diff --git a/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num1052.java b/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num1052.java
new file mode 100644
index 0000000..695dd6f
--- /dev/null
+++ b/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num1052.java
@@ -0,0 +1,43 @@
+package com.cool.ling_cha_mount.sliding_windows;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Author: Cool
+ * @Date: 2024/10/08/14:39
+ * @Description: 1052. 爱生气的书店老板
+ * Hard 2
+ * Level 4
+ * Score 1418
+ */
+public class Num1052 {
+
+    public int maxSatisfied(int[] customers, int[] grumpy, int minutes) {
+        int sum=0;
+        int non=0;
+        int all=0;
+        for(int i=0;i<minutes;i++){
+            if(grumpy[i]==1){
+                sum+=customers[i];
+                non+=customers[i];
+            }
+            all+=customers[i];
+        }
+        int res=sum;
+        for(int i=minutes;i<customers.length;i++){
+            if(grumpy[i-minutes]==1){
+                sum-=customers[i-minutes];
+            }
+            all+=customers[i];
+            if(grumpy[i]==1){
+                non+=customers[i];
+                sum+=customers[i];
+            }
+            res=Math.max(res,sum);
+        }
+        non-=res;
+        all-=non;
+        return all;
+    }
+
+}