Class Solution

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    public final class Solution
    
                        

    2379 - Minimum Recolors to Get K Consecutive Black Blocks.

    Easy

    You are given a 0-indexed string blocks of length n, where blocks[i] is either 'W' or 'B', representing the color of the <code>i<sup>th</sup></code> block. The characters 'W' and 'B' denote the colors white and black, respectively.

    You are also given an integer k, which is the desired number of consecutive black blocks.

    In one operation, you can recolor a white block such that it becomes a black block.

    Return the minimum number of operations needed such that there is at least one occurrence of k consecutive black blocks.

    Example 1:

    Input: blocks = "WBBWWBBWBW", k = 7

    Output: 3

    Explanation:

    One way to achieve 7 consecutive black blocks is to recolor the 0th, 3rd, and 4th blocks so that blocks = "BBBBBBBWBW".

    It can be shown that there is no way to achieve 7 consecutive black blocks in less than 3 operations.

    Therefore, we return 3.

    Example 2:

    Input: blocks = "WBWBBBW", k = 2

    Output: 0

    Explanation:

    No changes need to be made, since 2 consecutive black blocks already exist.

    Therefore, we return 0.

    Constraints:

    • n == blocks.length

    • 1 &lt;= n &lt;= 100

    • blocks[i] is either 'W' or 'B'.

    • 1 &lt;= k &lt;= n

    • Nested Class Summary

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      Modifier and Type Class Description
    • Field Summary

      Fields 
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    • Constructor Summary

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      Constructor Description
      Solution()
    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
    • Method Summary

      Modifier and Type Method Description
      final Integer minimumRecolors(String blocks, Integer k)
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait