{ "data": { "question": { "questionId": "2340", "questionFrontendId": "2262", "categoryTitle": "Algorithms", "boundTopicId": 1457052, "title": "Total Appeal of A String", "titleSlug": "total-appeal-of-a-string", "content": "

The appeal of a string is the number of distinct characters found in the string.

\n\n\n\n

Given a string s, return the total appeal of all of its substrings.

\n\n

A substring is a contiguous sequence of characters within a string.

\n\n

 

\n

Example 1:

\n\n
\nInput: s = "abbca"\nOutput: 28\nExplanation: The following are the substrings of "abbca":\n- Substrings of length 1: "a", "b", "b", "c", "a" have an appeal of 1, 1, 1, 1, and 1 respectively. The sum is 5.\n- Substrings of length 2: "ab", "bb", "bc", "ca" have an appeal of 2, 1, 2, and 2 respectively. The sum is 7.\n- Substrings of length 3: "abb", "bbc", "bca" have an appeal of 2, 2, and 3 respectively. The sum is 7.\n- Substrings of length 4: "abbc", "bbca" have an appeal of 3 and 3 respectively. The sum is 6.\n- Substrings of length 5: "abbca" has an appeal of 3. The sum is 3.\nThe total sum is 5 + 7 + 7 + 6 + 3 = 28.\n
\n\n

Example 2:

\n\n
\nInput: s = "code"\nOutput: 20\nExplanation: The following are the substrings of "code":\n- Substrings of length 1: "c", "o", "d", "e" have an appeal of 1, 1, 1, and 1 respectively. The sum is 4.\n- Substrings of length 2: "co", "od", "de" have an appeal of 2, 2, and 2 respectively. The sum is 6.\n- Substrings of length 3: "cod", "ode" have an appeal of 3 and 3 respectively. The sum is 6.\n- Substrings of length 4: "code" has an appeal of 4. The sum is 4.\nThe total sum is 4 + 6 + 6 + 4 = 20.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "字符串的总引力", "translatedContent": "

字符串的 引力 定义为：字符串中 不同 字符的数量。

\n\n\n\n

给你一个字符串 s ，返回 其所有子字符串的总引力 。

\n\n

子字符串 定义为：字符串中的一个连续字符序列。

\n\n

 

\n\n

示例 1：

\n\n
输入：s = \"abbca\"\n输出：28\n解释：\"abbca\" 的子字符串有：\n- 长度为 1 的子字符串：\"a\"、\"b\"、\"b\"、\"c\"、\"a\" 的引力分别为 1、1、1、1、1，总和为 5 。\n- 长度为 2 的子字符串：\"ab\"、\"bb\"、\"bc\"、\"ca\" 的引力分别为 2、1、2、2 ，总和为 7 。\n- 长度为 3 的子字符串：\"abb\"、\"bbc\"、\"bca\" 的引力分别为 2、2、3 ，总和为 7 。\n- 长度为 4 的子字符串：\"abbc\"、\"bbca\" 的引力分别为 3、3 ，总和为 6 。\n- 长度为 5 的子字符串：\"abbca\" 的引力为 3 ，总和为 3 。\n引力总和为 5 + 7 + 7 + 6 + 3 = 28 。\n
\n\n

示例 2：

\n\n
输入：s = \"code\"\n输出：20\n解释：\"code\" 的子字符串有：\n- 长度为 1 的子字符串：\"c\"、\"o\"、\"d\"、\"e\" 的引力分别为 1、1、1、1 ，总和为 4 。\n- 长度为 2 的子字符串：\"co\"、\"od\"、\"de\" 的引力分别为 2、2、2 ，总和为 6 。\n- 长度为 3 的子字符串：\"cod\"、\"ode\" 的引力分别为 3、3 ，总和为 6 。\n- 长度为 4 的子字符串：\"code\" 的引力为 4 ，总和为 4 。\n引力总和为 4 + 6 + 6 + 4 = 20 。\n
\n\n

 

\n\n

提示：

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