diff --git a/3147. Taking Maximum Energy From the Mystic Dungeon b/3147. Taking Maximum Energy From the Mystic Dungeon
new file mode 100644
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+++ b/3147. Taking Maximum Energy From the Mystic Dungeon	
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+class Solution {
+public:
+    int maximumEnergy(vector<int>& energy, int k) {
+        int n = energy.size();
+
+        // Accumulate energy backwards for each k-group
+        for (int i = 0; i < k; i++) {
+            for (int j = n - i - 1; j >= k; j -= k) {
+                energy[j - k] += energy[j];
+            }
+        }
+
+        // Find the maximum accumulated energy
+        int maxa = INT_MIN;
+        for (int i = 0; i < n; i++) {
+            maxa = max(maxa, energy[n - i - 1]);
+        }
+
+        return maxa;
+    }
+};