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Data Structures for Coding Interviews in Java

Solution: Find Two Numbers That Add up to k—Hashing

Explore how to find two numbers in an array that sum to a given target by implementing hash-based solutions in Java. Understand solutions using hash maps and sets, their code implementations, and analyze their time and space efficiency. This lesson equips you with practical hashing techniques essential for coding interviews.

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Statement

Given an array of integers nums and an integer target, k, find two numbers in the array that sum up to the target k.

There is exactly one solution for each input, and each element of the array can only be used once in the solution. The order of the returned elements does not matter.

Constraints:

  • 2≤2 \leq nums.length ≤103\leq10^3

  • −105≤-10^5\leq ...