{"id":526,"date":"2024-12-25T01:07:07","date_gmt":"2024-12-24T17:07:07","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=526"},"modified":"2024-12-25T01:07:07","modified_gmt":"2024-12-24T17:07:07","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-c-%e4%b8%ad%e5%ae%9e%e7%8e%b0%e4%b8%a5%e6%a0%bc%e7%9a%84%e5%bc%b1%e6%8e%92%e5%ba%8f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2024\/12\/25\/%e5%a6%82%e4%bd%95%e5%9c%a8-c-%e4%b8%ad%e5%ae%9e%e7%8e%b0%e4%b8%a5%e6%a0%bc%e7%9a%84%e5%bc%b1%e6%8e%92%e5%ba%8f%ef%bc%9f\/","title":{"rendered":"\u5982\u4f55\u5728 C \u4e2d\u5b9e\u73b0\u4e25\u683c\u7684\u5f31\u6392\u5e8f\uff1f"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u4e25\u683c\u7684\u5f31\u6392\u5e8f\uff08Strict Weak Ordering\uff09\u662f\u4e00\u79cd\u6392\u5e8f\u5173\u7cfb\uff0c\u901a\u5e38\u7528\u4e8e\u5904\u7406\u6bd4\u8f83\u64cd\u4f5c\u65f6\u3002\u5b83\u8981\u6c42\u5728\u6392\u5e8f\u4e2d\u6ee1\u8db3\u4e00\u5b9a\u7684\u6761\u4ef6\uff0c\u4f7f\u5f97\u5143\u7d20\u4e4b\u95f4\u7684\u6bd4\u8f83\u7ed3\u679c\u66f4\u52a0\u6e05\u6670\u548c\u4e00\u81f4\u3002\u4e25\u683c\u7684\u5f31\u6392\u5e8f\u901a\u5e38\u5728\u7b97\u6cd5\u548c\u6570\u636e\u7ed3\u6784\u4e2d\u7528\u4e8e\u5b9e\u73b0\u6392\u5e8f\uff0c\u4f8b\u5982\u5728 C++ \u7684 <code>std::sort<\/code> \u6216 <code>std::set<\/code> \u4e2d\u3002<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4e25\u683c\u7684\u5f31\u6392\u5e8f\u7684\u5b9a\u4e49<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e25\u683c\u7684\u5f31\u6392\u5e8f\u662f\u4e00\u79cd\u6bd4\u8f83\u5173\u7cfb\uff0c\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4f20\u9012\u6027<\/strong>\uff1a\u5982\u679c <code>a &lt; b<\/code> \u4e14 <code>b &lt; c<\/code>\uff0c\u90a3\u4e48 <code>a &lt; c<\/code>\u3002<\/li>\n\n\n\n<li><strong>\u53cd\u5bf9\u79f0\u6027<\/strong>\uff1a\u5982\u679c <code>a &lt; b<\/code> \u548c <code>b &lt; a<\/code> \u540c\u65f6\u4e3a\u771f\uff0c\u5219 <code>a == b<\/code>\u3002<\/li>\n\n\n\n<li><strong>\u4e0d\u53ef\u5ffd\u89c6\u7684\u987a\u5e8f\u6027<\/strong>\uff1a\u5982\u679c <code>a &lt; b<\/code>\uff0c\u90a3\u4e48 <code>a != b<\/code>\uff0c\u5373 <code>a<\/code> \u603b\u662f\u5c0f\u4e8e <code>b<\/code>\uff0c\u4e0d\u80fd\u901a\u8fc7\u5176\u4ed6\u5173\u7cfb\u5f97\u5230\u76f8\u7b49\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4e25\u683c\u7684\u5f31\u6392\u5e8f\u7684\u5e94\u7528<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e25\u683c\u7684\u5f31\u6392\u5e8f\u53ef\u4ee5\u7528\u4e8e\u6392\u5e8f\u7b97\u6cd5\u4e2d\uff0c\u786e\u4fdd\u5143\u7d20\u4e4b\u95f4\u7684\u5173\u7cfb\u660e\u786e\u4e14\u4e00\u81f4\u3002\u6211\u4eec\u5728\u5b9e\u73b0\u6392\u5e8f\u65f6\uff0c\u53ef\u4ee5\u5229\u7528\u6bd4\u8f83\u64cd\u4f5c\u7b26\u6765\u7ef4\u62a4\u8fd9\u79cd\u5173\u7cfb\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5982\u4f55\u5728 