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424.html
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<!doctype html>
<html>
<head>
<meta charset='UTF-8'><meta name='viewport' content='width=device-width initial-scale=1'>
<title>424</title><link href='https://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,700,400&subset=latin,latin-ext' rel='stylesheet' type='text/css' /><style type='text/css'>html {overflow-x: initial !important;}#write, body { height: auto; }
#write, #write h1, #write h2, #write h3, #write h4, #write h5, #write h6, #write ol, #write p, #write ul { position: relative; }
#write, #write h1, #write h2, #write h3, #write h4, #write h5, #write h6, #write p, #write pre { width: inherit; }
#write, pre { white-space: pre-wrap; }
.CodeMirror, .md-fences, table { text-align: left; }
.md-reset, a:active, a:hover { outline: 0px; }
.md-reset, .md-toc-item a { text-decoration: none; }
.MathJax_SVG, .md-reset { float: none; direction: ltr; }
:root { --bg-color:#ffffff; --text-color:#333333; }
html { font-size: 14px; background-color: var(--bg-color); color: var(--text-color); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; -webkit-font-smoothing: antialiased; }
body { margin: 0px; padding: 0px; bottom: 0px; top: 0px; left: 0px; right: 0px; font-size: 1rem; line-height: 1.42857; overflow-x: hidden; background: inherit; }
a.url { word-break: break-all; }
.in-text-selection, ::selection { background: rgb(181, 214, 252); text-shadow: none; }
#write { margin: 0px auto; word-break: normal; word-wrap: break-word; padding-bottom: 70px; overflow-x: visible; }
.first-line-indent #write p .md-line { text-indent: 0px; }
.first-line-indent #write li, .first-line-indent #write p, .first-line-indent #write p .md-line:first-child { text-indent: 2em; }
.for-image #write { padding-left: 8px; padding-right: 8px; }
body.typora-export { padding-left: 30px; padding-right: 30px; }
@media screen and (max-width: 500px) {
body.typora-export { padding-left: 0px; padding-right: 0px; }
.CodeMirror-sizer { margin-left: 0px !important; }
.CodeMirror-gutters { display: none !important; }
}
#write > blockquote:first-child, #write > div:first-child, #write > ol:first-child, #write > p:first-child, #write > pre:first-child, #write > table:first-child, #write > ul:first-child { margin-top: 30px; }
#write li > table:first-child { margin-top: -20px; }
img { max-width: 100%; vertical-align: middle; }
button, input, select, textarea { color: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; }
input[type="checkbox"], input[type="radio"] { line-height: normal; padding: 0px; }
*, ::after, ::before { box-sizing: border-box; }
h1 { font-size: 2rem; }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.6rem; }
h4 { font-size: 1.4rem; }
h5 { font-size: 1.2rem; }
h6 { font-size: 1rem; }
p { -webkit-margin-before: 1rem; -webkit-margin-after: 1rem; -webkit-margin-start: 0px; -webkit-margin-end: 0px; }
.mathjax-block { margin-top: 0px; margin-bottom: 0px; -webkit-margin-before: 0px; -webkit-margin-after: 0px; }
.hidden { display: none; }
.md-blockmeta { color: rgb(204, 204, 204); font-weight: 700; font-style: italic; }
a { cursor: pointer; }
sup.md-footnote { padding: 2px 4px; background-color: rgba(238, 238, 238, 0.7); color: rgb(85, 85, 85); border-radius: 4px; }
#write input[type="checkbox"] { cursor: pointer; width: inherit; height: inherit; }
#write > figure:first-child { margin-top: 16px; }
