{ "data": { "question": { "questionId": "1632", "questionFrontendId": "1525", "categoryTitle": "Algorithms", "boundTopicId": 344076, "title": "Number of Good Ways to Split a String", "titleSlug": "number-of-good-ways-to-split-a-string", "content": "

You are given a string s.

\n\n

A split is called good if you can split s into two non-empty strings sleft and sright where their concatenation is equal to s (i.e., sleft + sright = s) and the number of distinct letters in sleft and sright is the same.

\n\n

Return the number of good splits you can make in s.

\n\n

 

\n

Example 1:

\n\n
\nInput: s = "aacaba"\nOutput: 2\nExplanation: There are 5 ways to split "aacaba" and 2 of them are good. \n("a", "acaba") Left string and right string contains 1 and 3 different letters respectively.\n("aa", "caba") Left string and right string contains 1 and 3 different letters respectively.\n("aac", "aba") Left string and right string contains 2 and 2 different letters respectively (good split).\n("aaca", "ba") Left string and right string contains 2 and 2 different letters respectively (good split).\n("aacab", "a") Left string and right string contains 3 and 1 different letters respectively.\n
\n\n

Example 2:

\n\n
\nInput: s = "abcd"\nOutput: 1\nExplanation: Split the string as follows ("ab", "cd").\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "字符串的好分割数目", "translatedContent": "

给你一个字符串 s ，一个分割被称为 「好分割」 当它满足：将 s 分割成 2 个字符串 p 和 q ，它们连接起来等于 s 且 p 和 q 中不同字符的数目相同。

\n\n

请你返回 s 中好分割的数目。

\n\n

 

\n\n

示例 1：

\n\n
输入：s = "aacaba"\n输出：2\n解释：总共有 5 种分割字符串 "aacaba" 的方法，其中 2 种是好分割。\n("a", "acaba") 左边字符串和右边字符串分别包含 1 个和 3 个不同的字符。\n("aa", "caba") 左边字符串和右边字符串分别包含 1 个和 3 个不同的字符。\n("aac", "aba") 左边字符串和右边字符串分别包含 2 个和 2 个不同的字符。这是一个好分割。\n("aaca", "ba") 左边字符串和右边字符串分别包含 2 个和 2 个不同的字符。这是一个好分割。\n("aacab", "a") 左边字符串和右边字符串分别包含 3 个和 1 个不同的字符。\n
\n\n

示例 2：

\n\n
输入：s = "abcd"\n输出：1\n解释：好分割为将字符串分割成 ("ab", "cd") 。\n
\n\n

示例 3：

\n\n
输入：s = "aaaaa"\n输出：4\n解释：所有分割都是好分割。
\n\n

示例 4：

\n\n
输入：s = "acbadbaada"\n输出：2\n
\n\n

 

\n\n

提示：

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