Coding a Basic QA Problem

EasyPython

Problem

Write a code to solve a basic programming problem related to the role.

Implement def first_repeated(nums):, which receives a list of integers and returns the first value whose second occurrence is encountered while scanning left to right, or -1 if every value is unique. For example, [4, 1, 3, 4, 2] returns 4, while [1, 2, 3] returns -1. The input contains 1 to 5,000 integers, and values range from -10^9 to 10^9.

Constraints

1 <= len(nums) <= 5,000
-10^9 <= nums[i] <= 10^9
Return the first value encountered for the second time
Return -1 when all values are unique

Function Signature

def first_repeated(nums):

CodePython 3

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