{"id":1027,"date":"2019-09-07T16:52:27","date_gmt":"2019-09-07T08:52:27","guid":{"rendered":"https:\/\/wyxxt.org.cn\/?p=1027"},"modified":"2023-12-04T15:51:59","modified_gmt":"2023-12-04T07:51:59","slug":"php%e5%9f%ba%e7%a1%80-%e6%8e%92%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/wyxxt.org.cn\/?p=1027","title":{"rendered":"PHP\u57fa\u7840\u2014\u2014\u6392\u5e8f"},"content":{"rendered":"

1\u3001\u5192\u6ce1\u6392\u5e8f Bubble Sort<\/h3>\n

\u6392\u961f\uff0c\u4f9d\u6b21\u4ea4\u6362<\/p>\n

$arr = [1,4,2,9,7,5,8];\n\n\/\/2\u3001 \u8ba9\u4e0b\u9762\u7684\u53ef\u4ee5\u6bcf\u6b21\u627e\u51fa\u6700\u5927\u503c\u7684\u4ee3\u7801\u91cd\u590d\u6267\u884c\nfor($i =0, $len = count($arr); $i < $len; $i++) {\n    \/\/1\u3001\u5c06\u6700\u5927\u7684\u653e\u5230\u6700\u53f3\u8fb9\n    for($j = 0; $j < $len - 1 - $i; $j++ ) {\n        \/\/\u5224\u65ad\uff1a\u4e24\u4e24\u76f8\u6bd4\n        if($arr[$j] > $arr[$j+1]) {\n            \/\/\u5de6\u8fb9\u6bd4\u53f3\u8fb9\u5927:\u4ea4\u6362\n            $temp = $arr[$j];\n            $arr[$j] = $arr[$j+1];\n            $arr[$j+1] = $temp;\n        }\n    }\n}\n\n\n<\/code><\/pre>\n
2\u3001\u9009\u62e9\u6392\u5e8f Selection sort<\/h3>\n
\u4e0d\u7a33\u5b9a<\/strong> [5, 5, 3] \u7b2c\u4e00\u6b21\u5c06[5]\u548c[3]\u4ea4\u6362\uff0c\u5bfc\u81f4\u7b2c\u4e00\u4e2a5\u5230\u7b2c\u4e8c\u4e2a5\u540e\u9762
\n\u6bcf\u6b21\u4ece\u5f85\u6392\u5e8f\u6570\u636e\u5143\u7d20\u4e2d\u6311\u9009\u51fa\u6700\u5c0f\u5143\u7d20\uff0c\u5b58\u653e\u5728\u5e8f\u5217\u7684\u8d77\u59cb\u4f4d\u7f6e<\/p>\n
$arr = [1,5,2,9,3,4];\n\n\/\/1\u3001 \u786e\u5b9a\u8981\u4ea4\u6362\u591a\u5c11\u6b21\uff1a\u4e00\u6b21\u53ea\u80fd\u627e\u5230\u4e00\u4e2a\u6700\u5c0f\u7684\uff0c\u9700\u8981\u627e\u6570\u7ec4\u957f\u5ea6\u5bf9\u5e94\u7684\u6b21\u6570\nfor($i = 0,$len = count($arr); $i < $len; $i++) {\n    \/\/2\u3001 \u5047\u8bbe\u5f53\u524d\u7b2c\u4e00\u4e2a\u5df2\u7ecf\u6392\u597d\u5e8f\u4e86\n    $min = $i; \/\/\u5f53\u524d\u7b2c\u4e00\u4e2a\u6570\u662f\u6700\u5c0f\u7684\n    \/\/3\u3001 \u62ff\u8be5\u6700\u5c0f\u7684\u6bd4\u8f83\u5269\u4f59\u7684\u5176\u4ed6\n    for($j = $i + 1; $j < $len; $j++) {\n        \/\/4\u3001 \u6bd4\u8f83\uff1a\u6bd4\u8f83\u5f53\u524d\u5143\u7d20\u4e0e\u9009\u5b9a\u7684\u6700\u5c0f\u5143\u7d20\n        if($arr[$j] < $arr[$min]) {\n            \/\/\u8bf4\u660e\u5f53\u524d\u6307\u5b9a\u7684$min\u4e0d\u5408\u9002\n            $min = $j;\n        }\n    }\n    \/\/5\u3001 \u4ea4\u6362\u5f53\u524d\u9009\u5b9a\u7684\u503c\u4e0e\u5b9e\u9645\u6700\u5c0f\u7684\u5143\u7d20\u503c\n    if($min != $i) {\n        $temp = $arr[$i];\n        $arr[$i] = $arr[$min];\n        $arr[$min] = $temp;\n    }\n}\n<\/code><\/pre>\n
3\u3001\u63d2\u5165\u6392\u5e8f Insert sort<\/h3>\n
\u4f7f\u7528\u5c11\u91cf\u6570\u636e\u6392\u5e8f\uff0c\u7a33\u5b9a<\/p>\n
