{"id":54,"date":"2023-03-05T22:15:14","date_gmt":"2023-03-05T14:15:14","guid":{"rendered":"https:\/\/bh4bqi.cn\/?p=54"},"modified":"2023-06-02T22:34:26","modified_gmt":"2023-06-02T14:34:26","slug":"%e5%90%88%e6%88%90%e6%b8%b8%e6%88%8f","status":"publish","type":"post","link":"https:\/\/bh4bqi.cn\/?p=54","title":{"rendered":"\u5408\u6210\u6e38\u620f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/iai.sh.cn\/problem\/45\">https:\/\/iai.sh.cn\/problem\/45<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u9898\u76ee\u63cf\u8ff0<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u6709\u5f88\u591a\u5408\u6210\u7c7b\u7684\u6e38\u620f\u90fd\u6709\u5982\u4e0b\u7684\u73a9\u6cd5\uff1a\u73a9\u5bb6\u4f1a\u5f97\u5230\u5f88\u591a\u6570\u5b57\uff0c\u6bcf\u4e2a\u6570\u5b57\u90fd\u662f&nbsp;22&nbsp;\u7684\u5e42\uff0c\u73a9\u5bb6\u53ef\u4ee5\u6311\u9009\u4e24\u4e2a\u4e00\u6837\u5927\u7684\u6570\u5b57\uff0c\u5c06\u5b83\u4eec\u5408\u6210\u4e00\u4e2a\u65b0\u7684\u6570\u5b57\uff0c\u65b0\u6570\u5b57\u4e3a\u539f\u6570\u5b57\u7684\u4e24\u500d\u5927\u5c0f\u3002\u5982\u679c\u8fd9\u79cd\u5408\u6210\u64cd\u4f5c\u53ef\u4ee5\u4e0d\u65ad\u5730\u8fdb\u884c\uff0c\u7ed9\u5b9a\u5c0f\u7231\u5728\u6700\u521d\u83b7\u5f97\u7684\u6570\u5b57\u96c6\u5408\uff0c\u8bf7\u5e2e\u5979\u7b97\u4e00\u4e0b\u80fd\u591f\u83b7\u5f97\u7684\u6700\u5927\u6570\u5b57\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\u00a0\u7684\u5e42\u662f\u6307\u53ea\u6709\u00a02\u4f5c\u4e3a\u7d20\u56e0\u5b50\u7684\u6b63\u6574\u6570\u3002\u5982\u00a04\u3001256\u00a0\u7b49\u7b49\u3002\u4f46\u00a060\u00a0\u4e0d\u662f\uff0c\u56e0\u4e3a\u5b83\u6709\u7d20\u56e0\u5b50\u00a03\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u8f93\u5165\u683c\u5f0f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c\u4e00\u884c\uff1a\u5355\u4e2a\u6b63\u6574\u6570&nbsp;n<em>n<\/em>\uff0c\u8868\u793a\u5c0f\u7231\u4e00\u5f00\u59cb\u62e5\u6709\u7684\u6570\u5b57\u6570\u91cf\uff1b<br>\u7b2c\u4e8c\u884c\uff1an<em>n<\/em>&nbsp;\u4e2a\u6b63\u6574\u6570&nbsp;a1,a2,\u22ef\u2009,an<em>a<\/em>1\u200b,<em>a<\/em>2\u200b,\u22ef,<em>a<\/em><em>n<\/em>\u200b\uff0c\u8868\u793a\u521a\u5f00\u59cb\u65f6\u83b7\u5f97\u7684\u6570\u5b57\uff0c\u4fdd\u8bc1\u6bcf\u4e2a\u6570\u5b57\u90fd\u662f&nbsp;22&nbsp;\u7684\u5e42\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u8f93\u51fa\u683c\u5f0f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5355\u4e2a\u6b63\u6574\u6570\uff1a\u8868\u793a\u6700\u540e\u53ef\u4ee5\u5f97\u5230\u7684\u6700\u5927\u6570\u5b57\u5927\u5c0f\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u6570\u636e\u8303\u56f4<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u4e8e&nbsp;30%30%&nbsp;\u7684\u6570\u636e\uff0c1\u2264n\u22641001\u2264<em>n<\/em>\u2264100\uff0c1\u2264ai\u22641281\u2264<em>a<\/em><em>i<\/em>\u200b\u2264128\uff1b<\/li>\n\n\n\n<li>\u5bf9\u4e8e&nbsp;60%60%&nbsp;\u7684\u6570\u636e\uff0c1\u2264n\u226420001\u2264<em>n<\/em>\u22642000\uff0c1\u2264ai\u22642201\u2264<em>a<\/em><em>i<\/em>\u200b\u2264220\uff1b<\/li>\n\n\n\n<li>\u5bf9\u4e8e&nbsp;100%100%&nbsp;\u7684\u6570\u636e\uff0c1\u2264n\u22641,000,0001\u2264<em>n<\/em>\u22641,000,000\uff0c1\u2264ai\u22642401\u2264<em>a<\/em><em>i<\/em>\u200b\u2264240\uff1b<\/li>\n<\/ul>\n\n\n\n<p class=\"has-cyan-bluish-gray-background-color has-background has-x-large-font-size wp-block-paragraph\"><strong>\u6362\u5e95\u80cc\u666f\u77e5\u8bc6<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/baike.baidu.com\/item\/%E5%AF%B9%E6%95%B0%E6%8D%A2%E5%BA%95%E5%85%AC%E5%BC%8F\/18881661\" target=\"_blank\" rel=\"noreferrer noopener\">\u6362\u5e95\u516c\u5f0f\u662f\u4e00\u4e2a\u6570\u5b66\u516c\u5f0f\uff0c\u5b83\u53ef\u4ee5\u8ba9\u4f60\u628a\u4e00\u4e2a\u5bf9\u6570\u7684\u5e95\u6570\u6362\u6210\u53e6\u4e00\u4e2a\u5bf9\u6570\u7684\u5e95\u6570\u3002<\/a><a href=\"https:\/\/baike.baidu.com\/item\/%E5%AF%B9%E6%95%B0%E6%8D%A2%E5%BA%95%E5%85%AC%E5%BC%8F\/18881661\" target=\"_blank\" rel=\"noreferrer noopener\"><sup>1<\/sup><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/357159782\" target=\"_blank\" rel=\"noreferrer noopener\">\u6362\u5e95\u516c\u5f0f\u7684\u82f1\u6587\u662f change of base formula\u3002<\/a><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/357159782\" target=\"_blank\" rel=\"noreferrer noopener\"><sup>2<\/sup><\/a><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/366589111\" target=\"_blank\" rel=\"noreferrer