Leetcode Problem 2842. Count K-Subsequences of a String With Maximum Beauty

2842. Count K-Subsequences of a String With Maximum Beauty

Leetcode Solutions

Combinatorics and Frequency Counting

  1. Count the frequency of each character in the string.
  2. Sort the frequencies in descending order.
  3. If k is greater than the number of unique characters, return 0.
  4. Calculate the maximum beauty by summing the k highest frequencies.
  5. Count the number of characters that have the same frequency as the k-th character.
  6. Use combinatorial logic to calculate the number of ways to choose the remaining characters to form k-subsequences.
  7. Return the total count modulo 1e9+7.
UML Thumbnail

Dynamic Programming with Frequency Counting

Ask Question

Programming Language
image/screenshot of info(optional)
Full Screen
Loading...

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...