Leetcode Problem 2030. Smallest K-Length Subsequence With Occurrences of a Letter

2030. Smallest K-Length Subsequence With Occurrences of a Letter

Leetcode Solutions

Greedy Approach with Monotonic Stack

  1. Initialize a stack to build the subsequence, a counter for the number of times letter has been added to the stack, and a counter for the number of letter remaining in the string.
  2. Iterate through each character in the string s.
  3. While the stack is not empty and the current character is smaller than the top of the stack, and we can still remove characters to achieve length k, and we have enough occurrences of letter, pop the stack.
  4. If the stack size is less than k, and the current character is letter or we have enough space to include the required repetitions of letter, push the current character onto the stack.
  5. If the current character is letter, decrement the counter for the number of letter remaining.
  6. After the iteration, if the stack size is greater than k, pop the extra characters.
  7. Build the result from the stack and return it.
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Dynamic Programming with Memoization

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