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Grokking the Coding Interview Patterns in Go

Two Sum

Explore how to identify two indices in an integer array whose values sum to a given target while ensuring you use each index only once. Understand the problem constraints and implement an optimal O(n) time and space solution. This lesson helps you apply a common coding interview pattern effectively.

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Statement

For the given array of integers arr and a target t, you have to identify the two indices that add up to generate the target t. Moreover, you can’t use the same index twice, and there will be only one solution.

Note: We will assume that the array is zero-indexed and the output order doesn’t matter.

Constraints:

  • 2≤2 \leq arr.length ≤103\leq 10^3
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