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LeetCode 2262. Total Appeal of A String
原题链接在这里：https://leetcode.com/problems/total-appeal-of-a-string/ 题目： The appeal of a string is the number of distinct characters found in the string. For example, the appeal of "abbca" is 3 because it has 3 distinct characters: 'a', &#Count Subarray by Element
2262. Total Appeal of A String Hard The appeal of a string is the number of distinct characters found in the string. For example, the appeal of "abbca" is 3 because it has 3 distinct characters: 'a', 'b', and 'c