figure { overflow-x: auto; margin: -8px 0px 0px -8px; max-width: calc(100% + 16px); padding: 8px; }
tr { break-inside: avoid; break-after: auto; }
thead { display: table-header-group; }
table { border-collapse: collapse; border-spacing: 0px; width: 100%; overflow: auto; break-inside: auto; }
.CodeMirror-line, .md-fences { break-inside: avoid; }
table.md-table td { min-width: 80px; }
.CodeMirror-gutters { border-right: 0px; background-color: inherit; margin-right: 4px; }
.CodeMirror-placeholder { opacity: 0.3; }
.CodeMirror pre { padding: 0px 4px; }
.CodeMirror-lines { padding: 0px; }
div.hr:focus { cursor: none; }
.md-fences { font-size: 0.9rem; display: block; overflow: visible; white-space: pre; background: inherit; position: relative !important; }
.md-diagram-panel { width: 100%; margin-top: 10px; text-align: center; padding-top: 0px; padding-bottom: 8px; overflow-x: auto; }
.md-fences .CodeMirror.CodeMirror-wrap { top: -1.6em; margin-bottom: -1.6em; }
.md-fences.mock-cm { white-space: pre-wrap; }
.show-fences-line-number .md-fences { padding-left: 0px; }
.show-fences-line-number .md-fences.mock-cm { padding-left: 40px; }
.footnotes { opacity: 0.8; font-size: 0.9rem; margin-top: 1em; margin-bottom: 1em; }
.footnotes + .footnotes { margin-top: 0px; }
.md-reset { margin: 0px; padding: 0px; border: 0px; vertical-align: top; background: 0px 0px; text-shadow: none; position: static; width: auto; height: auto; white-space: nowrap; cursor: inherit; -webkit-tap-highlight-color: transparent; line-height: normal; font-weight: 400; text-align: left; box-sizing: content-box; }
.md-toc-inner, a img, img a { cursor: pointer; }
li div { padding-top: 0px; }
blockquote { margin: 1rem 0px; }
li .mathjax-block, li p { margin: 0.5rem 0px; }
li { margin: 0px; position: relative; }
blockquote > :last-child { margin-bottom: 0px; }
blockquote > :first-child { margin-top: 0px; }
.footnotes-area { color: rgb(136, 136, 136); margin-top: 0.714rem; padding-bottom: 0.143rem; white-space: normal; }
@media print {
body, html { border: 1px solid transparent; height: 99%; break-after: avoid; break-before: avoid; }
#write { margin-top: 0px; border-color: transparent !important; }
.typora-export * { -webkit-print-color-adjust: exact; }
h1, h2, h3, h4, h5, h6 { break-after: avoid-page; orphans: 2; }
p { orphans: 4; }
html.blink-to-pdf { font-size: 13px; }
.typora-export #write { padding-left: 1cm; padding-right: 1cm; padding-bottom: 0px; break-after: avoid; }
.typora-export #write::after { height: 0px; }
@page { margin: 20mm 0px; }
}
.footnote-line { white-space: pre-wrap; margin-top: 0.714em; font-size: 0.7em; }
pre.md-meta-block { font-size: 0.8rem; min-height: 0.8rem; white-space: pre-wrap; background: rgb(204, 204, 204); display: block; overflow-x: hidden; }
p > img:only-child { display: block; margin: auto; }
.md-line > .md-image:only-child, p > .md-image:only-child { display: inline-block; width: 100%; text-align: center; }
.mathjax-block:not(:empty)::after, .md-toc-content::after, .md-toc::after { display: none; }
#write .MathJax_Display { margin: 0.8em 0px 0px; }
.mathjax-block { white-space: pre; overflow: hidden; width: 100%; }
p + .mathjax-block { margin-top: -1.143rem; }
[contenteditable="true"]:active, [contenteditable="true"]:focus { outline: 0px; box-shadow: none; }
.md-task-list-item { position: relative; list-style-type: none; }
.task-list-item.md-task-list-item { padding-left: 0px; }
