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Grokking the Coding Interview Patterns in C#

Two Sum

Understand how to identify two indices in an integer array that sum to a target value without using the same index twice. Explore the Two Sum coding pattern, its constraints, and optimize your solution to run in linear time with efficient space usage. This lesson helps you build core skills to solve common coding interview problems 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 ≤104\leq 10^4
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