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Grokking the Coding Interview Patterns

Two Sum

Understand how to solve the Two Sum problem by identifying the right indices in an array that sum to a given target. Explore an optimal approach that runs in linear time and uses space effectively, enhancing your problem-solving skills in coding interviews.

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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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