><span class=\"ez-toc-section\" id=\"Program\"><\/span><strong>Program<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\nfunc main() {\n\tfirst := initList()\n\tfirst.AddFront(4)\n\tfirst.AddFront(3)\n\tfirst.AddFront(2)\n\tfirst.AddFront(1)\n\n\tfirst.Head.Traverse()\n\ttemp := ReverseKGroup(first.Head, 3)\n        fmt.Println()\n\ttemp.Traverse()\n\n}\n\nfunc initList() *SingleList {\n\treturn &SingleList{}\n}\n\ntype ListNode struct {\n\tVal  int\n\tNext *ListNode\n}\n\nfunc (l *ListNode) Traverse() {\n\tfor l != nil {\n\t\tfmt.Println(l.Val)\n\t\tl = l.Next\n\t}\n}\n\ntype SingleList struct {\n\tLen  int\n\tHead *ListNode\n}\n\nfunc ReverseKGroup(head *ListNode, k int) *ListNode {\n\n\tcurr := head\n\tvar prev *ListNode\n\tvar next *ListNode\n\n\ti := 0\n\n\tfor curr != nil && i < k {\n\t\ti++\n\t\tcurr = curr.Next\n\t}\n\tif i == k {\n\t\tcurr = head\n\t} else {\n\t\treturn head\n\t}\n\n\ti = 0\n\tfor curr != nil &#038;&#038; i < k {\n\t\tnext = curr.Next\n\t\tcurr.Next = prev\n\t\tprev = curr\n\t\tcurr = next\n\t\ti++\n\t}\n\n\thead.Next = ReverseKGroup(curr, k)\n\treturn prev\n}\n\nfunc (s *SingleList) AddFront(num int) {\n\tele := &#038;ListNode{\n\t\tVal: num,\n\t}\n\tif s.Head == nil {\n\t\ts.Head = ele\n\t} else {\n\t\tele.Next = s.Head\n\t\ts.Head = ele\n\t}\n\ts.Len++\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\n2\n3\n4\n\n3\n2\n1\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","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewProgram Overview Given a linked list and a number k reverse nodes of the linked list in groups of k. For eg If the length of the\u00a0 last group&#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":[3,4],"class_list":["post-6225","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Pair swap nodes in a linked list 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\/pair-swap-nodes-linked-list-go\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pair swap nodes in a linked list in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Table of Contents OverviewProgram Overview Given a linked list and a number k reverse nodes of the linked list in groups of k. 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