{"id":2434,"date":"2019-11-13T20:55:33","date_gmt":"2019-11-13T12:55:33","guid":{"rendered":"http:\/\/www.sniper97.cn\/?p=2434"},"modified":"2019-11-13T20:55:33","modified_gmt":"2019-11-13T12:55:33","slug":"%e3%80%90%e7%ae%97%e6%b3%95%e5%88%86%e6%9e%90%e4%b8%8e%e8%ae%be%e8%ae%a1%e3%80%91%e7%ba%bf%e6%80%a7%e6%97%b6%e9%97%b4%e6%8e%92%e5%ba%8f","status":"publish","type":"post","link":"http:\/\/www.sniper97.cn\/index.php\/note\/introduction_to_algorithms\/2434\/","title":{"rendered":"\u3010\u7b97\u6cd5\u5bfc\u8bba\u3011\u7ebf\u6027\u65f6\u95f4\u6392\u5e8f"},"content":{"rendered":"\n

1 \u8ba1\u6570\u6392\u5e8f<\/h2>\n\n\n

\u8ba1\u6570\u6392\u5e8f<\/strong>\u5047\u8bben\u548c\u8f93\u5165\u5143\u7d20\u4e2d\u7684\u6bcf\u4e00\u4e2a\u90fd\u662f\u57280\u5230k\u533a\u95f4\u5185\u7684\u4e00\u4e2a\u6574\u6570\uff0c\u5176\u4e2dk\u4e3a\u67d0\u4e2a\u6574\u6570\u3002\u5f53k=O(n)\u65f6\uff0c\u6392\u5e8f\u7684\u8fd0\u884c\u65f6\u95f4\u4e3aTheta(n)\u3002<\/p>\n\n\n

\u8ba1\u6570\u6392\u5e8f\u7684\u601d\u60f3\u662f\u6bcf\u8f93\u5165\u4e00\u4e2a\u5143\u7d20x\uff0c\u786e\u5b9a\u5c0f\u4e8ex\u7684\u4e2a\u6570\u3002\u5229\u7528\u8fd9\u4e00\u4fe1\u606f\uff0c\u5c31\u53ef\u4ee5\u76f4\u63a5\u628ax\u653e\u5230\u5b83\u7684\u8f93\u51fa\u6570\u7ec4\u4e2d\u5bf9\u5e94\u7684\u4f4d\u7f6e\u4e86\uff08\u5f53\u7136\u5728\u6709\u91cd\u590d\u6570\u636e\u7684\u60c5\u51b5\u4e0b\u8981\u505a\u4e00\u70b9\u4fee\u6539\uff09\u3002<\/p>\n\n\n

\u5f88\u663e\u7136\uff0c\u8ba1\u6570\u6392\u5e8f\u53c8\u4e00\u4e2a\u7f3a\u70b9\u5c31\u662f\u5f53\u9700\u8981\u6392\u5e8f\u7684\u6570\u503c\u5f88\u5927\u65f6\uff0c\u7a7a\u95f4\u6d6a\u8d39\u975e\u5e38\u5927\u3002\u800c\u4e14\u4e0d\u80fd\u6392\u5e8f\u975e\u6574\u6570\u3002<\/p>\n\n\n

