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Grokking the Coding Interview Patterns in JavaScript

Two Sum

Explore how to identify two indices in an integer array that add up to a given target without reusing indices. Understand constraints, verify problem comprehension, and implement an optimal O(n) time solution. This lesson helps develop key problem-solving skills for coding interviews using JavaScript.

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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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