{"id":12217,"date":"2022-09-30T02:03:00","date_gmt":"2022-09-29T20:33:00","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-priority-sort-characters\/"},"modified":"2022-09-30T02:03:00","modified_gmt":"2022-09-29T20:33:00","slug":"solved-how-to-priority-sort-characters","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-priority-sort-characters\/","title":{"rendered":"[Solved] How to priority sort characters?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-23858421\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"23858421\" data-parentid=\"23857372\" 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>So, you want to sort an array of custom objects, like this:<\/p>\n<pre><code>typedef struct {\n    char c;  \/\/ a character\n    int i;   \/\/ a number\n} pair;\n<\/code><\/pre>\n<p>Then you can apply a standard function <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/en.cppreference.com\/w\/cpp\/algorithm\/qsort\"><code>qsort()<\/code><\/a> with a custom compare function like this:<\/p>\n<pre><code>int compare(const void *a, const void *b) {\n    pair *p1 = (pair*) a;\n    pair *p2 = (pair*) b;\n    if (p1-&gt;c == p2-&gt;c) return p1-&gt;i - p2-&gt;i;\n    if (p1-&gt;c == 'C' || p1-&gt;c == 'G' &amp;&amp; p2-&gt;c == 'A') return -1;\n    return 1;\n}\n<\/code><\/pre>\n<p>So that this testing code with your test data will print <code>C,1 C,8 G,2 G,5 A,4 A,7 A,10<\/code><\/p>\n<pre><code>int main() {\n    pair input[] = {{'A', 10}, {'A', 7}, {'G', 5},\n                    {'C', 8}, {'A', 4}, {'C', 1}, {'G', 2}};\n    qsort(input, 7, sizeof(pair), compare);\n    pair *cur = input;\n    for (int i=0; i&lt;7; ++i, ++cur) {\n        printf(\"%c,%d \", cur-&gt;c, cur-&gt;i);\n    }\n    printf(\"\\n\");\n}\n<\/code><\/pre>\n<p>How to transform arbitrary input into array of structures, is an exercise.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">12<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to priority sort characters? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] So, you want to sort an array of custom objects, like this: typedef struct { char c; \/\/ a character int i; \/\/ a number } pair; Then you can apply a standard function qsort() with a custom compare function like this: int compare(const void *a, const void *b) { pair *p1 = (pair*) &#8230; <a title=\"[Solved] How to priority sort characters?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-priority-sort-characters\/\" aria-label=\"More on [Solved] How to priority sort characters?\">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":[324,859,561],"class_list":["post-12217","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-data-structures","tag-sorting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to priority sort characters? - 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-priority-sort-characters\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to priority sort characters? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] So, you want to sort an array of custom objects, like this: typedef struct { char c; \/\/ a character int i; \/\/ a number } pair; Then you can apply a standard function qsort() with a custom compare function like this: int compare(const void *a, const void *b) { pair *p1 = (pair*) ... 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