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Leetcode Problem 2379. Minimum Recolors to Get K Consecutive Black Blocks

2379. Minimum Recolors to Get K Consecutive Black Blocks

Leetcode Solutions

Sliding Window Approach

  1. Initialize start and end pointers to 0, whiteCount to 0, and minOperations to the maximum possible value.
  2. Iterate over the string blocks using the end pointer.
  3. If the current block at end is white, increment whiteCount.
  4. If the window size is less than k, move the end pointer to the right.
  5. If the window size is exactly k, update minOperations with the minimum of its current value and whiteCount.
  6. If the block at start is white, decrement whiteCount as it is no longer in the window.
  7. Move the start pointer to the right to slide the window.
  8. Repeat steps 3-7 until end reaches the end of the string.
  9. Return minOperations as the result.
UML Thumbnail

Brute Force Approach

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