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Grokking the Coding Interview Patterns

Two Sum

Explore how to solve the Two Sum problem by identifying two indices whose values sum to a given target. Understand problem constraints and apply a linear time solution to efficiently tackle this common coding interview challenge.

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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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