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Solution: Concatenation of Array

Explore how to construct a new array by appending an input array to itself, efficiently tracking index positions. Understand the implementation with a single iteration and grasp its linear time and space complexity characteristics.

Statement

Given an integer array nums of length n, construct an array ans of length 2n2n such that ans[i] == nums[i] and ans[i + n] == nums[i] for 00 \leq i << n (0-indexed).

In other words, ans is formed by appending nums to itself.

Return the array ans.

Constraints:

  • n ==== nums.length ...