{"id":208,"date":"2023-06-14T18:05:22","date_gmt":"2023-06-14T10:05:22","guid":{"rendered":"https:\/\/www.gzlcy.cn\/?p=208"},"modified":"2023-06-14T18:05:22","modified_gmt":"2023-06-14T10:05:22","slug":"c%e8%af%ad%e8%a8%80%e6%8e%92%e5%ba%8f%e5%87%bd%e6%95%b0qsort%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"http:\/\/www.gzlcy.cn\/?p=208","title":{"rendered":"C\u8bed\u8a00\u6392\u5e8f\u51fd\u6570qsort\u7528\u6cd5"},"content":{"rendered":"

qsort\u51fd\u6570<\/a>\u7b80\u4ecb<\/p>\n

\u6392\u5e8f<\/a>\u65b9\u6cd5\u6709\u5f88\u591a\u79cd\uff1a\u9009\u62e9\u6392\u5e8f\uff0c\u5192\u6ce1\u6392\u5e8f\uff0c\u5f52\u5e76\u6392\u5e8f\uff0c\u5feb\u901f\u6392\u5e8f\u7b49\u3002 \u770b\u540d\u5b57\u90fd\u77e5\u9053\u5feb\u901f\u6392\u5e8f\u662f\u76ee\u524d\u516c\u8ba4\u7684\u4e00\u79cd\u6bd4\u8f83\u597d\u7684\u6392\u5e8f\u7b97\u6cd5\u3002\u56e0\u4e3a\u4ed6\u901f\u5ea6\u5f88\u5feb\uff0c\u6240\u4ee5\u7cfb\u7edf\u4e5f\u5728\u5e93\u91cc\u5b9e\u73b0\u8fd9\u4e2a\u7b97\u6cd5\uff0c\u4fbf\u4e8e\u6211\u4eec\u7684\u4f7f\u7528\u3002 \u8fd9\u5c31\u662fqsort\u51fd\u6570(\u5168\u79f0quicksort)\u3002\u5b83\u662fANSI C\u6807\u51c6\u4e2d\u63d0\u4f9b\u7684\uff0c\u5176\u58f0\u660e\u5728stdlib.h\u6587\u4ef6\u4e2d\uff0c\u662f\u6839\u636e\u4e8c\u5206\u6cd5\u5199\u7684\uff0c\u5176\u65f6\u95f4\u590d\u6742\u5ea6\u4e3an*log(n)<\/p>\n

\u5f85\u6392\u5e8f\u6570\u7ec4<\/a>\uff0c\u6392\u5e8f\u4e4b\u540e\u7684\u7ed3\u679c\u4ecd\u653e\u5728\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u6570\u7ec4\u4e2d\u5f85\u6392\u5e8f\u5143\u7d20\u6570\u91cf\u5404\u5143\u7d20\u7684\u5360\u7528\u7a7a\u95f4\u5927\u5c0f\uff08\u5355\u4f4d\u4e3a\u5b57\u8282\uff09\u6307\u5411\u51fd\u6570\u7684\u6307\u9488<\/a>\uff0c\u7528\u4e8e\u786e\u5b9a\u6392\u5e8f\u7684\u987a\u5e8f\uff08\u9700\u8981\u7528\u6237\u81ea\u5b9a\u4e49\u4e00\u4e2a\u6bd4\u8f83\u51fd\u6570\uff09<\/p>\n

qsort\u8981\u6c42\u63d0\u4f9b\u4e00\u4e2a\u81ea\u5df1\u5b9a\u4e49\u7684\u6bd4\u8f83\u51fd\u6570\u3002\u6bd4\u8f83\u51fd\u6570\u4f7f\u5f97qsort\u901a\u7528\u6027\u66f4\u597d\uff0c\u6709\u4e86\u6bd4\u8f83\u51fd\u6570qsort\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u6570\u7ec4\u3001\u5b57\u7b26\u4e32\u3001\u7ed3\u6784\u4f53\u7b49\u7ed3\u6784\u8fdb\u884c\u5347\u5e8f\u6216\u964d\u5e8f\u6392\u5e8f\u3002<\/p>\n