.md-task-list-item > input { position: absolute; top: 0px; left: 0px; margin-left: -1.2em; margin-top: calc(1em - 10px); }
.math { font-size: 1rem; }
.md-toc { min-height: 3.58rem; position: relative; font-size: 0.9rem; border-radius: 10px; }
.MathJax_SVG, .mathjax-block .MathJax_SVG_Display { text-indent: 0px; max-width: none; max-height: none; min-height: 0px; }
.md-toc-content { position: relative; margin-left: 0px; }
.md-toc-item { display: block; color: rgb(65, 131, 196); }
.md-toc-inner:hover { }
.md-toc-inner { display: inline-block; }
.md-toc-h1 .md-toc-inner { margin-left: 0px; font-weight: 700; }
.md-toc-h2 .md-toc-inner { margin-left: 2em; }
.md-toc-h3 .md-toc-inner { margin-left: 4em; }
.md-toc-h4 .md-toc-inner { margin-left: 6em; }
.md-toc-h5 .md-toc-inner { margin-left: 8em; }
.md-toc-h6 .md-toc-inner { margin-left: 10em; }
@media screen and (max-width: 48em) {
.md-toc-h3 .md-toc-inner { margin-left: 3.5em; }
.md-toc-h4 .md-toc-inner { margin-left: 5em; }
.md-toc-h5 .md-toc-inner { margin-left: 6.5em; }
.md-toc-h6 .md-toc-inner { margin-left: 8em; }
}
a.md-toc-inner { font-size: inherit; font-style: inherit; font-weight: inherit; line-height: inherit; }
.footnote-line a:not(.reversefootnote) { color: inherit; }
.md-attr { display: none; }
.md-fn-count::after { content: "."; }
code, pre, tt { font-family: var(--monospace); }
.md-comment { color: rgb(162, 127, 3); opacity: 0.8; font-family: var(--monospace); }
code { text-align: left; }
a.md-print-anchor { border-width: initial !important; border-style: none !important; border-color: initial !important; display: inline-block !important; position: absolute !important; width: 1px !important; right: 0px !important; outline: 0px !important; background: 0px 0px !important; text-decoration: initial !important; text-shadow: initial !important; }
.md-inline-math .MathJax_SVG .noError { display: none !important; }
.mathjax-block .MathJax_SVG_Display { text-align: center; margin: 1em 0px; position: relative; min-width: 100%; width: auto; display: block !important; }
.MathJax_SVG_Display, .md-inline-math .MathJax_SVG_Display { width: auto; margin: inherit; display: inline-block !important; }
.MathJax_SVG .MJX-monospace { font-family: monospace; }
.MathJax_SVG .MJX-sans-serif { font-family: sans-serif; }
.MathJax_SVG { display: inline; font-style: normal; font-weight: 400; line-height: normal; zoom: 90%; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; min-width: 0px; border: 0px; padding: 0px; margin: 0px; }
.MathJax_SVG * { transition: none; }
.os-windows.monocolor-emoji .md-emoji { font-family: "Segoe UI Symbol", sans-serif; }
.md-diagram-panel > svg, [lang="flow"] svg, [lang="mermaid"] svg { max-width: 100%; }
[lang="mermaid"] .node text { font-size: 1rem; }
table tr th { border-bottom: 0px; }
.CodeMirror, .CodeMirror-sizer { position: relative; }
.CodeMirror.cm-s-inner { background: inherit; }
.fences-no-line-wrapping .md-fences .CodeMirror { margin-top: -30px; }
.CodeMirror-scroll { overflow-y: hidden; overflow-x: auto; }
.CodeMirror-lines { padding: 4px 0px; }
.CodeMirror-gutter-filler, .CodeMirror-scrollbar-filler { background-color: rgb(255, 255, 255); }
.CodeMirror-scroll, .cm-s-inner .CodeMirror-activeline-background { background: inherit; }
.CodeMirror-linenumber { padding: 0px 3px 0px 5px; text-align: right; color: rgb(153, 153, 153); }
.cm-s-inner .cm-keyword { color: rgb(119, 0, 136); }
.cm-s-inner .cm-atom, .cm-s-inner.cm-atom { color: rgb(34, 17, 153); }