$arr = [4,2,6,8,9,5];\n\n\/\/1\u3001 \u786e\u5b9a\u8981\u63d2\u5165\u591a\u5c11\u56de(\u5047\u8bbe\u4e00\u4e2a\u6570\u5b57\u4e00\u6b21\u6027\u51fa\u5165\u5bf9\u7684\u4f4d\u7f6e\uff0c\u540c\u65f6\u7b2c\u4e00\u4e2a\u4f4d\u7f6e\u662f\u5bf9\u7684)\nfor($i = 1,$len = count($arr); $i < $len; $i++) {\n    \/\/2\u3001 \u53d6\u51fa\u5f53\u524d\u8981\u63d2\u5165\u7684\u5143\u7d20\u7684\u503c\n    $temp = $arr[$i];\n    \/\/\u6807\u8bb0\uff1a \u9ed8\u8ba4\u8bf4\u660e\u5f53\u524d\u8981\u63d2\u5165\u7684\u6570\u7ec4\u7684\u4f4d\u7f6e\u662f\u5bf9\u7684\n    $change = fales;\n    \/\/3\u3001 \u8ba9\u8be5\u6570\u636e\u4e0e\u524d\u9762\u5df2\u7ecf\u6392\u597d\u5e8f\u7684\u5143\u7d20\u91cd\u590d\u6bd4\u8f83\uff08\u6328\u4e2a\u6bd4\u8f83\uff09\uff0c\u77e5\u9053\u5bf9\u7684\u4f4d\u7f6e\uff08\u4ea4\u6362\uff09\n    for($j = $i - 1; $j >=0; $j--) {\n        \/\/4\u3001 \u6bd4\u8f83\n        if($arr[$j] > $temp) {\n            \/\/\u8bf4\u660e\u5f53\u524d\u8981\u63d2\u5165\u7684\u5143\u7d20\uff0c\u6bd4\u524d\u9762\u7684\u5df2\u7ecf\u6392\u597d\u5e8f\u7684\u5143\u7d20\u503c\u5c0f\uff1a\u4ea4\u6362\u4f4d\u7f6e\n            $arr[$j+1] = $arr[$j];\n            \/\/$arr[$j] = $temp;\n            \/\/ \u8bf4\u660e\u524d\u9762\u987a\u5e8f\u7684\u6570\u7ec4\u5143\u7d20\u6709\u4e0d\u5408\u9002\u7684\u4f4d\u7f6e\n            $change = true;\n        }else{\n            \/\/\u8bf4\u660e\u5f53\u524d\u5f85\u63d2\u5165\u5143\u7d20\uff0c\u6bd4\u524d\u9762\u5143\u7d20\u5927\uff1a\u8bf4\u660e\u4f4d\u7f6e\u6b63\u786e\n            break;\n        }\n    }\n    \/\/\u5224\u65ad\u4f4d\u7f6e\u662f\u5426\u9700\u8981\u53d8\u52a8\n    if($change) {\n        \/\/\u6709\u6570\u636e\u79fb\u52a8\uff1a\u7ad9\u9519\u4f4d\u7f6e\u4e86\n        $arr[$j+1] = $temp;\n    }\n}\n<\/code><\/pre>\n
4\u3001\u5feb\u901f\u6392\u5e8f Quicksort<\/h3>\n
\u5bf9\u5192\u6ce1\u6392\u5e8f\u7684\u6539\u8fdb  \u4e0d\u7a33\u5b9a \uff08\u9012\u5f52\uff09<\/p>\n
$arr = [5,6,3,4,9,2,7,8];\n\n\/\/ \u5feb\u901f\u6392\u5e8f\nfunction quick_sort($arr) {\n    \/\/\u9012\u5f52\u51fa\u53e3\n    $len = count($arr);\n    if($len <= 1) return $arr;\n\n    \/\/\u53bb\u9664\u67d0\u4e2a\u5143\u7d20\uff0c\u5c06\u5269\u4f59\u7684\u6570\u7ec4\u5143\u7d20\u5206\u6563\u5230\u4e24\u4e2a\u4e0d\u540c\u7684\u6570\u7ec4\u4e2d\n    $left = $right = [];\n    for($i = 1; $i < $len; $i++) {\n        \/\/\u7b2c\u4e00\u4e2a\u5143\u7d20\u4f5c\u4e3a\u6bd4\u8f83\u5143\u7d20\n        \/\/\u6bd4\u8f83\uff1a\u5c0f\u7684\u653eleft\u4e2d\uff0c\u5927\u7684\u653eright\u4e2d\n        if($arr[$i] < $arr[0]) {\n            $left[] = $arr[$i];\n        }else{\n            $right[] = $arr[$i];\n        }\n    }\n    \/\/$left\u548c$righ\u6570\u7ec4\u5143\u7d20\u6ca1\u6709\u6392\u597d\u5e8f:\u9012\u5f52\u70b9\n    $left = quick_sort($left);\n    $right = quick_sort($right);\n    \/\/ \u5408\u5e76\u4e09\u4e2a\"\u6570\u7ec4\"\n    return array_merge($left, (array)$arr[0], $right);\n}\n<\/code><\/pre>\n
