{"id":942,"date":"2019-10-08T14:58:05","date_gmt":"2019-10-08T06:58:05","guid":{"rendered":"http:\/\/SmokeyDays.top\/wordpress\/?p=942"},"modified":"2019-10-08T15:18:28","modified_gmt":"2019-10-08T07:18:28","slug":"942","status":"publish","type":"post","link":"http:\/\/SmokeyDays.top\/wordpress\/2019\/10\/08\/942\/","title":{"rendered":"lp2219 HAOI2007 \u4fee\u7b51\u7eff\u5316\u5e26"},"content":{"rendered":"\n

\u6211\u4eec\u77e5\u9053\uff0c\u5982\u679c\u6211\u4eec\u786e\u5b9a\u4e86\u6bcf\u4e2a\u5927\u77e9\u5f62\u5305\u542b\u7684\u6743\u503c\u6700\u5c0f\u7684\u5c0f\u77e9\u5f62\uff0c\u90a3\u4e48\u6211\u4eec\u53ea\u9700\u8981\u679a\u4e3e\u4e00\u904d\u6bcf\u4e00\u4e2a\u5927\u77e9\u5f62\u5e76\u6bd4\u8f83\u5b83\u4eec\u7684\u56de\u5f62\u90e8\u5206\u7684\u6700\u5927\u503c\u3002<\/p>\n\n\n\n

\u90a3\u4e48\u6211\u4eec\u8003\u8651\u7528\u5355\u8c03\u961f\u5217\u6765\u9884\u5904\u7406\u51fa\u6bcf\u4e00\u4e2a\u5c0f\u77e9\u5f62\u7684\u6743\u503c\uff0c\u7136\u540e\u7528\u4e8c\u7ef4\u7ebf\u6bb5\u6811\u6765\u7ef4\u62a4\u8fd9\u4e2a\u6743\u503c\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u5728\\(n^2log^2n\\)\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u5185\u5b8c\u6210\u8fd9\u9053\u9898\u3002
\n\u4f46\u4ed4\u7ec6\u89c2\u5bdf\u6211\u4eec\u611f\u89c9\\(n^2log^2n\\)\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u5bf9\u4e8e\\(1000\\)\u7684\u6570\u636e\u8303\u56f4\u5b58\u5728\u4e00\u5b9a\u7684\u56f0\u96be\u3002\u6211\u4eec\u8003\u8651\u662f\u5426\u5b58\u5728\u4e00\u79cd\\(n^2\\)\u590d\u6742\u5ea6\u7684\u505a\u6cd5\u3002
\n\u6709\u8fd9\u6837\u4e00\u9053\u9898\u53eb\u505a\u7406\u60f3\u7684\u6b63\u65b9\u5f62\u3002\u8fd9\u4e00\u9898\u8981\u6c42\u7684\u662f\u5e73\u9762\u4e0a\u77e9\u5f62\u5185\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c\u4e4b\u5dee\u3002\u663e\u7136\uff0c\u6211\u4eec\u53ef\u4ee5\u7ef4\u62a42n\u4e2a\u5355\u8c03\u961f\u5217\u6765\u8ba1\u7b97\u8fd9\u4e2a\u6700\u5927\u503c\u3002
\n\u90a3\u4e48\uff0c\u5bf9\u4e8e\u8fd9\u9898\u7684\u5f3a\u5316\u677f\uff0c\u6211\u4eec\u8be5\u600e\u4e48\u505a\u5462\uff1f
\n\u5982\u679c\u786e\u5b9a\u4e86\u53f3\u4e0b\u89d2\uff0c\u90a3\u4e48\u6574\u4e2a\u77e9\u5f62\u7684\u6743\u503c\u662f\u5df2\u7ecf\u56fa\u5b9a\u4e86\u7684\u3002\u90a3\u4e48\uff0c\u6211\u4eec\u8981\u6c42\u7684\u5c31\u662f\u90a3\u4e2a\u77e9\u5f62\u91cc\u9762\u6743\u503c\u6700\u5c0f\u7684\u5b50\u77e9\u5f62\u3002\u8fd9\u4e00\u65b9\u9762\u662f\u548c\u7406\u60f3\u7684\u6b63\u65b9\u5f62\u76f8\u540c\u7684\u3002
\n\u6211\u4eec\u4e0d\u59a8\u8bbe\\(c_{i,j}\\)\u8868\u793a\u4ee5(i,j)\u4e3a\u53f3\u4e0b\u89d2\u7684\u7eff\u5316\u5e26\u80fd\u5305\u62ec\u7684\u82b1\u575b\u7684\u6700\u5c0f\u503c\u3002\u95ee\u9898\u5c31\u8f6c\u53d8\u4e3a\u600e\u4e48\u6c42\u51fa\\(c_{i,j}\\)\u3002
\n\u4ed4\u7ec6\u8003\u8651\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53d1\u73b0\uff0c\u6bcf\u4e2a\u82b1\u575b\u7684\u6700\u5c0f\u503c\u662f\u53ef\u4ee5\u9884\u5904\u7406\u7684\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u5c31\u628a\u8fd9\u4e00\u9898\u8f6c\u5316\u4e3a\u4e86\u7406\u60f3\u7684\u6b63\u65b9\u5f62\u3002
\n\u540c\u6837\u7528\u4e8c\u7ef4\u5355\u8c03\u961f\u5217\u7ef4\u62a4\u5373\u53ef\u3002
\n\u9700\u8981\u6ce8\u610f\u8fb9\u754c\u6761\u4ef6\u8f83\u4e3a\u590d\u6742\uff0c\u4e14\u4e0d\u8981\u6df7\u6dc6\u5355\u8c03\u961f\u5217\u91cc\u7684\u6570\u7684\u610f\u4e49\u3002 <\/p>\n\n\n\n

