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Grokking the Coding Interview Patterns in Python

Two Sum

Understand how to solve the Two Sum problem by identifying pairs of indices that add up to a given target without repeating indices, using an optimal O(n) time and space approach. This lesson helps develop skills necessary for coding interviews by applying algorithm efficiency and problem-solving patterns.

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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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