5\u3001\u5f52\u5e76\u6392\u5e8f MERGE-SORT<\/h3>\n
\u91c7\u7528\u5206\u6cbb\u6cd5 Divide and Conquer<\/p>\n
\/\/ \u4e8c\u8def\u5f52\u5e76\n$arr1 = [1,3,5];\n$arr2 = [2,4,6];\n\n\/\/\u53bb\u9664\u4e00\u4e2a\u7a7a\u6570\u7ec4\u7528\u4e8e\u5f52\u5e76\u7a7a\u95f4\n$arr3 = [];\nwhile(count($arr1) && count($arr2)) {\n    \/\/\u53ea\u8981$arr1\u548c$arr2\u91cc\u9762\u8fd8\u6709\u5143\u7d20\uff0c\u5c31\u8fdb\u884c\u5faa\u73af\n    \/\/\u53bb\u9664\u6bcf\u4e2a\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\uff1a\u8fdb\u884c\u6bd4\u8f83\n    $arr3[] = $arr1[0] < $arr2[0] ? array_shitf($arr1) : array_shift($arr2);\n}\n\n\/\/\u5408\u5e76\u7ed3\u679c\narray_merge($arr3, $arr1, $arr2);\n<\/code><\/pre>\n
$arr = [4,7,2,1,5,9,3];\n\/\/\u5f52\u5e76\u6392\u5e8f\u51fd\u6570\nfunction merge_sort($arr) {\n    \/\/\u9012\u5f52\u51fa\u53e3\n    $len = count($arr);\n    if($len <= 1) return $arr;\n    \/\/\u62c6\u5206\n    $middle = floor($len \/ 2);\n    $left = array_slice($arr, 0, $middle);\n    $right = array_slice($arr, $middle);\n\n    \/\/\u9012\u5f52\u70b9\uff1a$left\u548c$right\u90fd\u6ca1\u6709\u6392\u597d\u5e8f\uff1a\u800c\u4e14\u53ef\u80fd\u662f\u591a\u4e2a\u5143\u7d20\u7684\u6570\u7ec4\n    $left = merge_sort($left);\n    $right = merge_sort($right);\n\n    \/\/\u5047\u8bbe\u5de6\u8fb9\u548c\u53f3\u8fb9\u90fd\u5df2\u7ecf\u6392\u597d\u5e8f\uff1a\u4e8c\u8def\u5f52\u5e76\n    $m = [];\n    while(count($left) && count($right)) {\n        \/\/\u53ea\u8981$arr1\u548c$arr2\u91cc\u9762\u8fd8\u6709\u5143\u7d20\uff0c\u5c31\u8fdb\u884c\u5faa\u73af\n        \/\/\u53bb\u9664\u6bcf\u4e2a\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\uff1a\u8fdb\u884c\u6bd4\u8f83\n        $m[] = $left[0] < $right[0] ? array_shitf($left) : array_shift($right);\n        \/\/\u8fd4\u56de\u7ed3\u679c\n    }\n    return array_merge($m, $left, $right);\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
1\u3001\u5192\u6ce1\u6392\u5e8f Bubble Sort \u6392\u961f\uff0c\u4f9d\u6b21\u4ea4\u6362 $arr = [1,4,2,9,7,5,8]; \/\/2\u3001 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[405],"class_list":["post-1027","post","type-post","status-publish","format-standard","hentry","category-15","tag-php"],"_links":{"self":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/1027","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1027"}],"version-history":[{"count":3,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/1027\/revisions"}],"predecessor-version":[{"id":1283,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/1027\/revisions\/1283"}],"wp:attachment":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1027"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1027"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}