Create last-stone-weight.cpp

Author: kamyu104

C++/last-stone-weight.cpp

@@ -0,0 +1,18 @@
+// Time:  O(nlogn)
+// Space: O(n)
+
+class Solution {
+public:
+    int lastStoneWeight(vector<int>& stones) {
+        priority_queue<int> max_heap;
+        for (const auto& x : stones) {
+            max_heap.emplace(x);
+        }
+        for (int i = 0; i + 1 < stones.size(); ++i) {
+            auto x = max_heap.top(); max_heap.pop();
+            auto y = max_heap.top(); max_heap.pop();
+            max_heap.emplace(abs(x - y));
+        }
+        return max_heap.top();
+    }
+};