{"id":1533,"date":"2023-06-27T13:54:14","date_gmt":"2023-06-27T05:54:14","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=1533"},"modified":"2023-06-27T13:54:14","modified_gmt":"2023-06-27T05:54:14","slug":"%e3%80%90%e7%ae%97%e6%b3%95%e9%a2%98%e8%a7%a3%e3%80%913-%e9%a2%a0%e5%80%92%e4%ba%8c%e8%bf%9b%e5%88%b6%e4%bd%8d","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/%e7%ae%97%e6%b3%95\/%e3%80%90%e7%ae%97%e6%b3%95%e9%a2%98%e8%a7%a3%e3%80%913-%e9%a2%a0%e5%80%92%e4%ba%8c%e8%bf%9b%e5%88%b6%e4%bd%8d\/","title":{"rendered":"\u3010\u7b97\u6cd5\u9898\u89e3\u30113. \u98a0\u5012\u4e8c\u8fdb\u5236\u4f4d"},"content":{"rendered":"
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\u9898\u76ee<\/span><\/span><\/h2>\n

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\u98a0\u5012\u7ed9\u5b9a\u7684 32 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\u7684\u4e8c\u8fdb\u5236\u4f4d\u3002<\/section>\n<\/section>\n
\u6765\u81ea\uff1ahttps:\/\/leetcode.cn\/problems\/reverse-bits\/description\/<\/span><\/section>\n<\/blockquote>\n


<\/p>\n

\u89e3\u6cd5\u4e00<\/span><\/span><\/h2>\n
\u89e3\u9898\u601d\u8def<\/span>
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  1. \n

    \u53d6 n \u7684\u6700\u4f4e\u4f4d\uff0c\u8d4b\u503c\u7ed9 ans \u7684\u6700\u4f4e\u4f4d\uff08ans \u521d\u59cb\u503c\u4e3a0\uff09\u3002<\/span><\/p>\n<\/li>\n<\/ol>\n

    2. \u7136\u540e n \u5411\u540e\u79fb\u52a8\u4e00\u4f4d\uff0cans \u5411\u524d\u79fb\u52a8\u4e00\u4f4d\uff0c\u91cd\u590d\u6b65\u9aa41\uff0c\u76f4\u5230\u53d6\u5b8c n \u7684\u6240\u6709\u4f4d\u7f6e\u3002<\/span><\/p>\n


    <\/span><\/p>\n

    \u4ee3\u7801\u5b9e\u73b0<\/span><\/p>\n

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      public<\/span> class<\/span> Solution<\/span> {<\/span><\/code>    \/\/ you need treat n as an unsigned value<\/span><\/span><\/code>    public<\/span> int<\/span> reverseBits<\/span>(int<\/span> n<\/span>)<\/span> {<\/span><\/code>        int<\/span> ans = n & 1<\/span>;<\/span><\/code>        for<\/span>(int<\/span> i = 0<\/span>; i < 31<\/span>; i++){<\/span><\/code>            n = n >>> 1<\/span>;<\/span><\/code>            ans = ans << 1<\/span>;<\/span><\/code>            ans |= n & 1<\/span>;<\/span><\/code>            <\/span><\/code>        }<\/span><\/code>        return<\/span> ans;<\/span><\/code>    }<\/span><\/code>}<\/span><\/code><\/pre>\n<\/section>\n
      \u590d\u6742\u5ea6\u5206\u6790<\/span><\/section>\n
      \u65f6\u95f4\u590d\u6742\u5ea6 O(n)\uff1an \u4e3a\u4e8c\u8fdb\u5236\u4f4d\u7684\u4e2a\u6570\uff0c\u8fd9\u91cc\u4e3a32\u3002<\/span><\/p>\n
      \u7a7a\u95f4\u590d\u6742\u5ea6 O(1)\u3002<\/span><\/p>\n

      <\/p>\n
      \u89e3\u6cd5\u4e8c<\/span><\/span><\/h2>\n
      \u89e3\u9898\u601d\u8def<\/span><\/section>\n
      \u4ece n \u7684\u6700\u4f4e\u4f4d\u5f00\u59cb\u4e00\u4f4d\u4e00\u4f4d\u7684\u53d6\uff0c\u7136\u540e\u5c06\u53d6\u5230\u7684\u503c\u4ece ans \u7684\u6700\u9ad8\u4f4d\u5f00\u59cb\u4e00\u4f4d\u4e00\u4f4d\u7684\u653e\uff0cans \u7684\u521d\u59cb\u503c\u4e3a0\u3002<\/span><\/section>\n

