{"id":189,"date":"2019-08-12T15:59:00","date_gmt":"2019-08-12T15:59:00","guid":{"rendered":"https:\/\/imwarming.com\/?p=189"},"modified":"2019-08-12T15:59:00","modified_gmt":"2019-08-12T15:59:00","slug":"codeforcesround%23442%28div-2%29b-nikitaandstring","status":"publish","type":"post","link":"https:\/\/imwarming.com\/?p=189","title":{"rendered":"Codeforces Round #442 (Div. 2) B. Nikita and string"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img2018.cnblogs.com\/blog\/1634852\/201908\/1634852-20190812234741725-1121862076.png\" alt=\"\" \/><\/p>\n<p>\u9898\u610f\uff1a\u6c42\u6700\u957f\u53ef\u4ee5\u5206a b a\u4e3a\u4e09\u90e8\u5206\u5b50\u4e32\uff0ca b a\u53ef\u4ee5\u4e3a\u7a7a<\/p>\n<p>&nbsp;\u601d\u8def\u5728\u4ee3\u7801\u91cc<\/p>\n<div class=\"cnblogs_code\">\n<pre><span style=\"color: #008080;\"> 1<\/span> #include&lt;cstdio&gt;\n<span style=\"color: #008080;\"> 2<\/span> #include&lt;iostream&gt;\n<span style=\"color: #008080;\"> 3<\/span> #include&lt;cstring&gt;\n<span style=\"color: #008080;\"> 4<\/span> #include&lt;cmath&gt;\n<span style=\"color: #008080;\"> 5<\/span> #include&lt;algorithm&gt;\n<span style=\"color: #008080;\"> 6<\/span> <span style=\"color: #0000ff;\">#define<\/span> maxn 505\n<span style=\"color: #008080;\"> 7<\/span> <span style=\"color: #0000ff;\">using<\/span> <span style=\"color: #0000ff;\">namespace<\/span><span style=\"color: #000000;\"> std;\n<\/span><span style=\"color: #008080;\"> 8<\/span> <span style=\"color: #0000ff;\">int<\/span><span style=\"color: #000000;\"> main(){\n<\/span><span style=\"color: #008080;\"> 9<\/span>     <span style=\"color: #0000ff;\">char<\/span> a[<span style=\"color: #800080;\">5001<\/span><span style=\"color: #000000;\">];\n<\/span><span style=\"color: #008080;\">10<\/span>     <span style=\"color: #0000ff;\">int<\/span> b[<span style=\"color: #800080;\">5001<\/span>],c[<span style=\"color: #800080;\">5001<\/span><span style=\"color: #000000;\">];\n<\/span><span style=\"color: #008080;\">11<\/span>     cin&gt;&gt;a+<span style=\"color: #800080;\">1<\/span><span style=\"color: #000000;\">;\n<\/span><span style=\"color: #008080;\">12<\/span>     <span style=\"color: #0000ff;\">int<\/span> t=strlen(a+<span style=\"color: #800080;\">1<\/span><span style=\"color: #000000;\">);\n<\/span><span style=\"color: #008080;\">13<\/span>     <span style=\"color: #0000ff;\">for<\/span>(<span style=\"color: #0000ff;\">int<\/span> i=<span style=\"color: #800080;\">1<\/span>;i&lt;=t;i++<span style=\"color: #000000;\">){\n<\/span><span style=\"color: #008080;\">14<\/span>         b[i]=b[i-<span style=\"color: #800080;\">1<\/span>]+(a[i]==<span style=\"color: #800000;\">'<\/span><span style=\"color: #800000;\">a<\/span><span style=\"color: #800000;\">'<\/span>);<span style=\"color: #008000;\">\/\/<\/span><span style=\"color: #008000;\">\u524di\u4e2aa\u7684\u4e2a\u6570<\/span>\n<span style=\"color: #008080;\">15<\/span>         c[i]=c[i-<span style=\"color: #800080;\">1<\/span>]+(a[i]==<span style=\"color: #800000;\">'<\/span><span style=\"color: #800000;\">b<\/span><span style=\"color: #800000;\">'<\/span>);<span style=\"color: #008000;\">\/\/<\/span><span style=\"color: #008000;\">\u524di\u4e2ab\u7684\u4e2a\u6570<\/span>\n<span style=\"color: #008080;\">16<\/span> <span style=\"color: #000000;\">    }\n<\/span><span style=\"color: #008080;\">17<\/span>     <span style=\"color: #0000ff;\">int<\/span> ans=<span style=\"color: #800080;\">0<\/span><span style=\"color: #000000;\">;\n<\/span><span style=\"color: #008080;\">18<\/span>     <span style=\"color: #0000ff;\">for<\/span>(<span style=\"color: #0000ff;\">int<\/span> i=<span style=\"color: #800080;\">0<\/span>;i&lt;=t;i++){<span style=\"color: #008000;\">\/\/<\/span><span style=\"color: #008000;\">\u4e3a\u4ec0\u4e48\u4e0d\u4ece1\u5f00\u59cb\uff0c\u56e0\u4e3aaba\u6709\u7a7a\u4e32\u60c5\u51b5<\/span>\n<span style=\"color: #008080;\">19<\/span>         <span style=\"color: #0000ff;\">for<\/span>(<span style=\"color: #0000ff;\">int<\/span> j=i;j&lt;=t;j++<span style=\"color: #000000;\">){\n<\/span><span style=\"color: #008080;\">20<\/span>             ans=max(ans,b[i]+c[j]-c[i]+b[t]-b[j]);<span style=\"color: #008000;\">\/\/<\/span><span style=\"color: #008000;\">(\u524di\u4e2aa\u7684\u4e2a\u6570)+(i\u5230j\u7684b\u7684\u4e2a\u6570)+(j\u5230t\u7684a\u7684\u4e2a\u6570)<\/span>\n<span style=\"color: #008080;\">21<\/span> <span style=\"color: #000000;\">        }\n<\/span><span style=\"color: #008080;\">22<\/span> <span style=\"color: #000000;\">    }\n<\/span><span style=\"color: #008080;\">23<\/span>     cout&lt;&lt;<span style=\"color: #000000;\">ans;\n<\/span><span style=\"color: #008080;\">24<\/span>     <span style=\"color: #0000ff;\">return<\/span> <span style=\"color: #800080;\">0<\/span><span style=\"color: #000000;\">;\n<\/span><span style=\"color: #008080;\">25<\/span> }<\/pre>\n<\/div>\n<p>&nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/img2018.cnblogs.com\/blog\/1634852\/201908\/1634852-20190813103940371-1939228500.jpg\" alt=\"\" width=\"163\" height=\"151\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u610f\uff1a\u6c42\u6700\u957f\u53ef\u4ee5\u5206a b a\u4e3a\u4e09\u90e8\u5206\u5b50\u4e32\uff0ca b a\u53ef\u4ee5\u4e3a\u7a7a &nbsp;\u601d\u8def\u5728\u4ee3\u7801\u91cc 1 #inc [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-189","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Codeforces Round #442 (Div. 2) B. 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