Create reverse-subarray-to-maximize-array-value.py

Author: kamyu104

Python/reverse-subarray-to-maximize-array-value.py

@@ -0,0 +1,18 @@
+# Time:  O(n)
+# Space: O(1)
+
+class Solution(object):
+    def maxValueAfterReverse(self, nums):
+        """
+        :type nums: List[int]
+        :rtype: int
+        """
+        result, add, max_pair, min_pair = 0, 0, float("-inf"), float("inf")
+        for i in xrange(1, len(nums)):
+            result += abs(nums[i-1]-nums[i])
+            add = max(add,
+                      abs(nums[0]-nums[i]) - abs(nums[i-1]-nums[i]),
+                      abs(nums[-1]-nums[i-1]) - abs(nums[i-1]-nums[i]))
+            min_pair = min(min_pair, max(nums[i-1], nums[i]))
+            max_pair = max(max_pair, min(nums[i-1], nums[i]))
+        return result + max(add, (max_pair-min_pair)*2)