.cm-s-inner .cm-number { color: rgb(17, 102, 68); }
.cm-s-inner .cm-def { color: rgb(0, 0, 255); }
.cm-s-inner .cm-variable { color: rgb(0, 0, 0); }
.cm-s-inner .cm-variable-2 { color: rgb(0, 85, 170); }
.cm-s-inner .cm-variable-3 { color: rgb(0, 136, 85); }
.cm-s-inner .cm-string { color: rgb(170, 17, 17); }
.cm-s-inner .cm-property { color: rgb(0, 0, 0); }
.cm-s-inner .cm-operator { color: rgb(152, 26, 26); }
.cm-s-inner .cm-comment, .cm-s-inner.cm-comment { color: rgb(170, 85, 0); }
.cm-s-inner .cm-string-2 { color: rgb(255, 85, 0); }
.cm-s-inner .cm-meta, .cm-s-inner .cm-qualifier { color: rgb(85, 85, 85); }
.cm-s-inner .cm-builtin { color: rgb(51, 0, 170); }
.cm-s-inner .cm-bracket { color: rgb(153, 153, 119); }
.cm-s-inner .cm-tag { color: rgb(17, 119, 0); }
.cm-s-inner .cm-attribute { color: rgb(0, 0, 204); }
.cm-s-inner .cm-header, .cm-s-inner.cm-header { color: rgb(0, 0, 255); }
.cm-s-inner .cm-quote, .cm-s-inner.cm-quote { color: rgb(0, 153, 0); }
.cm-s-inner .cm-hr, .cm-s-inner.cm-hr { color: rgb(153, 153, 153); }
.cm-s-inner .cm-link, .cm-s-inner.cm-link { color: rgb(0, 0, 204); }
.cm-negative { color: rgb(221, 68, 68); }
.cm-positive { color: rgb(34, 153, 34); }
.cm-header, .cm-strong { font-weight: 700; }
.cm-del { text-decoration: line-through; }
.cm-em { font-style: italic; }
.cm-link { text-decoration: underline; }
.cm-error, .cm-invalidchar { color: red; }
.cm-constant { color: rgb(38, 139, 210); }
.cm-defined { color: rgb(181, 137, 0); }
div.CodeMirror span.CodeMirror-matchingbracket { color: rgb(0, 255, 0); }
div.CodeMirror span.CodeMirror-nonmatchingbracket { color: rgb(255, 34, 34); }
.CodeMirror { height: auto; overflow: hidden; }
.CodeMirror-scroll { margin-bottom: -30px; padding-bottom: 30px; height: 100%; outline: 0px; position: relative; box-sizing: content-box; }
.CodeMirror-gutter-filler, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler, .CodeMirror-vscrollbar { position: absolute; z-index: 6; display: none; }
.CodeMirror-vscrollbar { right: 0px; top: 0px; overflow-x: hidden; overflow-y: scroll; }
.CodeMirror-hscrollbar { bottom: 0px; left: 0px; overflow-y: hidden; overflow-x: scroll; }
.CodeMirror-scrollbar-filler { right: 0px; bottom: 0px; }
.CodeMirror-gutter-filler { left: 0px; bottom: 0px; }
.CodeMirror-gutters { border-right: 1px solid rgb(221, 221, 221); background: inherit; white-space: nowrap; position: absolute; left: 0px; top: 0px; padding-bottom: 30px; z-index: 3; }
.CodeMirror-gutter { white-space: normal; height: 100%; box-sizing: content-box; padding-bottom: 30px; margin-bottom: -32px; display: inline-block; }
.CodeMirror-gutter-wrapper { position: absolute; z-index: 4; background: 0px 0px !important; border: none !important; }
.CodeMirror-gutter-background { position: absolute; top: 0px; bottom: 0px; z-index: 4; }
.CodeMirror-gutter-elt { position: absolute; cursor: default; z-index: 4; }
.CodeMirror-lines { cursor: text; }
.CodeMirror pre { border-radius: 0px; border-width: 0px; background: 0px 0px; font-family: inherit; font-size: inherit; margin: 0px; white-space: pre; word-wrap: normal; color: inherit; z-index: 2; position: relative; overflow: visible; }
.CodeMirror-wrap pre { word-wrap: break-word; white-space: pre-wrap; word-break: normal; }
.CodeMirror-code pre { border-right: 30px solid transparent; width: fit-content; }
.CodeMirror-wrap .CodeMirror-code pre { border-right: none; width: auto; }
