Package g3301_3400.s3325_count_substrings_with_k_frequency_characters_i

Class Solution

java.lang.Object
g3301_3400.s3325_count_substrings_with_k_frequency_characters_i.Solution
public class Solution extends Object
3325 - Count Substrings With K-Frequency Characters I.

Medium

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.

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • numberOfSubstrings

      public int numberOfSubstrings(String s, int k)