{"id":1714,"date":"2021-07-12T14:20:40","date_gmt":"2021-07-12T06:20:40","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=1714"},"modified":"2021-07-12T14:55:49","modified_gmt":"2021-07-12T06:55:49","slug":"uoj-608-%e3%80%90ur-20%e3%80%91%e6%9c%ba%e5%99%a8%e8%9a%a4%e5%88%86%e7%bb%84","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/uoj-608-%e3%80%90ur-20%e3%80%91%e6%9c%ba%e5%99%a8%e8%9a%a4%e5%88%86%e7%bb%84\/","title":{"rendered":"UOJ #608. \u3010UR #20\u3011\u673a\u5668\u86a4\u5206\u7ec4"},"content":{"rendered":"

\u9898\u610f<\/h2>\n

https:\/\/uoj.ac\/problem\/608<\/a>
\n\u7ed9\u5b9a\u4e00\u4e2a\u5b57\u7b26\u4e32 T\uff0c\u6bcf\u6b21\u8be2\u95ee\u4e00\u4e2a\u5b50\u4e32 T[l,r]\uff0c\u8fd4\u56de\u5176\u6700\u957f\u91cd\u590d\u5b50\u4e32\u7684\u957f\u5ea6\u3002<\/p>\n

\u505a\u6cd5<\/h2>\n

\u8bc1\u660e\uff1f\u53c2\u8003 \u5b98\u65b9\u9898\u89e3<\/a>\u3002
\n\u6211\u4eec\u6765\u8ba8\u8bba\u600e\u4e48\u7528 SAM \u641e\u5b50\u4e32\u7684\u91cd\u590d\u5b50\u4e32\u3002<\/p>\n

\u9996\u5148\u56de\u5fc6\u600e\u4e48\u7528 SAM \u6c42\u6700\u957f\u91cd\u590d\u5b50\u4e32\u3002
\n\u76f4\u63a5\u8fd4\u56de fail \u6811\u4e0a\u975e\u53f6\u5b50\u8282\u70b9\u7684 len[u] \u5c31\u597d\u3002<\/p>\n

\u518d\u8003\u8651\u600e\u4e48\u6c42\u67d0\u4e2a\u524d\u7f00 T[1,r] \u7684\u6700\u957f\u91cd\u590d\u5b50\u4e32\u3002
\n\u6211\u4eec\u8003\u8651\u79bb\u7ebf\uff0c\u6309\u7167 r \u7aef\u70b9\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\uff0c
\n\u6309\u7167\u987a\u5e8f\u6bcf\u6b21\u5728 fail \u6811\u4e0a\u627e\u5230\u524d\u7f00\u6240\u5bf9\u5e94\u7684\u53f6\u5b50\u8282\u70b9\uff0c
\n\u5f80\u6839\u8282\u70b9\u67d3\u8272\u5373\u53ef\u3002\u7528\u67d3\u8272\u8def\u5f84\u4e0a\u7b2c\u4e00\u4e2a\u78b0\u5230\u7684\u8282\u70b9\u7684 len \u7684\u957f\u5ea6\u66f4\u65b0\u7b54\u6848\u3002
\n\u56e0\u4e3a\u6bcf\u4e2a\u8282\u70b9\u53ea\u4f1a\u88ab\u67d3\u8272\u4e00\u6b21\uff0c\u6240\u4ee5\u66b4\u529b\u67d3\u8272\u5373\u53ef\u3002<\/p>\n