.CodeMirror-linebackground { position: absolute; left: 0px; right: 0px; top: 0px; bottom: 0px; z-index: 0; }
.CodeMirror-linewidget { position: relative; z-index: 2; overflow: auto; }
.CodeMirror-wrap .CodeMirror-scroll { overflow-x: hidden; }
.CodeMirror-measure { position: absolute; width: 100%; height: 0px; overflow: hidden; visibility: hidden; }
.CodeMirror-measure pre { position: static; }
.CodeMirror div.CodeMirror-cursor { position: absolute; border-right: none; width: 0px; visibility: hidden; }
.CodeMirror-focused div.CodeMirror-cursor { visibility: inherit; }
.CodeMirror-selected { background: rgb(217, 217, 217); }
.CodeMirror-focused .CodeMirror-selected { background: rgb(215, 212, 240); }
.cm-searching { background: rgba(255, 255, 0, 0.4); }
@media print {
.CodeMirror div.CodeMirror-cursor { visibility: hidden; }
}
.CodeMirror-lint-markers { width: 16px; }
.CodeMirror-lint-tooltip { background-color: infobackground; border: 1px solid rgb(0, 0, 0); border-radius: 4px; color: infotext; font-family: var(--monospace); overflow: hidden; padding: 2px 5px; position: fixed; white-space: pre-wrap; z-index: 10000; max-width: 600px; opacity: 0; transition: opacity 0.4s; font-size: 0.8em; }
.CodeMirror-lint-mark-error, .CodeMirror-lint-mark-warning { background-position: left bottom; background-repeat: repeat-x; }
.CodeMirror-lint-mark-error { background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAYAAAC09K7GAAAAAXNSR0IArs4c6QAAAAZiS0dEAP8A/wD/oL2nkwAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9sJDw4cOCW1/KIAAAAZdEVYdENvbW1lbnQAQ3JlYXRlZCB3aXRoIEdJTVBXgQ4XAAAAHElEQVQI12NggIL/DAz/GdA5/xkY/qPKMDAwAADLZwf5rvm+LQAAAABJRU5ErkJggg=="); }
.CodeMirror-lint-marker-error, .CodeMirror-lint-marker-warning { background-position: center center; background-repeat: no-repeat; cursor: pointer; display: inline-block; height: 16px; width: 16px; vertical-align: middle; position: relative; }
.CodeMirror-lint-message-error, .CodeMirror-lint-message-warning { padding-left: 18px; background-position: left top; background-repeat: no-repeat; }
.CodeMirror-lint-marker-error, .CodeMirror-lint-message-error { background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAAHlBMVEW7AAC7AACxAAC7AAC7AAAAAAC4AAC5AAD///+7AAAUdclpAAAABnRSTlMXnORSiwCK0ZKSAAAATUlEQVR42mWPOQ7AQAgDuQLx/z8csYRmPRIFIwRGnosRrpamvkKi0FTIiMASR3hhKW+hAN6/tIWhu9PDWiTGNEkTtIOucA5Oyr9ckPgAWm0GPBog6v4AAAAASUVORK5CYII="); }
.CodeMirror-lint-marker-warning, .CodeMirror-lint-message-warning { background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAANlBMVEX/uwDvrwD/uwD/uwD/uwD/uwD/uwD/uwD/uwD6twD/uwAAAADurwD2tQD7uAD+ugAAAAD/uwDhmeTRAAAADHRSTlMJ8mN1EYcbmiixgACm7WbuAAAAVklEQVR42n3PUQqAIBBFUU1LLc3u/jdbOJoW1P08DA9Gba8+YWJ6gNJoNYIBzAA2chBth5kLmG9YUoG0NHAUwFXwO9LuBQL1giCQb8gC9Oro2vp5rncCIY8L8uEx5ZkAAAAASUVORK5CYII="); }
.CodeMirror-lint-marker-multiple { background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAcAAAAHCAMAAADzjKfhAAAACVBMVEUAAAAAAAC/v7914kyHAAAAAXRSTlMAQObYZgAAACNJREFUeNo1ioEJAAAIwmz/H90iFFSGJgFMe3gaLZ0od+9/AQZ0ADosbYraAAAAAElFTkSuQmCC"); background-repeat: no-repeat; background-position: right bottom; width: 100%; height: 100%; }
:root { --side-bar-bg-color: #fafafa; --control-text-color: #777; }
@font-face { font-family: "Open Sans"; font-style: normal; font-weight: normal; src: local("Open Sans Regular"), url("./github/400.woff") format("woff"); }
@font-face { font-family: "Open Sans"; font-style: italic; font-weight: normal; src: local("Open Sans Italic"), url("./github/400i.woff") format("woff"); }
