{"id":8300,"date":"2022-09-12T21:50:36","date_gmt":"2022-09-12T16:20:36","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-generate-n-random-numbers-with-a-sum-of-m-in-public-static-void-main-scanner\/"},"modified":"2022-09-12T21:50:36","modified_gmt":"2022-09-12T16:20:36","slug":"solved-how-to-generate-n-random-numbers-with-a-sum-of-m-in-public-static-void-main-scanner","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-generate-n-random-numbers-with-a-sum-of-m-in-public-static-void-main-scanner\/","title":{"rendered":"[Solved] How to generate n random numbers with a sum of m in public static void main (scanner)?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-35835071\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"35835071\" data-parentid=\"35834929\" data-score=\"0\" 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>To generate <code>n<\/code> numbers whose sum is <code>m<\/code>, you can think permutation of <code>m<\/code> o and <code>n - 1<\/code> |, then count o between | and the number of o will be the numbers generated.<\/p>\n<p>For example, given that m = 10 and n = 4, the permutation may be<\/p>\n<pre><code>o|oooo|ooo|oo\n<\/code><\/pre>\n<p>Then, the results are <code>1, 4, 3, 2<\/code>.<\/p>\n<p>To generate this permutation, you should do shuffle.<\/p>\n<p>You only have to consider position of |, so the implementation may be like this:<\/p>\n<pre><code>int[] generateNumbers(int m, int n) {\n    if(m &lt; 0 || n &lt;= 0) throw new IllegalArgumentException();\n    if (n == 1) return new int[]{m};\n    int separatorNum = n - 1;\n    int permutationLength = m + n - 1;\n    int[] positions = new int[separatorNum];\n    int[] result = new int[n];\n    \/\/ shuffle array of o and |\n    for (int i = 0; i &lt; separatorNum; i++) {\n        int p = (int)(Math.random() * (permutationLength - i)) + i;\n        if (p &gt;= separatorNum) {\n            \/\/ o will be swapped with | if the number was not swapped to | before\n            boolean dupe = false;\n            for (int j = 0; j &lt; i; j++) {\n                if (positions[j] == p) {\n                    dupe = true;\n                    break;\n                }\n            }\n            positions[i] = (dupe ? i : p);\n        } else {\n            \/\/ another | will be swapped with |, so | will be here\n            positions[i] =i;\n        }\n    }\n    \/\/ sort the positions\n    for (int i = positions.length - 1; i &gt; 0; i--) {\n        for (int j = 0; j &lt; i; j++) {\n            if (positions[j] &gt; positions[j + 1]) {\n                int temp = positions[j];\n                positions[j] = positions[j + 1];\n                positions[j + 1] = temp;\n            }\n        }\n    }\n    \/\/ decode the positions\n    result[0] = positions[0];\n    for (int i = 1; i &lt; n - 1; i++) {\n        result[i] = positions[i] - positions[i - 1] - 1;\n    }\n    result[n - 1] = permutationLength - positions[n - 2] - 1;\n    return result;\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to generate n random numbers with a sum of m in public static void main (scanner)? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] To generate n numbers whose sum is m, you can think permutation of m o and n &#8211; 1 |, then count o between | and the number of o will be the numbers generated. For example, given that m = 10 and n = 4, the permutation may be o|oooo|ooo|oo Then, the results &#8230; <a title=\"[Solved] How to generate n random numbers with a sum of m in public static void main (scanner)?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-generate-n-random-numbers-with-a-sum-of-m-in-public-static-void-main-scanner\/\" aria-label=\"More on [Solved] How to generate n random numbers with a sum of m in public static void main (scanner)?\">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":[323],"class_list":["post-8300","post","type-post","status-publish","format-standard","hentry","category-solved","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to generate n random numbers with a sum of m in public static void main (scanner)? - 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-how-to-generate-n-random-numbers-with-a-sum-of-m-in-public-static-void-main-scanner\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to generate n random numbers with a sum of m in public static void main (scanner)? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] To generate n numbers whose sum is m, you can think permutation of m o and n - 1 |, then count o between | and the number of o will be the numbers generated. For example, given that m = 10 and n = 4, the permutation may be o|oooo|ooo|oo Then, the results ... 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