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Grokking the Coding Interview Patterns in C++

Two Sum

Explore how to solve the Two Sum problem by identifying indices in an array whose values add up to a given target. Learn to apply efficient O(n) time and O(n) space solutions using hash maps, helping you build confidence in tackling common interview challenges.

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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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