leetcode-problemset/leetcode-cn/originData/replace-the-substring-for-balanced-string.json

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        "question": {
            "questionId": "1351",
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            "categoryTitle": "Algorithms",
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            "title": "Replace the Substring for Balanced String",
            "titleSlug": "replace-the-substring-for-balanced-string",
            "content": "<p>You are given a string s of length <code>n</code> containing only four kinds of characters: <code>&#39;Q&#39;</code>, <code>&#39;W&#39;</code>, <code>&#39;E&#39;</code>, and <code>&#39;R&#39;</code>.</p>\n\n<p>A string is said to be <strong>balanced</strong><em> </em>if each of its characters appears <code>n / 4</code> times where <code>n</code> is the length of the string.</p>\n\n<p>Return <em>the minimum length of the substring that can be replaced with <strong>any</strong> other string of the same length to make </em><code>s</code><em> <strong>balanced</strong></em>. If s is already <strong>balanced</strong>, return <code>0</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;QWER&quot;\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> s is already balanced.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;QQWE&quot;\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> We need to replace a &#39;Q&#39; to &#39;R&#39;, so that &quot;RQWE&quot; (or &quot;QRWE&quot;) is balanced.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;QQQW&quot;\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> We can replace the first &quot;QQ&quot; to &quot;ER&quot;. \n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == s.length</code></li>\n\t<li><code>4 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>n</code> is a multiple of <code>4</code>.</li>\n\t<li><code>s</code> contains only <code>&#39;Q&#39;</code>, <code>&#39;W&#39;</code>, <code>&#39;E&#39;</code>, and <code>&#39;R&#39;</code>.</li>\n</ul>\n",
            "translatedTitle": "替换子串得到平衡字符串",
            "translatedContent": "<p>有一个只含有&nbsp;<code>'Q', 'W', 'E',&nbsp;'R'</code>&nbsp;四种字符，且长度为 <code>n</code>&nbsp;的字符串。</p>\n\n<p>假如在该字符串中，这四个字符都恰好出现&nbsp;<code>n/4</code>&nbsp;次，那么它就是一个「平衡字符串」。</p>\n\n<p>&nbsp;</p>\n\n<p>给你一个这样的字符串 <code>s</code>，请通过「替换一个子串」的方式，使原字符串 <code>s</code> 变成一个「平衡字符串」。</p>\n\n<p>你可以用和「待替换子串」长度相同的&nbsp;<strong>任何</strong> 其他字符串来完成替换。</p>\n\n<p>请返回待替换子串的最小可能长度。</p>\n\n<p>如果原字符串自身就是一个平衡字符串，则返回 <code>0</code>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"QWER\"\n<strong>输出：</strong>0\n<strong>解释：</strong>s 已经是平衡的了。</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"QQWE\"\n<strong>输出：</strong>1\n<strong>解释：</strong>我们需要把一个 'Q' 替换成 'R'，这样得到的 \"RQWE\" (或 \"QRWE\") 是平衡的。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"QQQW\"\n<strong>输出：</strong>2\n<strong>解释：</strong>我们可以把前面的 \"QQ\" 替换成 \"ER\"。 \n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<pre>\n<strong>输入：</strong>s = \"QQQQ\"\n<strong>输出：</strong>3\n<strong>解释：</strong>我们可以替换后 3 个 'Q'，使 s = \"QWER\"。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10^5</code></li>\n\t<li><code>s.length</code>&nbsp;是&nbsp;<code>4</code>&nbsp;的倍数</li>\n\t<li><code>s</code>&nbsp;中只含有&nbsp;<code>'Q'</code>, <code>'W'</code>, <code>'E'</code>,&nbsp;<code>'R'</code>&nbsp;四种字符</li>\n</ul>\n",
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                "Use 2-pointers algorithm to make sure all amount of characters outside the 2 pointers are smaller or equal to n/4.",
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