diff --git a/25/12/3075.cpp b/25/12/3075.cpp
new file mode 100644
index 0000000..485ba65
--- /dev/null
+++ b/25/12/3075.cpp
@@ -0,0 +1,18 @@
+#include <algorithm>
+#include <vector>
+
+class Solution {
+public:
+  long long maximumHappinessSum(std::vector<int> &happiness, int k) {
+    long long ans = 0;
+    std::sort(happiness.begin(), happiness.end(),
+              [](int a, int b) { return a > b; });
+    for (int i = 0; i < k && i < happiness.size(); i++) {
+      if (happiness[i] < i) {
+        break;
+      }
+      ans += happiness[i] - i;
+    }
+    return ans;
+  }
+};
\ No newline at end of file