{"id":995,"date":"2014-10-02T07:55:57","date_gmt":"2014-10-01T23:55:57","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=995"},"modified":"2014-10-02T07:57:21","modified_gmt":"2014-10-01T23:57:21","slug":"hdu-3480-division","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/hdu-3480-division\/","title":{"rendered":"HDU 3480. Division"},"content":{"rendered":"<p><!--more--><\/p>\n<h3>Brief description: <\/h3>\n<p>\u7565\u3002\uff09<\/p>\n<h3>Analysis: <\/h3>\n<p>\u8001\u5957\u8def\u3002\u3002\u867d\u7136\u9898\u76ee\u4fdd\u8bc1 32-int\u3002\u3002\u3002\u4f46\u662f\u5b9e\u9645\u8fd8\u662f\u6709\u4e00\u4e9b\u5371\u9669\u7684\uff08\uff1f\uff09\u3002<br \/>\n\u3002\u5168\u7a0b LL \u5c45\u7136\u4f1a TLE\u3002=_=\uff09<\/p>\n<pre class=\"brush: cpp; light: false; title: ; toolbar: true; notranslate\" title=\"\">\r\n\/\/}\/* .................................................................................................................................. *\/\r\n\r\nconst int N = int(1e4) + 9;\r\nint _f&#x5B;2]&#x5B;N], *f = _f&#x5B;0], *ff = _f&#x5B;1]; int A&#x5B;N]; int q&#x5B;N], cz, op;\r\nint n, m;\r\n\r\n#define k (-2*A&#x5B;i])\r\n#define x(j) (A&#x5B;j+1])\r\n#define y(j) (ff&#x5B;j] + sqr(x(j)))\r\n#define eval(j) (k*x(j) + y(j))\r\n\r\nLL det(LL x1, LL y1, LL x2, LL y2){\r\n    return x1*y2 - x2*y1;\r\n}\r\nint dett(int p0, int p1, int p2){\r\n    LL t = det(x(p1)-x(p0), y(p1)-y(p0), x(p2)-x(p0), y(p2)-y(p0));\r\n    return t &lt; 0 ? -1 : t &gt; 0;\r\n}\r\n\r\nint main(){\r\n\r\n#ifndef ONLINE_JUDGE\r\n    freopen(&quot;in.txt&quot;, &quot;r&quot;, stdin);\r\n    \/\/freopen(&quot;out.txt&quot;, &quot;w&quot;, stdout);\r\n#endif\r\n\r\n    Rush{\r\n\r\n        RD(n, m); REP_1(i, n) RD(A&#x5B;i]); sort(A+1, A+n+1);\r\n\r\n        REP_1(i, n) f&#x5B;i] = sqr(A&#x5B;i] - A&#x5B;1]);\r\n\r\n        DO(m-1){\r\n            swap(f, ff); cz = 0, op = -1; REP_1(i, n){\r\n                while (cz &lt; op &amp;&amp; dett(q&#x5B;op-1], q&#x5B;op], i) &lt;= 0) --op; q&#x5B;++op] = i;\r\n                while (cz &lt; op &amp;&amp; eval(q&#x5B;cz]) &gt;= eval(q&#x5B;cz+1])) ++cz; f&#x5B;i] = sqr(A&#x5B;i]) + eval(q&#x5B;cz]);\r\n            }\r\n        }\r\n\r\n        OT(f&#x5B;n]);\r\n    }\r\n}\r\n\r\n<\/pre>\n<p><a href=\"http:\/\/acm.hust.edu.cn\/vjudge\/problem\/viewSource.action?id=2801201\">http:\/\/acm.hust.edu.cn\/vjudge\/problem\/viewSource.action?id=2801201<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[1],"tags":[136],"class_list":["post-995","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag--dp"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-g3","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/995","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/comments?post=995"}],"version-history":[{"count":1,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/995\/revisions"}],"predecessor-version":[{"id":996,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/995\/revisions\/996"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=995"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=995"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}