Count Substrings With K-Frequency Characters I - Video Solutions

MediumHash TableStringSliding Window

LeetCode was HARD until I Learned these 15 Patterns

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Count Substrings With K-Frequency Characters I - Video Solution

Watch 10 video solutions for Count Substrings With K-Frequency Characters I, a medium level problem involving Hash Table, String, Sliding Window. This walkthrough by Ashish Pratap Singh has 1,002,307 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.

Problem Statement

Given a string s and an integer k, return the total number of substrings of s where at least one character appears at least k times.

Example 1:

Input: s = "abacb", k = 2

Output: 4

Explanation:

The valid substrings are:

"aba" (character 'a' appears 2 times).
"abac" (character 'a' appears 2 times).
"abacb" (character 'a' appears 2 times).
"bacb" (character 'b' appears 2 times).

Example 2:

Input: s = "abcde", k = 1

Output: 15

Explanation:

All substrings are valid because every character appears at least once.

Constraints:

1 <= s.length <= 3000
1 <= k <= s.length
s consists only of lowercase English letters.

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