diff --git a/daily/June15.cpp b/daily/June15.cpp
new file mode 100644
index 0000000..4d7e824
--- /dev/null
+++ b/daily/June15.cpp
@@ -0,0 +1,26 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+ public:
+  /**
+   * @brief LC: 2779: max beauty of array [M]
+   * Time: O(nlogn), Space: O(1), no other ds introduced
+   * Sliding Windows,
+   *
+   * @param nums
+   * @param k
+   * @return int
+   */
+  int maximumBeauty(vector<int>& nums, int k) {
+    sort(nums.begin(), nums.end());
+    int ans = 0, le = 0;
+    for (int ri = 0; ri < nums.size(); ri++) {
+      while (nums[ri] - nums[le] > k * 2) {
+        le++;
+      }
+      ans = max(ans, ri - le + 1);
+    }
+    return ans;
+  }
+};
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