Create decrease-elements-to-make-array-zigzag.cpp

Author: kamyu104

C++/decrease-elements-to-make-array-zigzag.cpp

@@ -0,0 +1,15 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    int movesToMakeZigzag(vector<int>& nums) {
+        vector<int> result(2);
+        for (int i = 0; i < nums.size(); ++i) {
+            const auto& left = (i - 1 >= 0) ? nums[i - 1] : numeric_limits<int>::max();
+            const auto& right = (i + 1 < nums.size()) ? nums[i + 1] : numeric_limits<int>::max();
+            result[i % 2] += max(nums[i] - min(left, right) + 1, 0);
+        }
+        return *min_element(result.cbegin(), result.cend());
+    }
+};