\u5982\u6bd4\u8f83\u51fd\u6570 int cmp(const void *a, const void *b) \u4e2d\u6709\u4e24\u4e2a\u5143\u7d20\u4f5c\u4e3a\u53c2\u6570\uff08\u53c2\u6570\u7684\u683c\u5f0f\u4e0d\u80fd\u53d8\uff09\uff0c\u8fd4\u56de<\/a>\u4e00\u4e2aint\u503c\uff0c\u6bd4\u8f83\u51fd\u6570cmp\u7684\u4f5c\u7528\u5c31\u662f\u7ed9qsort\u6307\u660e\u5143\u7d20\u7684\u5927\u5c0f\u662f\u600e\u4e48\u6bd4\u8f83\u7684\u3002<\/p>\n

\u5bf9int\u578b\u6570\u7ec4\u6392\u5e8f<\/p>\n

int<\/span> num[<\/span>100<\/span>]<\/span>;<\/span>\nint<\/span> cmp_int<\/span>(<\/span>const<\/span> void<\/span>*<\/span> a,<\/span> const<\/span> void<\/span>*<\/span> b)<\/span>\u3000\u3000\/\/\u53c2\u6570\u683c\u5f0f\u56fa\u5b9a<\/span>\n{<\/span>\n    return<\/span> *<\/span>(<\/span>int<\/span> *<\/span>)<\/span>a -<\/span> *<\/span>(<\/span>int<\/span> *<\/span>)<\/span>b;<\/span>\u3000\u3000\n}<\/span>\nqsort<\/span>(<\/span>num,<\/span> 100<\/span>,<\/span> sizeof<\/span>(<\/span>num[<\/span>0<\/span>]<\/span>)<\/span>,<\/span> cmp_int)<\/span>;<\/span> \n<\/code><\/pre>\n<\/p>\n
\u53ef\u89c1\uff0c\u53c2\u6570\u5217\u8868\u662f\u4e24\u4e2a\u7a7a\u6307\u9488\uff0c\u73b0\u5728\u4ed6\u8981\u53bb\u6307\u5411\u4f60\u7684\u6570\u7ec4\u5143\u7d20\u3002\u6240\u4ee5\u8f6c\u6362\u4e3a\u4f60\u5f53\u524d\u7684\u7c7b\u578b\uff0c\u7136\u540e\u53d6\u503c\u3002\u9ed8\u8ba4\u5347\u5e8f\u6392\u5217(\u4ece\u5c0f\u5230\u5927)\uff0c\u5982\u679c\u60f3\u964d\u5e8f\u6392\u5217\u8fd4\u56de*b-*a\u5373\u53ef\u3002<\/p>\n
\u5bf9char\u578b\u6570\u7ec4\u6392\u5e8f\uff08\u540cint\u7c7b\u578b\uff09<\/p>\n
char<\/span> word[<\/span>100<\/span>]<\/span>;<\/span>\nint<\/span> cmp_char<\/span>(<\/span>const<\/span> void<\/span>*<\/span> a,<\/span> const<\/span> void<\/span>*<\/span> b)<\/span>\u3000\u3000\/\/\u53c2\u6570\u683c\u5f0f\u56fa\u5b9a<\/span>\n{<\/span>\n    return<\/span> *<\/span>(<\/span>char<\/span> *<\/span>)<\/span>a -<\/span> *<\/span>(<\/span>char<\/span> *<\/span>)<\/span>b;<\/span>\u3000\u3000\n}<\/span>\nqsort<\/span>(<\/span>word,<\/span> 100<\/span>,<\/span> sizeof<\/span>(<\/span>word[<\/span>0<\/span>]<\/span>)<\/span>,<\/span> cmp_char)<\/span>;<\/span> \n<\/code><\/pre>\n<\/p>\n
\u5bf9double\u578b\u6570\u7ec4\u6392\u5e8f<\/p>\n
double<\/span> in[<\/span>100<\/span>]<\/span>;<\/span>\nint<\/span> cmp_double<\/span>(<\/span>const<\/span> void<\/span>*<\/span> a,<\/span> const<\/span> void<\/span>*<\/span> b)<\/span>\u3000\u3000\/\/\u53c2\u6570\u683c\u5f0f\u56fa\u5b9a<\/span>\n{<\/span>\n    return<\/span> *<\/span>(<\/span>double<\/span> *<\/span>)<\/span>a ><\/span> *<\/span>(<\/span>double<\/span> *<\/span>)<\/span>b ?<\/span> 1<\/span> :<\/span> -<\/span>1<\/span>;<\/span>\u3000  \/\/\u7279\u522b\u6ce8\u610f<\/span>\n}<\/span>\nqsort<\/span>(<\/span>in,<\/span> 100<\/span>,<\/span> sizeof<\/span>(<\/span>in[<\/span>0<\/span>]<\/span>)<\/span>,<\/span> cmp_double)<\/span>;<\/span> \n<\/code><\/pre>\n<\/p>\n
