lc: add solution for minimum recolors to get k consecutive black blocks

Author: electyrion

src/main/java/com/thealgorithms/leetcode/slidingwindow/minimumrecolorstogetkconsecutiveblackblocks/Solution.java

@@ -0,0 +1,28 @@
+package com.thealgorithms.leetcode.slidingwindow.minimumrecolorstogetkconsecutiveblackblocks;
+
+public class Solution {
+    public int minimumRecolors(String blocks, int k) {
+        int left = 0;
+        int right = 0;
+        int whiteCount = 0;
+        int minRecolors = Integer.MAX_VALUE;
+
+        while (right < blocks.length()) {
+            if (blocks.charAt(right) == 'W') {
+                whiteCount++;
+            }
+
+            if (right - left + 1 == k) {
+                minRecolors = Math.min(minRecolors, whiteCount);
+                if (blocks.charAt(left) == 'W') {
+                    whiteCount--;
+                }
+                left++;
+            }
+            right++;
+        }
+        return minRecolors;
+    }
+}
+
+// https://leetcode.com/problems/minimum-recolors-to-get-k-consecutive-black-blocks/description/