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+# 2016. Maximum Difference Between Increasing Elements
+
+"""
+given a 0-indexed integer array 'nums' of size 'n', find the maximum
+difference between 'nums[i]' and 'nums[j]' (ie. 'nums[j] - nums[i]') such
+that '0 <= i < j < n' and 'nums[i] < nums[j]'. return the maximum difference.
+if no such 'i' and 'j' exist, return -1
+"""
+
+
+class Solution(object):
+ def maximumDifference(self, nums):
+ """
+ :type nums: List[int]
+ :rtype: int
+ """
+ minn, ans = nums[0], -1
+ for i in range(len(nums)):
+ ans = max(ans, nums[i] - minn)
+ minn = min(minn, nums[i])
+ return ans if ans != 0 else -1
+
+
+if __name__ == "__main__":
+ obj = Solution()
+ print(obj.maximumDifference(nums=[7, 1, 5, 4]))
+ print(obj.maximumDifference(nums=[9, 4, 3, 2]))
+ print(obj.maximumDifference(nums=[1, 5, 2, 10]))