#include<iostream>\n#include<cstdio>\n#include<cstring>\n#include<algorithm>\n#include<queue>\n#include<vector>\nusing namespace std;\n\nconst int N=1005;\n\nint n,m,A,B,C,D;\nint val[N][N],sm[N][N],a[N][N],b[N][N];\ndeque<int> q[N],qq;\nvoid init(){\n\tscanf(\"%d%d%d%d%d%d\",&n,&m,&B,&A,&D,&C);\n\tfor(int i=1;i<=n;++i){\n\t\tfor(int j=1;j<=m;++j){\n\t\t\tscanf(\"%d\",&val[i][j]);\n\t\t}\n\t}\n\tfor(int i=1;i<=n;++i){\n\t\tfor(int j=1;j<=m;++j){\n\t\t\tsm[i][j]=val[i][j]+sm[i][j-1]+sm[i-1][j]-sm[i-1][j-1];\n\t\t}\n\t}\n\tfor(int i=B;i<=n;++i){\n\t\tfor(int j=A;j<=m;++j){\n\t\t\tb[i][j]=sm[i][j]-sm[i-B][j]-sm[i][j-A]+sm[i-B][j-A];\n\/\/\t\t\tprintf(\"%d \",b[i][j]);\n\t\t}\n\/\/\t\tputs(\"\");\n\t}\n\tfor(int i=D;i<=n;++i){\n\t\tfor(int j=C;j<=m;++j){\n\t\t\ta[i][j]=sm[i][j]-sm[i-D][j]-sm[i][j-C]+sm[i-D][j-C];\n\/\/\t\t\tprintf(\"%d \",a[i][j]);\n\t\t}\n\/\/\t\tputs(\"\");\n\t}\n\tint ans=0;\n\tfor(int i=D+1;i<n;++i){\n\t\tfor(int j=C+1;j<m;++j){\n\/\/\t\t\tprintf(\"%d %d\\n\",i,j);\n\t\t\twhile(!q[j].empty()&&a[q[j].back()][j]>a[i][j]){q[j].pop_back();}\n\t\t\tq[j].push_back(i);\n\t\t\twhile(!q[j].empty()&&i-q[j].front()>B-D-2){q[j].pop_front();}\n\t\t}\n\t\twhile(!qq.empty()){qq.pop_back();}\n\t\tfor(int j=C+1;j<m;++j){\n\t\t\twhile(!qq.empty()&&a[q[qq.back()].front()][qq.back()]>a[q[j].front()][j]){qq.pop_back();}\n\t\t\tqq.push_back(j);\n\t\t\twhile(!qq.empty()&&j-qq.front()>A-C-2){qq.pop_front();}\n\t\t\tif(!qq.empty()&&i>=B-1&&j>=A-1){ans=max(ans,b[i+1][j+1]-a[q[qq.front()].front()][qq.front()]);}\n\t\t}\n\t}\n\tprintf(\"%d\\n\",ans);\n}\nint main(){\n\tinit();\n\treturn 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u6211\u4eec\u77e5\u9053\uff0c\u5982\u679c\u6211\u4eec\u786e\u5b9a\u4e86\u6bcf\u4e2a\u5927\u77e9\u5f62\u5305\u542b\u7684\u6743\u503c\u6700\u5c0f\u7684\u5c0f\u77e9\u5f62\uff0c\u90a3\u4e48\u6211\u4eec\u53ea\u9700\u8981\u679a\u4e3e\u4e00\u904d\u6bcf\u4e00\u4e2a\u5927\u77e9\u5f62\u5e76\u6bd4\u8f83\u5b83\u4eec\u7684\u56de\u5f62\u90e8 … <\/p>\n
\u7ee7\u7eed\u9605\u8bfb\u201clp2219 HAOI2007 \u4fee\u7b51\u7eff\u5316\u5e26\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[118,120,43,9,6,119,5],"tags":[],"_links":{"self":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/942"}],"collection":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/comments?post=942"}],"version-history":[{"count":2,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/942\/revisions"}],"predecessor-version":[{"id":945,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/942\/revisions\/945"}],"wp:attachment":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/media?parent=942"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/categories?post=942"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/tags?post=942"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}