\"\"<\/figure><\/div>\n\n\n

\u4e0b\u9762\u662f\u4f2a\u7801\uff1a<\/p>\n\n\n

\"\"<\/figure><\/div>\n\n\n

\u4ee3\u7801\uff1a<\/p>\n\n\n

def count_sort(self, init_list):
    \"\"\"
<\/em>    \u8ba1\u6570\u6392\u5e8f
<\/em>    <\/em>:param<\/em><\/strong> init_list: \u9700\u8981\u88ab\u6392\u5e8f\u7684\u5217\u8868
<\/em>    <\/em>:return<\/em><\/strong>:
<\/em>    \"\"\"
<\/em>    <\/em>max_num = max(init_list)
    # \u521d\u59cb\u5316\u8f85\u52a9\u5217\u8868\uff0c\u4e3a\u4e86\u5bf9\u9f50\u6392\u5e8f\u5143\u7d20\uff0c0 index\u4e0d\u7528\uff0c\u6240\u4ee5+1
    assist_list = [0 for _ in range(max_num + 1)]
    # \u8ba1\u7b97\u5143\u7d20\u4e2a\u6570
    for each in init_list:
        assist_list[each] += 1
    # \u76f8\u52a0
    for i in range(len(assist_list) - 1):
        assist_list[i + 1] += assist_list[i]
    # \u6062\u590dinit_list\u6570\u7ec4
    for i in range(len(assist_list) - 1, -1, -1):
        while assist_list[i] != 0:
            init_list[assist_list[i]-1] = i
            assist_list[i] -= 1
    return init_list<\/pre>\n\n\n
2.\u57fa\u6570\u6392\u5e8f<\/h2>\n\n\n
\u57fa\u6570\u6392\u5e8f\u901a\u8fc7\u5bf9\u6bcf\u4e00\u4f4d\u8fdb\u884c\u6392\u5e8f\u4ece\u800c\u5b8c\u6210\u6574\u4f53\u7684\u6392\u5e8f\u3002<\/p>\n\n\n
\"\"<\/figure><\/div>\n\n\n
\u4f2a\u7801\uff1a<\/p>\n\n\n
\"\"<\/figure><\/div>\n\n\n
\u4ee3\u7801\uff1a<\/p>\n\n\n
def radix_sort(self, init_list):
    \"\"\"
<\/em>    \u57fa\u6570\u6392\u5e8f
<\/em>    <\/em>:param<\/em><\/strong> init_list: \u6392\u5e8f\u5217\u8868
<\/em>    <\/em>:return<\/em><\/strong>:
<\/em>    \"\"\"
<\/em>    <\/em># \u6700\u5927\u6570\u5b57
    max_num = max(init_list)
    # \u6700\u5927\u4f4d\u6570
    max_loop = len(str(max_num))
    # int \u8f6c str\u5e76\u8865\u96f6
    init_list_str = []
    for each in init_list:
        init_list_str.append(str(each).rjust(max_loop, '0'))
    # \u83b7\u53d6x\u4f4d\u7684\u503c\u5e76\u6392\u5e8f
    for i in range(max_loop - 1, -1, -1):
        sort_num = []
        # \u83b7\u53d6\u4f4d\u6570
        for j in range(len(init_list)):
            sort_num.append(init_list_str[j][i])
        # \u8fdb\u884c\u5192\u6ce1\u6392\u5e8f
        for ii in range(len(init_list_str)):
            for jj in range(ii, len(init_list_str)):
                if sort_num[ii] > sort_num[jj]:
                    # \u4ea4\u6362sort_num\u4ee5\u53cainit_list_str\u7684\u503c
                    temp = sort_num[ii]
                    sort_num[ii] = sort_num[jj]
                    sort_num[jj] = temp
                    temp = init_list_str[ii]
                    init_list_str[ii] = init_list_str[jj]
                    init_list_str[jj] = temp
    # str \u8f6c\u56de int
    return [int(i) for i in init_list_str]<\/pre>\n","protected":false},"excerpt":{"rendered":"
1 \u8ba1\u6570\u6392\u5e8f \u8ba1\u6570\u6392\u5e8f\u5047\u8bben\u548c\u8f93\u5165\u5143\u7d20\u4e2d\u7684\u6bcf\u4e00\u4e2a\u90fd\u662f\u57280\u5230k\u533a\u95f4\u5185\u7684\u4e00\u4e2a\u6574\u6570\uff0c\u5176\u4e2dk\u4e3a\u67d0\u4e2a\u6574\u6570\u3002\u5f53k […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[11],"tags":[],"views":3937,"_links":{"self":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/2434"}],"collection":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2434"}],"version-history":[{"count":0,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/2434\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2434"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2434"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}