diff --git a/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num2379.java b/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num2379.java
new file mode 100644
index 0000000..2130bf1
--- /dev/null
+++ b/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num2379.java
@@ -0,0 +1,39 @@
+package com.cool.ling_cha_mount.sliding_windows;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Author: Cool
+ * @Date: 2024/10/06/9:23
+ * @Description: 2379. 得到 K 个黑块的最少涂色次数
+ * DayNumber 1
+ * Hard 1
+ * Level 3
+ */
+public class Num2379 {
+
+    public int minimumRecolors(String blocks, int k) {
+        int blackNum=0;
+        int maxBlack=0;
+        for(int i=0;i<k;i++){
+            if(blocks.charAt(i)=='B'){
+                blackNum++;
+            }
+        }
+        if(blackNum==k){
+            return 0;
+        }
+        maxBlack=blackNum;
+        for(int i=k;i<blocks.length();i++){
+            if(blocks.charAt(i-k)=='B'){
+                blackNum--;
+            }
+            if(blocks.charAt(i)=='B'){
+                blackNum++;
+            }
+            maxBlack=Math.max(maxBlack,blackNum);
+        }
+        return k-maxBlack;
+    }
+
+}