\u6700\u540e\u8003\u8651\u4e00\u822c\u60c5\u51b5 T[l,r]\uff0c\u6211\u4eec\u663e\u7136\u9700\u8981\u5bf9\u67d3\u8272\u8fdb\u884c\u533a\u5206\uff0c
\n\u6211\u4eec\u5e0c\u671b\u6bcf\u4e2a\u72b6\u6001\u8d8a\u665a\u88ab\u67d3\u8272\u8d8a\u597d\uff0c\u56e0\u4e3a\u8d8a\u665a\uff0c\u5b83\u53ef\u80fd\u5bf9\u7b54\u6848\u7684\u8d21\u732e\u5c31\u8d8a\u957f\u3002
\n\u6211\u4eec\u4e0d\u59a8\u753b\u4e00\u4e0b\u793a\u610f\u56fe\u3002\u3002\u8003\u8651\u4e0b\u9762\u7684\u60c5\u51b5\u3002\u3002\u8003\u8651\u5230\u65f6\u523b r \u7684\u65f6\u5019\u7ecf\u8fc7\u8282\u70b9 u\u3002
\nu \u5386\u53f2\u4e0a\u5728\u65f6\u70b9 l1 \u548c l2 \u90fd\u88ab\u67d3\u8272\u8fc7\uff0c\u4e14 len[u] = 4\uff0c\u90a3\u4e48\u6709\uff1a
\n\u8bbe l1 < l2 < r\u3002
\n—l1, —l2, —r
\n\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u5ffd\u7565 l1\uff0c\u5e76\u4e14\u53ea\u6709\u5728 l <= l2-3 \u7684\u6642\u5019\uff0c\u624d\u80fd\u5f97\u5230
\n\u5b8c\u6574\u7684 4 \u957f\u5ea6\u7684\u8d21\u732e\uff0c\u5728 l2 \u65f6\u523b\uff0c\u56e0\u4e3a\u8be2\u95ee\u7684\u5de6\u533a\u95f4\u4e0d\u591f\u957f\uff0c\u53ea\u6709\u5bf9\u7b54\u6848\u5e26\u6765 1 \u7684\u8d21\u732e\u3002<\/p>\n

\u5177\u4f53\u8bf4\u6765\uff0c\u4e0d\u59a8\u5bf9\u6bcf\u4e2a\u53ef\u80fd\u4e09\u5143\u7ec4 (l,r,u)\u3002
\nr \u8868\u793a\u5f53\u524d\u67d3\u8272\u7684\u65f6\u70b9\uff0cl \u8868\u793a\u5386\u53f2\u4e0a\u8fd9\u4e2a\u8282\u70b9\u6700\u665a\u88ab\u67d3\u8272\u7684\u65f6\u70b9\u3002
\nu \u8868\u793a l, r \u5230\u6839\u8def\u5f84\u4e0a\u7684\u67d0\u4e2a\u516c\u5171\u7956\u5148\u3002<\/p>\n

\u6211\u4eec\u53ef\u4ee5\u7528\u7ebf\u6bb5\u6811\u3002\u3002\u3002
\n\u652f\u6301\u8be2\u95ee\u533a\u95f4\u6700\u503c\uff0c
\n\u4ee5\u53ca\u533a\u95f4\u8986\u76d6\uff0c\u548c\u533a\u95f4\u7b49\u5dee\u6570\u5217\u8986\u76d6\u4e24\u4e2a\u64cd\u4f5c\u5373\u53ef\u3002<\/p>\n

\u5177\u4f53\u8bf4\u6765\u5c31\u662f\u3002\u3002\u3002
\ncheckMax1(1, l-len[u], len[u])\uff0c\u8868\u793a\u5bf9\u533a\u95f4 [1, 1-len[u]] \u4e0e len[u] \u53d6 max\u3002
\n\u4ee5\u53ca
\ncheckMax2(l-len[u]+1, l)\uff0c\u8868\u793a\u5bf9 l-len[u]+1, l-len[u]+2\uff0c…, l \u8fd9\u4e2a\u533a\u95f4\u5206\u522b checkMax \u4e0a l, l-1, …, 1 \u8fd9\u4e2a\u9012\u51cf\u6570\u5217\u3002<\/p>\n

