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leetcode-problemset/leetcode-cn/originData/split-a-string-into-the-max-number-of-unique-substrings.json
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{
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"question": {
"questionId": "1715",
"questionFrontendId": "1593",
"categoryTitle": "Algorithms",
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"title": "Split a String Into the Max Number of Unique Substrings",
"titleSlug": "split-a-string-into-the-max-number-of-unique-substrings",
"content": "<p>Given a string&nbsp;<code>s</code><var>,</var>&nbsp;return <em>the maximum&nbsp;number of unique substrings that the given string can be split into</em>.</p>\n\n<p>You can split string&nbsp;<code>s</code> into any list of&nbsp;<strong>non-empty substrings</strong>, where the concatenation of the substrings forms the original string.&nbsp;However, you must split the substrings such that all of them are <strong>unique</strong>.</p>\n\n<p>A <strong>substring</strong> is a contiguous sequence of characters within a string.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;ababccc&quot;\n<strong>Output:</strong> 5\n<strong>Explanation</strong>: One way to split maximally is [&#39;a&#39;, &#39;b&#39;, &#39;ab&#39;, &#39;c&#39;, &#39;cc&#39;]. Splitting like [&#39;a&#39;, &#39;b&#39;, &#39;a&#39;, &#39;b&#39;, &#39;c&#39;, &#39;cc&#39;] is not valid as you have &#39;a&#39; and &#39;b&#39; multiple times.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aba&quot;\n<strong>Output:</strong> 2\n<strong>Explanation</strong>: One way to split maximally is [&#39;a&#39;, &#39;ba&#39;].\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aa&quot;\n<strong>Output:</strong> 1\n<strong>Explanation</strong>: It is impossible to split the string any further.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>\n\t<p><code>1 &lt;= s.length&nbsp;&lt;= 16</code></p>\n\t</li>\n\t<li>\n\t<p><code>s</code> contains&nbsp;only lower case English letters.</p>\n\t</li>\n</ul>\n",
"translatedTitle": "拆分字符串使唯一子字符串的数目最大",
"translatedContent": "<p>给你一个字符串 <code>s</code> ,请你拆分该字符串,并返回拆分后唯一子字符串的最大数目。</p>\n\n<p>字符串 <code>s</code> 拆分后可以得到若干 <strong>非空子字符串</strong> ,这些子字符串连接后应当能够还原为原字符串。但是拆分出来的每个子字符串都必须是 <strong>唯一的</strong> 。</p>\n\n<p>注意:<strong>子字符串</strong> 是字符串中的一个连续字符序列。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n\n<pre><strong>输入:</strong>s = &quot;ababccc&quot;\n<strong>输出:</strong>5\n<strong>解释:</strong>一种最大拆分方法为 [&#39;a&#39;, &#39;b&#39;, &#39;ab&#39;, &#39;c&#39;, &#39;cc&#39;] 。像 [&#39;a&#39;, &#39;b&#39;, &#39;a&#39;, &#39;b&#39;, &#39;c&#39;, &#39;cc&#39;] 这样拆分不满足题目要求,因为其中的 &#39;a&#39; 和 &#39;b&#39; 都出现了不止一次。\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre><strong>输入:</strong>s = &quot;aba&quot;\n<strong>输出:</strong>2\n<strong>解释:</strong>一种最大拆分方法为 [&#39;a&#39;, &#39;ba&#39;] 。\n</pre>\n\n<p><strong>示例 3</strong></p>\n\n<pre><strong>输入:</strong>s = &quot;aa&quot;\n<strong>输出:</strong>1\n<strong>解释:</strong>无法进一步拆分字符串。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li>\n\t<p><code>1 &lt;= s.length&nbsp;&lt;= 16</code></p>\n\t</li>\n\t<li>\n\t<p><code>s</code> 仅包含小写英文字母</p>\n\t</li>\n</ul>\n",
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"hints": [
"Use a set to keep track of which substrings have been used already",
"Try each possible substring at every position and backtrack if a complete split is not possible"
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