      <\/span><\/section>\n
      \u7528<\/span>n & 1<\/span>\u83b7\u53d6\u5230 n \u5f53\u524d\u7684\u6700\u540e\u4e00\u4f4d\uff0c\u8d4b\u503c\u7ed9 ans \u7684\u6700\u9ad8\u4f4d\u3002\u7136\u540e\u5c06 n \u53f3\u79fb 1 \u4f4d\uff0c\u518d\u7528 <\/span>n & 1<\/span> \u5c31\u53ef\u4ee5\u53d6\u5230 n \u7684\u5012\u6570\u7b2c\u4e8c\u4f4d\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\u76f4\u5230\u53d6\u5b8c n \u7684\u6700\u9ad8\u4f4d\u7684 1 \u4e4b\u540e\uff0c\u7531\u4e8e\u5269\u4e0b\u7684\u4f4d\u7f6e\u90fd\u662f 0 \uff0c\u548c ans \u7684\u521d\u59cb\u503c\u662f\u4e00\u6837\u7684\u65e0\u9700\u8ba1\u7b97\uff0c\u5219\u53ef\u4ee5\u76f4\u63a5\u7ed3\u675f\u3002<\/span><\/section>\n

      <\/span><\/section>\n
      \u4ee5 <\/span>n = 0001 1100 1101 0100<\/span> \u4e3a\u4f8b\uff0c\u7ed3\u679c\u4e3a\uff1a<\/span>ans = 0010 1011 0011 1000<\/span>\u3002<\/span><\/section>\n

      <\/span><\/section>\n
      \u4ee3\u7801\u5b9e\u73b0<\/span><\/p>\n
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        public<\/span> class<\/span> Solution<\/span> {<\/span><\/code>    \/\/ you need treat n as an unsigned value<\/span><\/span><\/code>    public<\/span> int<\/span> reverseBits<\/span>(int<\/span> n<\/span>)<\/span> {<\/span><\/code>        <\/span><\/code>        int<\/span> ans = 0<\/span>;<\/span><\/code>        for<\/span>(int<\/span> i = 0<\/span>; i < 32<\/span> && n != 0<\/span>; i++){<\/span><\/code>            ans |= (n & 1<\/span>) << (31<\/span> - i);<\/span><\/code>            n = n >>> 1<\/span>;<\/span><\/code>        }<\/span><\/code>        <\/span><\/code>        return<\/span> ans;<\/span><\/code>    }<\/span><\/code>}<\/span><\/code><\/pre>\n<\/section>\n
        \u590d\u6742\u5ea6\u5206\u6790<\/span><\/section>\n
        \u65f6\u95f4\u590d\u6742\u5ea6 O(logn)\uff1a\u65f6\u95f4\u590d\u6742\u5ea6\u53d6\u51b3\u4e8e n \u4e2d\u6700\u9ad8\u4e3a1\u7684\u4f4d\u7f6e\uff0c\u5373 logn \u5411\u4e0b\u53d6\u6574 + 1\u3002<\/span><\/p>\n
        \u7a7a\u95f4\u590d\u6742\u5ea6 O(1)\u3002<\/span><\/p>\n

        <\/p>\n
        \u89e3\u6cd5\u4e09<\/span><\/span><\/h2>\n
        \u89e3\u9898\u601d\u8def<\/span><\/span><\/section>\n
        \u4f7f\u7528\u5206\u6cbb\u7684\u601d\u60f3\uff1a<\/span><\/p>\n
        1. \u5c0632\u4f4d\u4e8c\u8fdb\u5236\u4f4d\u5206\u4e3a2\u4e2a16\u4f4d\u7684\u4e8c\u8fdb\u5236\u4f4d\uff0c\u5206\u522b\u98a0\u50122\u4e2a16\u4f4d\u7684\u4e8c\u8fdb\u5236\u4f4d\uff0c\u7136\u540e\u518d\u5c06\u98a0\u5012\u540e\u76842\u4e2a16\u4f4d\u6570\u4e92\u6362\u4f4d\u7f6e\u3002<\/span><\/p>\n

