Create maximum-sum-score-of-array.cpp

Author: kamyu104

C++/maximum-sum-score-of-array.cpp

@@ -0,0 +1,34 @@
+// Time:  O(n)
+// Space: O(1)
+
+// prefix sum, math
+class Solution {
+public:
+    long long maximumSumScore(vector<int>& nums) {
+        int64_t result = numeric_limits<int>::min();
+        int64_t prefix = 0, suffix = 0;
+        for (int left = 0, right = size(nums) - 1; left < size(nums); ++left, --right) {
+            prefix += nums[left];
+            suffix += nums[right];
+            result = max({result, prefix, suffix});
+        }
+        return result;
+    }
+};
+
+// Time:  O(n)
+// Space: O(1)
+// prefix sum
+class Solution2 {
+public:
+    long long maximumSumScore(vector<int>& nums) {
+        const int64_t total = accumulate(cbegin(nums), cend(nums), 0ll);
+        int64_t result = numeric_limits<int>::min();
+        int64_t prefix = 0;
+        for (const auto& x : nums) {
+            prefix += x;
+            result = max({result, prefix, total - prefix + x});
+        }
+        return result;
+    }
+};