\u6ce8\u610f \u5728\u5bf9\u6d6e\u70b9\u6216\u8005double\u578b\u7684\u4e00\u5b9a\u8981\u7528\u4e09\u76ee\u8fd0\u7b97\u7b26 \uff0c\u56e0\u4e3a\u8981\u662f\u4f7f\u7528\u50cf\u6574\u578b\u90a3\u6837\u76f8\u51cf\u7684\u8bdd\uff0c\u5982\u679c\u662f\u4e24\u4e2a\u5f88\u63a5\u8fd1\u7684\u6570\u5219\u53ef\u80fd\u8fd4\u56de\u4e00\u4e2a\u5f88\u5c0f\u7684\u5c0f\u6570\uff08\u5927\u4e8e-1\uff0c\u5c0f\u4e8e1\uff09\uff0c\u800ccmp\u7684\u8fd4\u56de\u503c\u662fint\u578b\uff0c\u56e0\u6b64\u4f1a\u5c06\u8fd9\u4e2a\u5c0f\u6570\u8fd4\u56de0\uff0c\u7cfb\u7edf\u8ba4\u4e3a\u662f\u76f8\u7b49\uff0c\u5931\u53bb\u4e86\u672c\u6765\u5b58\u5728\u7684\u5927\u5c0f\u5173\u7cfb<\/p>\n
\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u6392\u5e8f<\/p>\n
char<\/span> word[<\/span>100<\/span>]<\/span>[<\/span>10<\/span>]<\/span>;<\/span>\nint<\/span> cmp_string<\/span>(<\/span>const<\/span> void<\/span>*<\/span> a,<\/span> const<\/span> void<\/span>*<\/span> b)<\/span>\u3000\u3000\/\/\u53c2\u6570\u683c\u5f0f\u56fa\u5b9a<\/span>\n{<\/span>\n    return<\/span> strcmp<\/span>(<\/span>(<\/span>char<\/span> *<\/span>)<\/span>a,<\/span> (<\/span>char<\/span> *<\/span>)<\/span>b)<\/span>;<\/span>\n}<\/span>\nqsort<\/span>(<\/span>word,<\/span> 100<\/span>,<\/span> sizeof<\/span>(<\/span>word[<\/span>0<\/span>]<\/span>)<\/span>,<\/span> cmp_string)<\/span>;<\/span> \n<\/code><\/pre>\n<\/p>\n
\u539f\u6587\u94fe\u63a5\uff1a<\/p>\n","protected":false},"excerpt":{"rendered":"
qsort\u51fd\u6570(\u5168\u79f0quicksort)\u3002\u5b83\u662fANSI C\u6807\u51c6\u4e2d\u63d0\u4f9b\u7684\uff0c\u5176\u58f0\u660e\u5728stdlib.h\u6587\u4ef6\u4e2d\uff0c\u662f\u6839\u636e\u4e8c\u5206\u6cd5\u5199\u7684\uff0c\u5176\u65f6\u95f4\u590d\u6742\u5ea6\u4e3an*log(n)<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[254,262,210,255,256],"_links":{"self":[{"href":"http:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/posts\/208"}],"collection":[{"href":"http:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.gzlcy.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=208"}],"version-history":[{"count":0,"href":"http:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/posts\/208\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.gzlcy.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gzlcy.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=208"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gzlcy.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}