1358. Number of Substrings Containing All Three Characters

Medium

30 Points

Hash Table

String

Sliding Window

Given a string s consisting only of characters a, b and c. Return the number of substrings containing at least one occurrence of all these characters a, b and c.

Examples

Example 1

Input: s = "abcabc" Output: 10 Explanation: The substrings containing at least one occurrence of the characters a, b and c are "abc", "abca", "abcab", "abcabc", "bca", "bcab", "bcabc", "cab", "cabc" and "abc" (again).

Example 2

Input: s = "aaacb" Output: 3 Explanation: The substrings containing at least one occurrence of the characters a, b and c are "aaacb", "aacb" and "acb".

Example 3

Input: s = "abc" Output: 1

Constraints

3 <= s.length <= 5 x 10^4
s only consists of a, b or c characters.