        <\/span><\/p>\n
        2. \u73b0\u5728\u95ee\u9898\u8f6c\u6362\u4e3a\u98a0\u5012\u4e00\u4e2a16\u4f4d\u4e8c\u8fdb\u5236\u6570\uff0c\u90a3\u4e48\u540c\u6837\u5c0616\u4f4d\u4e8c\u8fdb\u5236\u4f4d\u5206\u4e3a2\u4e2a8\u4f4d\u7684\u4e8c\u8fdb\u5236\u4f4d\uff0c\u5206\u522b\u98a0\u50122\u4e2a8\u4f4d\u7684\u4e8c\u8fdb\u5236\u4f4d\uff0c\u7136\u540e\u518d\u5c06\u98a0\u5012\u540e\u76842\u4e2a8\u4f4d\u6570\u4e92\u6362\u4f4d\u7f6e\u3002<\/span><\/p>\n

        <\/span><\/p>\n
        3. \u73b0\u5728\u95ee\u9898\u8f6c\u6362\u4e3a\u98a0\u5012\u4e00\u4e2a8\u4f4d\u4e8c\u8fdb\u5236\u6570\uff0c\u90a3\u4e48\u540c\u6837\u5c068\u4f4d\u4e8c\u8fdb\u5236\u4f4d\u5206\u4e3a2\u4e2a4\u4f4d\u7684\u4e8c\u8fdb\u5236\u4f4d\uff0c\u5206\u522b\u98a0\u50122\u4e2a4\u4f4d\u7684\u4e8c\u8fdb\u5236\u4f4d\uff0c\u7136\u540e\u518d\u5c06\u98a0\u5012\u540e\u76842\u4e2a4\u4f4d\u6570\u4e92\u6362\u4f4d\u7f6e\u3002<\/span><\/p>\n

        <\/span><\/p>\n
        4. \u73b0\u5728\u95ee\u9898\u8f6c\u6362\u4e3a\u98a0\u5012\u4e00\u4e2a4\u4f4d\u4e8c\u8fdb\u5236\u6570\uff0c\u90a3\u4e48\u540c\u6837\u5c064\u4f4d\u4e8c\u8fdb\u5236\u4f4d\u5206\u4e3a2\u4e2a2\u4f4d\u7684\u4e8c\u8fdb\u5236\u4f4d\uff0c\u5206\u522b\u98a0\u50122\u4e2a2\u4f4d\u7684\u4e8c\u8fdb\u5236\u4f4d\uff0c\u7136\u540e\u518d\u5c06\u98a0\u5012\u540e\u76842\u4e2a2\u4f4d\u6570\u4e92\u6362\u4f4d\u7f6e\u3002<\/span><\/p>\n

        <\/span><\/p>\n
        5. \u73b0\u5728\u95ee\u9898\u8f6c\u6362\u4e3a\u98a0\u5012\u4e00\u4e2a2\u4f4d\u4e8c\u8fdb\u5236\u6570\uff0c\u90a3\u4e48\u76f4\u63a5\u4ea4\u63622\u4e2a\u4e8c\u8fdb\u5236\u4f4d\u7684\u4f4d\u7f6e\u5373\u53ef\uff0c\u5373\u4ea4\u6362\u4e8c\u8fdb\u5236\u5947\u5076\u4f4d\u3002<\/span><\/p>\n

        <\/span><\/p>\n
        \u603b\u7ed3<\/span><\/strong>\uff1a\u8981\u6c42\u98a0\u501232\u4f4d -> \u9700\u8981\u5148\u6c42\u98a0\u501216\u4f4d -> \u9700\u8981\u5148\u6c42\u98a0\u50128\u4f4d -> \u9700\u8981\u5148\u6c42\u98a0\u50124\u4f4d -> \u9700\u8981\u5148\u6c42\u98a0\u50122\u4f4d\uff08\u4ea4\u6362\u4e8c\u8fdb\u5236\u5947\u5076\u4f4d\uff09,\u4e00\u4e2a\u9012\u5f52\u7684\u7b97\u6cd5\u3002<\/span><\/p>\n

        <\/span><\/p>\n
        \u4ee516\u4f4d <\/span>n = 0001 1100 1101 0100<\/span> \u4e3a\u4f8b\uff0c\u7ed3\u679c\u4e3a\uff1a<\/span>ans = 0010 1011 0011 1000<\/span>\u3002<\/span><\/p>\n