\u56e0\u4e3a\u67d3\u8272\u8fc7\u7a0b\u603b\u662f\u53f6\u5b50\u5230\u6839\u8282\u70b9\u7684\u8def\u5f84\uff0c\u6240\u4ee5\u53ef\u4ee5\u7528\u52a8\u6001\u6811\u3002
\n\u8fd9\u91cc\u7684\u52a8\u6001\u6811\u4e5f\u53ef\u4ee5\u7528\u542f\u53d1\u5f0f\u5408\u5e76\u66ff\u4ee3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u9898\u610f https:\/\/uoj.ac\/problem\/608 \u7ed9\u5b9a\u4e00\u4e2a\u5b57\u7b26\u4e32 T\uff0c\u6bcf\u6b21\u8be2\u95ee\u4e00\u4e2a\u5b50\u4e32 T[l,r]\uff0c\u8fd4\u56de\u5176\u6700\u957f\u91cd\u590d\u5b50\u4e32\u7684\u957f\u5ea6\u3002 \u505a\u6cd5 \u8bc1\u660e\uff1f\u53c2\u8003 \u5b98\u65b9\u9898\u89e3\u3002 \u6211\u4eec\u6765\u8ba8\u8bba\u600e\u4e48\u7528 SAM \u641e\u5b50\u4e32\u7684\u91cd\u590d\u5b50\u4e32\u3002 \u9996\u5148\u56de\u5fc6\u600e\u4e48\u7528 SAM \u6c42\u6700\u957f\u91cd\u590d\u5b50\u4e32\u3002 \u76f4\u63a5\u8fd4\u56de fail \u6811\u4e0a\u975e\u53f6\u5b50\u8282\u70b9\u7684 len[u] \u5c31\u597d\u3002 \u518d\u8003\u8651\u600e\u4e48\u6c42\u67d0\u4e2a\u524d\u7f00 T[1,r] \u7684\u6700\u957f\u91cd\u590d\u5b50\u4e32\u3002 \u6211\u4eec\u8003\u8651\u79bb\u7ebf\uff0c\u6309\u7167 r \u7aef\u70b9\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\uff0c \u6309\u7167\u987a\u5e8f\u6bcf\u6b21\u5728 fail \u6811\u4e0a\u627e\u5230\u524d\u7f00\u6240\u5bf9\u5e94\u7684\u53f6\u5b50\u8282\u70b9\uff0c \u5f80\u6839\u8282\u70b9\u67d3\u8272\u5373\u53ef\u3002\u7528\u67d3\u8272\u8def\u5f84\u4e0a\u7b2c\u4e00\u4e2a\u78b0\u5230\u7684\u8282\u70b9\u7684 len \u7684\u957f\u5ea6\u66f4\u65b0\u7b54\u6848\u3002 \u56e0\u4e3a\u6bcf\u4e2a\u8282\u70b9\u53ea\u4f1a\u88ab\u67d3\u8272\u4e00\u6b21\uff0c\u6240\u4ee5\u66b4\u529b\u67d3\u8272\u5373\u53ef\u3002 \u6700\u540e\u8003\u8651\u4e00\u822c\u60c5\u51b5 T[l,r]\uff0c\u6211\u4eec\u663e\u7136\u9700\u8981\u5bf9\u67d3\u8272\u8fdb\u884c\u533a\u5206\uff0c \u6211\u4eec\u5e0c\u671b\u6bcf\u4e2a\u72b6\u6001\u8d8a\u665a\u88ab\u67d3\u8272\u8d8a\u597d\uff0c\u56e0\u4e3a\u8d8a\u665a\uff0c\u5b83\u53ef\u80fd\u5bf9\u7b54\u6848\u7684\u8d21\u732e\u5c31\u8d8a\u957f\u3002 \u6211\u4eec\u4e0d\u59a8\u753b\u4e00\u4e0b\u793a\u610f\u56fe\u3002\u3002\u8003\u8651\u4e0b\u9762\u7684\u60c5\u51b5\u3002\u3002\u8003\u8651\u5230\u65f6\u523b r \u7684\u65f6\u5019\u7ecf\u8fc7\u8282\u70b9 u\u3002 u \u5386\u53f2\u4e0a\u5728\u65f6\u70b9 l1 \u548c l2 \u90fd\u88ab\u67d3\u8272\u8fc7\uff0c\u4e14 len[u] = 4\uff0c\u90a3\u4e48\u6709\uff1a \u8bbe l1 < l2 < r\u3002 —l1, […]<\/p>\n","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":[],"class_list":["post-1714","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-rE","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1714","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=1714"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1714\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=1714"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=1714"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=1714"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}