diff --git a/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num1838.java b/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num1838.java
new file mode 100644
index 0000000..9ee47cf
--- /dev/null
+++ b/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num1838.java
@@ -0,0 +1,42 @@
+package com.cool.ling_cha_mount.sliding_windows;
+
+import java.util.Arrays;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Author: Cool
+ * @Date: 2024/10/27/22:48
+ * @Description:
+ */
+public class Num1838 {
+    public int maxFrequency(int[] nums, int k) {
+        Arrays.sort(nums);
+        long l= k;
+        long left = 0;
+        long res = 1;
+        for (int i = 1; i < nums.length; i++) {
+            l -=(nums[i] - nums[i - 1]) *(i - left);
+            while (l < 0) {
+                l += nums[i] - nums[(int)left++];
+            }
+            res = Math.max(res, i - left + 1);
+        }
+        return (int)res;
+    }
+
+    public int maxFrequency1(int[] nums, int k) {
+        Arrays.sort(nums);
+        int left = 0, res = 1;
+        long total = 0;
+        for (int i = 0; i < nums.length; i++) {
+            total += nums[i];
+            while ((long) nums[i] * (i - left + 1) - total > k) {
+                total -= nums[left];
+                left++;
+            }
+            res = Math.max(res, i - left + 1);
+        }
+        return res;
+    }
+}