@font-face { font-family: "Open Sans"; font-style: normal; font-weight: bold; src: local("Open Sans Bold"), url("./github/700.woff") format("woff"); }
@font-face { font-family: "Open Sans"; font-style: italic; font-weight: bold; src: local("Open Sans Bold Italic"), url("./github/700i.woff") format("woff"); }
html { font-size: 16px; }
body { font-family: "Open Sans", "Clear Sans", "Helvetica Neue", Helvetica, Arial, sans-serif; color: rgb(51, 51, 51); line-height: 1.6; }
#write { max-width: 860px; margin: 0px auto; padding: 20px 30px 100px; }
#write > ul:first-child, #write > ol:first-child { margin-top: 30px; }
body > :first-child { margin-top: 0px !important; }
body > :last-child { margin-bottom: 0px !important; }
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<div id='write' class = 'is-node'><h2><a name='header-n0' class='md-header-anchor '></a>424. Longest Repeating Character Replacement</h2><p><strong>题目：</strong></p><p><img src='http://p9zl5r4hu.bkt.clouddn.com/2018-10-01_28leet_424.png' alt='' referrerPolicy='no-referrer' /></p><p><strong>解答：</strong></p><p>这个确实很难理解，我也是看了LeetCode别人的解释，自己写了个帮助函数打印出每一次更改的变化，才理解了这个遍历过程的细节，以及为什么能够在O(n)的遍历下完成所以的查找工作。</p><p>方法是在一个窗口内，查找出其中出现最多次数的字符，然后比较这个窗口内的其他字符的个数cnt_other与k值的大小，如果k值大于cnt_other，说明能够通过k次字符替代，此窗口内字符串变成一个相同字符的字符串。</p><p>重点是分析为何这样的一次遍历，能够将所有可能的窗口值都筛选出来，保证最长相同字符串的可能性都存在与遍历方法中。<del>以及理解为何maxCnt不需要在内部while循环修改了charlist后重置</del>(原因是maxCnt统计的不是窗口内的最多字符的个数，而是[0,end]之间的，所以不存在减值)。</p><p><strong>代码：</strong></p><pre class="md-fences md-end-block" lang="cpp" style="break-inside: unset;"> <div class="CodeMirror cm-s-inner CodeMirror-wrap"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 4px; left: 4px;"></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 0px; margin-bottom: 0px; border-right-width: 30px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: 0px; width: 0px;"></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-keyword">class</span> <span class="cm-def">Solution</span> {</span></pre></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-keyword">public</span>:</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-comment">// start,end为窗口的起始位置和终止位置，charlist为在窗口内的字符的个数统计数组</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-comment">// maxCnt是统计了[0,end]之间的出现次数最多的字符个数</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-comment">// maxLen是符合要求的最长字符串的长度</span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-variable-3">int</span> <span class="cm-variable">characterReplacement</span>(<span class="cm-variable">string</span> <span class="cm-variable">s</span>, <span class="cm-variable-3">int</span> <span class="cm-variable">k</span>) {</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-variable-3">int</span> <span class="cm-variable">charlist</span>[<span class="cm-number">26</span>];</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-keyword">for</span>(<span class="cm-variable-3">int</span> <span class="cm-variable">i</span> <span class="cm-operator">=</span> <span class="cm-number">0</span>;<span class="cm-variable">i</span> <span class="cm-operator"><</span> <span class="cm-number">26</span>; <span class="cm-operator">++</span><span class="cm-variable">i</span>)</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-variable">charlist</span>[<span class="cm-variable">i</span>] <span class="cm-operator">=</span> <span