How should I practice Build Maximum Integer from Subsequence (Google India)?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Google phone screen problems in FastPrep.

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Build Maximum Integer from Subsequence (Google India)

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Problem statement

You are given an array nums of decimal digits and an integer k.

Choose exactly k elements at strictly increasing indices, then concatenate the chosen digits in their original order to form an integer. Leading zeroes are allowed and do not change the integer's numeric value.

Return the largest integer that can be formed.

Function

buildMaximumInteger(nums: int[], k: int) → int

Examples

Example 1

nums = [4, 9, 0, 2]k = 2return = 92

Choose digits 9 and 2 at indices 1 and 3. They preserve their original order and form the maximum value 92.

Constraints

1 <= k <= min(nums.length, 9)
0 <= nums[i] <= 9