        <\/p>\n

        <\/p>\n
        \u4ee3\u7801\u5b9e\u73b0<\/span><\/section>\n
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          public<\/span> class<\/span> Solution<\/span> {<\/span><\/code>    \/\/ you need treat n as an unsigned value<\/span><\/span><\/code>    public<\/span> int<\/span> reverseBits<\/span>(int<\/span> n<\/span>)<\/span> {<\/span><\/code>        \/\/\u5947\u5076\u53cd\u8f6c<\/span><\/span><\/code>        n = (n & 0x55555555<\/span>) << 1<\/span> | (n >>> 1<\/span>) & 0x55555555<\/span>;<\/span><\/code>        \/\/\u4e24\u4e24\u53cd\u8f6c\uff0c \u6c42\u76844\u4f4d\u4e8c\u8fdb\u5236\u7684\u53cd\u8f6c<\/span><\/span><\/code>        n = (n & 0x33333333<\/span>) << 2<\/span> | (n >>> 2<\/span>) & 0x33333333<\/span>;<\/span><\/code>        \/\/ \u6bcf4\u4e2a\u8fdb\u884c\u53cd\u8f6c\uff0c\u6c42\u76848\u4f4d\u4e8c\u8fdb\u5236\u7684\u53cd\u8f6c<\/span><\/span><\/code>        n = (n & 0x0f0f0f0f<\/span>) << 4<\/span> | (n >>> 4<\/span>) & 0x0f0f0f0f<\/span>;<\/span><\/code>        \/\/ \u6bcf8\u4e2a\u8fdb\u884c\u53cd\u8f6c\uff0c\u6c42\u768416\u4f4d\u4e8c\u8fdb\u5236\u7684\u53cd\u8f6c<\/span><\/span><\/code>        n = (n & 0x00ff00ff<\/span>) << 8<\/span> | (n >>> 8<\/span>) & 0x00ff00ff<\/span>;<\/span><\/code>        \/\/ \u6bcf16\u4e2a\u8fdb\u884c\u53cd\u8f6c\uff0c\u6c42\u768432\u4f4d\u4e8c\u8fdb\u5236\u7684\u53cd\u8f6c<\/span><\/span><\/code>        n = (n & 0x0000ffff<\/span>) << 16<\/span> | (n >>> 16<\/span>) & 0x0000ffff<\/span>;<\/span><\/code>        return<\/span> n;<\/span><\/code>    }<\/span><\/code>}<\/span><\/code><\/pre>\n<\/section>\n
          \u590d\u6742\u5ea6\u5206\u6790<\/span><\/section>\n
          \u65f6\u95f4\u590d\u6742\u5ea6 O(1)\u3002<\/span><\/p>\n
          \u7a7a\u95f4\u590d\u6742\u5ea6 O(1)\u3002<\/span><\/p>\n
          <\/mp-style-type><\/p>\n
          \n
          \u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8e\u5fae\u4fe1\u516c\u4f17\u53f7:                 i\u4f59\u6570              <\/p>\n<\/blockquote>\n<\/div>\n","raw":"","protected":false},"excerpt":{"rendered":"
          \u9898\u76ee \u98a0\u5012\u7ed9\u5b9a\u7684 32 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\u7684\u4e8c\u8fdb\u5236\u4f4d\u3002 \u6765\u81ea\uff1ahttps:\/\/leetcode.cn\/problems\/reverse- …<\/p>\n","protected":false},"author":1,"featured_media":1529,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[22],"tags":[],"class_list":["post-1533","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-22"],"post_thumbnail_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043539126-150x150.jpeg","content_first_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043540328.png","post_medium_image_300":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043539126-300x127.jpeg","post_thumbnail_image_624":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043539126.jpeg","post_frist_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043540328.png","post_medium_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043539126-300x127.jpeg","post_large_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043539126.jpeg","post_full_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043539126.jpeg","post_all_images":[{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043540328.png","id":"image0"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043540328.png","id":"image1"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043542833.png","id":"image2"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043542833.png","id":"image3"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043544922.png","id":"image4"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230528043544922.png","id":"image5"}],"videoAdId":"","listAd":"0","listAdId":"","listAdEvery":6,"total_comments":0,"category_name":"\u7b97\u6cd5","post_date":"2023-06-27","like_count":"0","praiseWord":"\u9f13\u52b1","copyright_state":"","excitationAd":"0","rewardedVideoAdId":"","detailAdId":"","detailAd":"0","enterpriseMinapp":"0","audios":[],"postImageUrl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230519082947553.jpg","avatarurls":[],"related_posts":null,"pageviews":327,"next_post_id":2484,"next_post_title":"Java\u4e2d\u5c06 int[] \u6570\u7ec4 \u8f6c\u6362\u4e3a List\uff08ArrayList\uff09","previous_post_id":1489,"previous_post_title":"\u3010\u7b97\u6cd5\u9898\u89e3\u301114. \u6709\u6548\u7684\u62ec\u53f7","_links":{"self":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/1533","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1533"}],"version-history":[{"count":0,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/1533\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media\/1529"}],"wp:attachment":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}