Create find-the-minimum-amount-of-time-to-brew-potions.cpp

Author: kamyu104

C++/find-the-minimum-amount-of-time-to-brew-potions.cpp

@@ -0,0 +1,20 @@
+// Time:  O(n * m)
+// Space: O(1)
+
+// prefix sum, greedy
+class Solution {
+public:
+    long long minTime(vector<int>& skill, vector<int>& mana) {
+        int64_t result = 0;
+        for (int i = 1; i < size(mana); ++i) {
+            int64_t prefix = 0, mx = 0;
+            for (const auto& x : skill) {
+                prefix += x;
+                mx = max(mx, mana[i - 1] * prefix - mana[i] * (prefix - x));
+            }
+            result += mx;
+        }
+        result += mana.back() * accumulate(cbegin(skill), cend(skill), 0ll);
+        return result;
+    }
+};