C \u4e2d\u5b9e\u73b0\u4e25\u683c\u7684\u5f31\u6392\u5e8f<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 C \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u6bd4\u8f83\u51fd\u6570\u6765\u5b9e\u73b0\u4e25\u683c\u7684\u5f31\u6392\u5e8f\u3002\u901a\u5e38\u6211\u4eec\u4f1a\u4f7f\u7528 <code>qsort<\/code> \u51fd\u6570\u6765\u8fdb\u884c\u6392\u5e8f\u3002\u4ee5\u4e0b\u662f\u5b9e\u73b0\u4e25\u683c\u7684\u5f31\u6392\u5e8f\u7684\u6b65\u9aa4\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5b9a\u4e49\u6bd4\u8f83\u51fd\u6570<\/strong>\uff1a\u6211\u4eec\u901a\u8fc7\u5b9e\u73b0\u4e00\u4e2a\u6bd4\u8f83\u51fd\u6570\u6765\u5b9a\u4e49\u5143\u7d20\u7684\u6392\u5e8f\u89c4\u5219\u3002<\/li>\n\n\n\n<li><strong>\u4f7f\u7528 <code>qsort<\/code> \u6392\u5e8f<\/strong>\uff1a\u5c06\u81ea\u5b9a\u4e49\u7684\u6bd4\u8f83\u51fd\u6570\u4f20\u9012\u7ed9 <code>qsort<\/code> \u6765\u6392\u5e8f\u6570\u7ec4\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5b9e\u73b0\u793a\u4f8b\uff1a<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u6574\u6570\u6570\u7ec4\uff0c\u5e76\u5e0c\u671b\u6309\u7167\u5347\u5e8f\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n#include &lt;stdlib.h&gt;\n\n\/\/ \u81ea\u5b9a\u4e49\u6bd4\u8f83\u51fd\u6570\uff0c\u8fd4\u56de\u503c\u7b26\u5408\u4e25\u683c\u5f31\u6392\u5e8f\u8981\u6c42\nint compare(const void *a, const void *b) {\n    int int_a = *((int*)a);\n    int int_b = *((int*)b);\n\n    \/\/ \u6309\u7167\u5347\u5e8f\u6392\u5217\n    if (int_a &lt; int_b) return -1;  \/\/ a &lt; b\n    if (int_a &gt; int_b) return 1;   \/\/ a &gt; b\n    return 0;  \/\/ a == b\n}\n\nint main() {\n    int arr&#91;] = {5, 3, 8, 1, 2};\n    int n = sizeof(arr) \/ sizeof(arr&#91;0]);\n\n    \/\/ \u4f7f\u7528qsort\u8fdb\u884c\u6392\u5e8f\n    qsort(arr, n, sizeof(int), compare);\n\n    \/\/ \u8f93\u51fa\u6392\u5e8f\u540e\u7684\u6570\u7ec4\n    for (int i = 0; i &lt; n; i++) {\n        printf(\"%d \", arr&#91;i]);\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u89e3\u91ca\uff1a<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6bd4\u8f83\u51fd\u6570 <code>compare<\/code><\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>compare<\/code> \u51fd\u6570\u662f\u4e00\u4e2a\u4e25\u683c\u5f31\u6392\u5e8f\u7684\u6bd4\u8f83\u51fd\u6570\u3002\u5982\u679c <code>a &lt; b<\/code>\uff0c\u8fd4\u56de\u8d1f\u503c\uff1b\u5982\u679c <code>a > b<\/code>\uff0c\u8fd4\u56de\u6b63\u503c\uff1b\u5982\u679c\u76f8\u7b49\uff0c\u8fd4\u56de <code>0<\/code>\u3002<\/li>\n\n\n\n<li>\u8fd9\u79cd\u65b9\u5f0f\u786e\u4fdd\u4e86\u6bd4\u8f83\u51fd\u6570\u6ee1\u8db3\u4e25\u683c\u5f31\u6392\u5e8f\u7684\u6761\u4ef6\u3002<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong><code>qsort<\/code> \u6392\u5e8f<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>qsort<\/code> \u51fd\u6570\u63a5\u53d7\u56db\u4e2a\u53c2\u6570\uff1a\u5f85\u6392\u5e8f\u7684\u6570\u7ec4\u3001\u6570\u7ec4\u5143\u7d20\u4e2a\u6570\u3001\u6bcf\u4e2a\u5143\u7d20\u7684\u5927\u5c0f\uff0c\u4ee5\u53ca\u6bd4\u8f83\u51fd\u6570\u3002\u5b83\u4f1a\u6839\u636e\u6211\u4eec\u5b9a\u4e49\u7684\u6bd4\u8f83\u89c4\u5219\u5bf9\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u5176\u4ed6\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7a33\u5b9a\u6027<\/strong>\uff1a\u4e25\u683c\u5f31\u6392\u5e8f\u5e76\u4e0d\u4fdd\u8bc1\u7a33\u5b9a\u6027\uff0c\u5373\u76f8\u7b49\u5143\u7d20\u7684\u76f8\u5bf9\u4f4d\u7f6e\u53ef\u80fd\u4f1a\u6539\u53d8\u3002\u5982\u679c\u9700\u8981\u7a33\u5b9a\u6392\u5e8f\uff0c\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u7b97\u6cd5\uff08\u5982\u5f52\u5e76\u6392\u5e8f\uff09\u3002<\/li>\n\n\n\n<li><strong>\u81ea\u5b9a\u4e49\u6bd4\u8f83<\/strong>\uff1a\u5982\u679c\u9700\u8981\u66f4\u590d\u6742\u7684\u6392\u5e8f\u89c4\u5219\uff08\u4f8b\u5982\u6309\u5b57\u7b26\u4e32\u957f\u5ea6\u3001\u5b57\u5178\u987a\u5e8f\u7b49\uff09\uff0c\u53ef\u4ee5\u4fee\u6539 <code>compare<\/code> \u51fd\u6570\u7684\u5b9e\u73b0\uff0c\u786e\u4fdd\u5b83\u7b26\u5408\u4e25\u683c\u5f31\u6392\u5e8f\u7684\u5b9a\u4e49\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u603b\u7ed3<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e25\u683c\u7684\u5f31\u6392\u5e8f\u662f\u4e00\u79cd\u975e\u5e38\u91cd\u8981\u7684\u6392\u5e8f\u5173\u7cfb\uff0c\u5b83\u786e\u4fdd\u4e86\u6392\u5e8f\u7ed3\u679c\u7684\u4f20\u9012\u6027\u3001\u53cd\u5bf9\u79f0\u6027\u548c\u4e00\u81f4\u6027\u3002\u5728 C \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u6bd4\u8f83\u51fd\u6570\u6765\u5b9e\u73b0\u8fd9\u79cd\u6392\u5e8f\uff0c\u5e76\u4f7f\u7528\u6807\u51c6\u5e93\u51fd\u6570 <code>qsort<\/code> \u6765\u6392\u5e8f\u6570\u7ec4\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u9700\u8981\u5b9e\u73b0\u5404\u79cd\u6392\u5e8f\u903b\u8f91\uff0c\u540c\u65f6\u4fdd\u6301\u6392\u5e8f\u7684\u4e25\u683c\u4e00\u81f4\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e25\u683c\u7684\u5f31\u6392\u5e8f\uff08Strict Weak Ordering\uff09\u662f\u4e00\u79cd\u6392\u5e8f\u5173\u7cfb\uff0c\u901a\u5e38\u7528\u4e8e\u5904\u7406\u6bd4\u8f83\u64cd\u4f5c\u65f6\u3002\u5b83\u8981\u6c42\u5728\u6392\u5e8f\u4e2d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[],"class_list":["post-526","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/526","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=526"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/526\/revisions"}],"predecessor-version":[{"id":527,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/526\/revisions\/527"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=526"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=526"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}