{"id":7279,"date":"2024-03-14T05:19:15","date_gmt":"2024-03-14T05:19:15","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-remove-duplicate-elements-in-an-array-using-c-language\/"},"modified":"2025-08-02T14:11:02","modified_gmt":"2025-08-02T14:11:02","slug":"how-to-remove-duplicate-elements-in-an-array-using-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-remove-duplicate-elements-in-an-array-using-c-language\/","title":{"rendered":"Remove Duplicates in C Arrays"},"content":{"rendered":"<p>There are two methods to remove duplicate elements from an array.<\/p>\n<ol>\n<li>Create a new array, go through the original array, and store unique elements in the new array.<\/li>\n<li>Copy the new array back to the original array.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">removeDuplicates<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> arr[], <span class=\"hljs-type\">int<\/span> n)<\/span> {\r\n    <span class=\"hljs-keyword\">if<\/span> (n == <span class=\"hljs-number\">0<\/span> || n == <span class=\"hljs-number\">1<\/span>) {\r\n        <span class=\"hljs-keyword\">return<\/span> n;\r\n    }\r\n\r\n    <span class=\"hljs-type\">int<\/span> temp[n];\r\n    <span class=\"hljs-type\">int<\/span> j = <span class=\"hljs-number\">0<\/span>;\r\n    \r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; n - <span class=\"hljs-number\">1<\/span>; i++) {\r\n        <span class=\"hljs-keyword\">if<\/span> (arr[i] != arr[i + <span class=\"hljs-number\">1<\/span>]) {\r\n            temp[j++] = arr[i];\r\n        }\r\n    }\r\n\r\n    temp[j++] = arr[n - <span class=\"hljs-number\">1<\/span>];\r\n\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; j; i++) {\r\n        arr[i] = temp[i];\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> j;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Using two pointers, one pointing to the current element and the other pointing to the next different element.<\/li>\n<li>Traverse the original array, and if the current element is not the same as the next element, copy the next element to the position after the current element.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">removeDuplicates<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> arr[], <span class=\"hljs-type\">int<\/span> n)<\/span> {\r\n    <span class=\"hljs-keyword\">if<\/span> (n == <span class=\"hljs-number\">0<\/span> || n == <span class=\"hljs-number\">1<\/span>) {\r\n        <span class=\"hljs-keyword\">return<\/span> n;\r\n    }\r\n\r\n    <span class=\"hljs-type\">int<\/span> j = <span class=\"hljs-number\">0<\/span>;\r\n\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; n - <span class=\"hljs-number\">1<\/span>; i++) {\r\n        <span class=\"hljs-keyword\">if<\/span> (arr[i] != arr[i + <span class=\"hljs-number\">1<\/span>]) {\r\n            arr[j++] = arr[i];\r\n        }\r\n    }\r\n\r\n    arr[j++] = arr[n - <span class=\"hljs-number\">1<\/span>];\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> j;\r\n}\r\n<\/code><\/pre>\n<p>Both of these methods can achieve the function of removing duplicate elements in an array, the specific choice of method depends on the specific situation and requirements.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>There are two methods to remove duplicate elements from an array. Create a new array, go through the original array, and store unique elements in the new array. Copy the new array back to the original array. int removeDuplicates(int arr[], int n) { if (n == 0 || n == 1) { return n; } [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[7899,3202,2026,381,9283],"class_list":["post-7279","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-algorithms","tag-array-manipulation","tag-c-arrays","tag-c-programming","tag-duplicate-removal"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Remove Duplicates in C Arrays - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn efficient methods to remove duplicate elements in C arrays. 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