Leetcode Problem 2516. Take K of Each Character From Left and Right

2516. Take K of Each Character From Left and Right

Leetcode Solutions

Sliding Window Approach

  1. Initialize a counter to count the occurrences of 'a', 'b', and 'c' in the string.
  2. Check if it's possible to have at least k of each character. If not, return -1.
  3. Use two pointers to represent the sliding window: left and right.
  4. Initialize left to 0 and right to the length of the string minus 1.
  5. While left is less than or equal to right, do the following: a. Check if the current window is valid (i.e., outside the window, there are at least k of each character). b. If valid, update the result with the current window size and move the left pointer to the right (shrink the window from the left). c. If not valid, move the right pointer to the left (shrink the window from the right).
  6. Return the minimum number of minutes needed, which is the length of the string minus the length of the longest valid substring that can be removed.
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Two-Pointer Approach

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