How should I practice Maximum Later Difference?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Apple online assessment problems in FastPrep.

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Maximum Later Difference

Apple● EasyNEW GRADOA

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Problem statement

Choose indices i < j in nums such that nums[j] > nums[i]. Return the largest possible difference nums[j] - nums[i].

Return -1 when no strictly positive later-minus-earlier difference exists. Equal values do not form a valid pair.

Function

maximumLaterDifference(nums: int[]) → int

Examples

Example 1

nums = [3,6,10,1,4,6,5]return = 7

The value ten appears after three, producing the source example's difference seven.

Example 2

nums = [5,5,4]return = -1

All later differences are zero or negative.

Constraints

1 <= nums.length <= 10^5.
-10^9 <= nums[i] <= 10^9.