How should I practice Contains Duplicate?

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

Is Contains Duplicate associated with Capgemini?

FastPrep tags this as a Capgemini phone screen coding practice problem when the problem catalog has that company and stage context.

Contains Duplicate

Capgemini● MediumFULLTIMEPHONE SCREEN

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Problem statement

Return true when any integer appears at least twice in nums; otherwise return false.

Function

containsDuplicate(nums: int[]) → boolean

Examples

Example 1

nums = [1,2,3,1]return = true

Case 1 exercises the documented deterministic contract.

Example 2

nums = [1,2,3,4]return = false

Case 2 exercises the documented deterministic contract.

Example 3

nums = [1,1]return = true

Case 3 exercises the documented deterministic contract.

Constraints

1 <= nums.length <= 200000.
-10^9 <= nums[i] <= 10^9.