@@ -0,0 +1,11 @@
+var minimumRecolors = function(blocks, k) {
+let blackCount = 0, ans = blocks.length;
+
+for (let i = 0; i < blocks.length; i++) {
+if (i - k >= 0 && blocks[i - k] === 'B') blackCount--;
+if (blocks[i] === 'B') blackCount++;
+ans = Math.min(ans, k - blackCount);
+}
+
+return ans;
+};