class="cm-number">0</span>;</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-variable-3">int</span> <span class="cm-variable">start</span> <span class="cm-operator">=</span> <span class="cm-number">0</span>, <span class="cm-variable">end</span> <span class="cm-operator">=</span> <span class="cm-number">0</span>;</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-variable-3">int</span> <span class="cm-variable">maxCnt</span> <span class="cm-operator">=</span> <span class="cm-number">0</span>, <span class="cm-variable">maxLen</span> <span class="cm-operator">=</span> <span class="cm-number">0</span>, <span class="cm-variable">len</span> <span class="cm-operator">=</span> <span class="cm-variable">s</span>.<span class="cm-variable">size</span>();</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span cm-text=""></span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-keyword">while</span>(<span class="cm-variable">end</span> <span class="cm-operator"><</span> <span class="cm-variable">len</span>){</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-variable">maxCnt</span> <span class="cm-operator">=</span> <span class="cm-variable">max</span>(<span class="cm-variable">maxCnt</span>, <span class="cm-operator">++</span><span class="cm-variable">charlist</span>[<span class="cm-variable">s</span>[<span class="cm-variable">end</span>]<span class="cm-operator">-</span><span class="cm-string">'A'</span>]);</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-keyword">while</span>(<span class="cm-variable">end</span> <span class="cm-operator">-</span> <span class="cm-variable">start</span> <span class="cm-operator">+</span> <span class="cm-number">1</span> <span class="cm-operator">-</span> <span class="cm-variable">maxCnt</span> <span class="cm-operator">></span> <span class="cm-variable">k</span>){</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-operator">--</span><span class="cm-variable">charlist</span>[<span class="cm-variable">s</span>[<span class="cm-variable">start</span>]<span class="cm-operator">-</span><span class="cm-string">'A'</span>];</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-operator">++</span><span class="cm-variable">start</span>;</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> }</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span cm-text=""></span></span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-variable">maxLen</span> <span class="cm-operator">=</span> <span class="cm-variable">max</span>(<span class="cm-variable">maxLen</span>, <span class="cm-variable">end</span> <span class="cm-operator">-</span> <span class="cm-variable">start</span> <span class="cm-operator">+</span> <span class="cm-number">1</span>);</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-operator">++</span><span class="cm-variable">end</span>;</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> }</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-keyword">return</span> <span class="cm-variable">maxLen</span>;</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> }</span></pre><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;">};</span></pre></div></div></div></div></div><div style="position: absolute; height: 30px; width: 1px; border-bottom: 0px solid transparent; top: 568px;"></div><div class="CodeMirror-gutters" style="display: none; height: 598px;"></div></div></div></pre><p> </p></div>
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