{"id":6708,"date":"2022-09-04T18:18:56","date_gmt":"2022-09-04T12:48:56","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-shift-all-elements-in-a-2-dimensional-array-by-column-index\/"},"modified":"2022-09-04T18:18:56","modified_gmt":"2022-09-04T12:48:56","slug":"solved-shift-all-elements-in-a-2-dimensional-array-by-column-index","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-shift-all-elements-in-a-2-dimensional-array-by-column-index\/","title":{"rendered":"[Solved] Shift all elements in a 2-dimensional array by column index"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-39010930\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"39010930\" data-parentid=\"39010486\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>This program uses a logic in which we rotate an array by reversing array in parts. First we will reverse array upto index location and then reverse remaining array ( index+1 to last element of array).<br \/>\nAfter completing above two steps we call again reverse function but this time on whole of the array that gives us the required output.<\/p>\n<p>Below is the code that will help in understanding above logic described.<\/p>\n<pre><code>public class ShiftTwoDArray {\n\n    public static void main(String[] args) {\n        int[][] x = {   { 1, 2, 3, 4, 5, 6, 7 }, \n                        { 1, 2, 3, 4, 5, 6, 7 }, \n                        { 1, 2, 3, 4, 5, 6, 7 },\n                        { 1, 2, 3, 4, 5, 6, 7 } \n                    };\n\n        int index = 3;\n        int i, j;\n        \/\/ System.out.println(x.length);\n        System.out.println(\"Before\");\n        for (i = 0; i &lt; x.length; i++) {\n            for (j = 0; j &lt; x[i].length; j++) {\n                System.out.print(x[i][j] + \"  \");\n            }\n            System.out.println();\n        }\n        rotate(x, index);\n\n        System.out.println(\"\\nAfter\");\n        for (i = 0; i &lt; x.length; i++) {\n            for (j = 0; j &lt; x[i].length; j++) {\n                System.out.print(x[i][j] + \"  \");\n            }\n            System.out.println();\n        }\n    }\n\n    \/**\n     * @param x\n     * @param index\n     * calls rotateUtil on each row\n     *\/\n    private static void rotate(int[][] x, int index) {\n        for (int i = 0; i &lt; x.length; i++) {\n            rotateUtil(x[i], index);\n        }\n    }\n\n    \/**\n     * @param x\n     * @param index\n     * reverse array in parts and then reverse whole array\n     *\/\n    private static void rotateUtil(int[] x, int index) {\n        reverse(x, 0, index);\n        reverse(x, index + 1, x.length - 1);\n        reverse(x, 0, x.length - 1);\n    }\n\n    \/**\n     * @param x\n     * @param start\n     * @param end\n     * reverse an array\n     *\/\n    private static void reverse(int[] x, int start, int end) {\n        int temp = 0;\n        while (start &lt; end) {\n            temp = x[start];\n            x[start] = x[end];\n            x[end] = temp;\n            start++;\n            end--;\n        }\n    }\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Shift all elements in a 2-dimensional array by column index <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] This program uses a logic in which we rotate an array by reversing array in parts. First we will reverse array upto index location and then reverse remaining array ( index+1 to last element of array). After completing above two steps we call again reverse function but this time on whole of the array &#8230; <a title=\"[Solved] Shift all elements in a 2-dimensional array by column index\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-shift-all-elements-in-a-2-dimensional-array-by-column-index\/\" aria-label=\"More on [Solved] Shift all elements in a 2-dimensional array by column index\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[361,323],"class_list":["post-6708","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] Shift all elements in a 2-dimensional array by column index - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-shift-all-elements-in-a-2-dimensional-array-by-column-index\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Shift all elements in a 2-dimensional array by column index - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This program uses a logic in which we rotate an array by reversing array in parts. 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