{"id":162,"date":"2017-11-02T17:59:06","date_gmt":"2017-11-02T09:59:06","guid":{"rendered":"http:\/\/kaispace.cn\/?p=162"},"modified":"2017-11-02T17:59:06","modified_gmt":"2017-11-02T09:59:06","slug":"%e5%85%b3%e4%ba%8enn-1%e9%9d%a2%e8%af%95%e9%a2%98%e7%9a%84%e7%90%86%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/blog.kaispace.cn\/?p=162","title":{"rendered":"\u5173\u4e8en&#038;(n-1)\u9762\u8bd5\u9898\u7684\u7406\u89e3"},"content":{"rendered":"<p>n&amp;(n-1)\u4f5c\u7528\uff1a\u5c06n\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u7684\u6700\u4f4e\u4f4d\u4e3a1\u7684\u6539\u4e3a0\uff0c\u5148\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<br \/>\n<span style=\"color: #ff0000;\">n = 10100(\u4e8c\u8fdb\u5236\uff09\uff0c\u5219(n-1) = 10011 ==\u300bn&amp;(n-1) = 10000<\/span><br \/>\n\u53ef\u4ee5\u770b\u5230\u539f\u672c\u6700\u4f4e\u4f4d\u4e3a1\u7684\u90a3\u4f4d\u53d8\u4e3a0\u3002<br \/>\n\u5f04\u660e\u767d\u4e86n&amp;(n-1)\u7684\u4f5c\u7528\uff0c\u90a3\u5b83\u6709\u54ea\u4e9b\u5e94\u7528\uff1f<br \/>\n1. \u6c42\u67d0\u4e00\u4e2a\u6570\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d1\u7684\u4e2a\u6570<br \/>\n<span style=\"color: #ff0000;\">while (n &gt;0 ) {<br \/>\ncount ++;<br \/>\nn &amp;= (n-1);<br \/>\n}<\/span><\/p>\n<blockquote><p>\u610f\u601d\u5c31\u662f\u6bcf\u6b21\u90fd\u628a\u6700\u540e\u4e00\u4f4d1\u53bb\u9664\uff0c\u76f4\u5230n=0\uff0c\u8df3\u51fa\u5faa\u73af<\/p><\/blockquote>\n<p>2. \u5224\u65ad\u4e00\u4e2a\u6570\u662f\u5426\u662f2\u7684\u65b9\u5e42<br \/>\n<span style=\"color: #ff0000;\">n &gt; 0 &amp;&amp; ((n &amp; (n &#8211; 1)) == 0 )<\/span><\/p>\n<blockquote><p>2\u7684\u65b9\u5e42\u5373\u662f\u53ea\u5b58\u5728\u4e00\u4e2a\u4e8c\u8fdb\u5236\u4f4d\u7f6e\u4e3a1<\/p>\n<p>\u59828 \u4e3a1000\uff0c16 \u4e3a1 0000<\/p><\/blockquote>\n<p>3. \u8ba1\u7b97N!\u7684\u8d28\u56e0\u65702\u7684\u4e2a\u6570\u3002<br \/>\n\u5bb9\u6613\u5f97\u51faN!\u8d28\u56e0\u65702\u7684\u4e2a\u6570 = [N \/ 2] + [N \/ 4] + [N \/ 8] + &#8230;.<br \/>\n\u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u6765\u63a8\u5bfc\u4e00\u4e0b\u8fc7\u7a0b\uff1aN = 10101(\u4e8c\u8fdb\u5236\u8868\u793a\uff09<br \/>\n\u73b0\u5728\u6211\u4eec\u8ddf\u8e2a\u6700\u9ad8\u4f4d\u76841\uff0c\u4e0d\u8003\u8651\u5176\u4ed6\u4f4d\u5047\u5b9a\u4e3a0\uff0c<br \/>\n\u5219\u5728<br \/>\n[N \/ 2]\u00a0\u00a0\u00a0 01000<br \/>\n[N \/ 4]\u00a0\u00a0\u00a0 00100<br \/>\n[N \/ 8]\u00a0\u00a0\u00a0 00010<br \/>\n[N \/ 8]\u00a0\u00a0\u00a0 00001<br \/>\n\u5219\u6240\u6709\u76f8\u52a0\u7b49\u4e8e01111 = 10000 &#8211; 1<br \/>\n\u7531\u6b64\u63a8\u53ca\u5176\u4ed6\u4f4d\u53ef\u5f97\uff1a(10101)!\u7684\u8d28\u56e0\u65702\u7684\u4e2a\u6570\u4e3a10000 &#8211; 1 + 00100 &#8211; 1 + 00001 &#8211; 1 = 10101 &#8211; 3(\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d1\u7684\u4e2a\u6570)<\/p>\n<p>\u63a8\u53ca\u4e00\u822cN!\u7684\u8d28\u56e0\u65702\u7684\u4e2a\u6570\u4e3aN &#8211; \uff08N\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d1\u7684\u4e2a\u6570\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>n&amp;(n-1)\u4f5c\u7528\uff1a\u5c06n\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u7684\u6700\u4f4e\u4f4d\u4e3a1\u7684\u6539\u4e3a0\uff0c\u5148\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a n = 10100(&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.kaispace.cn\/index.php?rest_route=\/wp\/v2\/posts\/162"}],"collection":[{"href":"https:\/\/blog.kaispace.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.kaispace.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.kaispace.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.kaispace.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=162"}],"version-history":[{"count":0,"href":"https:\/\/blog.kaispace.cn\/index.php?rest_route=\/wp\/v2\/posts\/162\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.kaispace.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.kaispace.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.kaispace.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}