noopener\"><sup>3<\/sup><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/baike.baidu.com\/item\/%E5%AF%B9%E6%95%B0%E6%8D%A2%E5%BA%95%E5%85%AC%E5%BC%8F\/18881661\" target=\"_blank\" rel=\"noreferrer noopener\">\u6362\u5e95\u516c\u5f0f\u7684\u5f62\u5f0f\u662f log_b(x) = log_a(x) \/ log_a(b)\uff0c\u5176\u4e2d a \u548c b \u90fd\u662f\u5927\u4e8e\u96f6\u800c\u4e0d\u7b49\u4e8e\u4e00\u7684\u5e38\u6570\uff0cx \u662f\u4e00\u4e2a\u6b63\u6570\u3002<\/a><a href=\"https:\/\/baike.baidu.com\/item\/%E5%AF%B9%E6%95%B0%E6%8D%A2%E5%BA%95%E5%85%AC%E5%BC%8F\/18881661\" target=\"_blank\" rel=\"noreferrer noopener\"><sup>1<\/sup><\/a><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/357159782\" target=\"_blank\" rel=\"noreferrer noopener\"><sup>2<\/sup><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/357159782\" target=\"_blank\" rel=\"noreferrer noopener\">\u8fd9\u4e2a\u516c\u5f0f\u7684\u610f\u601d\u662f\uff0c\u5982\u679c\u4f60\u60f3\u8ba1\u7b97\u4ee5 b \u4e3a\u5e95\u7684 x \u7684\u5bf9\u6570\uff0c\u4f60\u53ef\u4ee5\u7528\u4ee5 a \u4e3a\u5e95\u7684 x \u7684\u5bf9\u6570\u9664\u4ee5\u4ee5 a \u4e3a\u5e95\u7684 b \u7684\u5bf9\u6570\u6765\u5f97\u5230\u3002<\/a><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/357159782\" target=\"_blank\" rel=\"noreferrer noopener\"><sup>2<\/sup><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u60f3\u8ba1\u7b97\u4ee5 2 \u4e3a\u5e95\u7684 8 \u7684\u5bf9\u6570\uff0c\u4f60\u53ef\u4ee5\u7528\u6362\u5e95\u516c\u5f0f\u628a\u5b83\u53d8\u6210\u4ee5 10 \u4e3a\u5e95\u7684\u5bf9\u6570\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">log_2(8) = log_10(8) \/ log_10(2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7136\u540e\u4f60\u5c31\u53ef\u4ee5\u7528\u8ba1\u7b97\u5668\u6216\u8005\u67e5\u8868\u6765\u6c42\u51fa\u8fd9\u4e24\u4e2a\u5bf9\u6570\u7684\u503c\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">log_10(8) \u2248 0.9031<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">log_10(2) \u2248 0.3010<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff0c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">log_2(8) = log_10(8) \/ log_10(2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2248 0.9031 \/ 0.3010<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2248 3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u7ed3\u679c\u548c\u76f4\u63a5\u7528\u6307\u6570\u5b9a\u4e49\u6c42\u51fa\u6765\u7684\u4e00\u6837\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">log_2(8) = y<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u21d4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2^y = 8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u21d4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">y = 3<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;c++ \u4ee3\u7801\u5b9e\u73b0&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\n#include &lt;algorithm&gt;\n#include &lt;cmath&gt;\n\nusing namespace std;\n\nint main(){\n    int n;\n    long long sum = 0;\n    int k;\n    long long ans;\n    \n    cin &gt;&gt; n;\n    \n    long long a&#91;n];\n\n    for (int i = 0; i &lt; n; i ++)\n        cin &gt;&gt; a&#91;i];\n    \n    sort(a, a + n);\n    \n    for (int i = 0; i &lt; n; i ++)\n        sum += a&#91;i];\n\n    \n    k = log(sum)\/log(2);\n    ans = (long long)pow(2,k);\n    cout &lt;&lt; ans &lt;&lt; endl;\n    \n    return 0;\n\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/iai.sh.cn\/problem\/45 \u9898\u76ee\u63cf\u8ff0 \u6709\u5f88\u591a\u5408\u6210\u7c7b\u7684\u6e38\u620f\u90fd\u6709\u5982\u4e0b\u7684\u73a9\u6cd5\uff1a\u73a9\u5bb6\u4f1a\u5f97 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-54","post","type-post","status-publish","format-standard","hentry","category-code"],"_links":{"self":[{"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=\/wp\/v2\/posts\/54","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=54"}],"version-history":[{"count":6,"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=\/wp\/v2\/posts\/54\/revisions"}],"predecessor-version":[{"id":63,"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=\/wp\/v2\/posts\/54\/revisions\/63"}],"wp:attachment":[{"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=54"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=54"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bh4bqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=54"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}