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Solution: Find Two Numbers That Add Up to K

Explore methods to identify two numbers in an array whose sum equals a target value. This lesson covers the naive approach with nested loops, the efficient two-pointer technique after sorting, and a binary search solution. Understand each method's algorithm and analyze their time and space complexities to gain practical problem-solving skills in Java arrays.

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:

  • 22 \leq nums.length 103\leq10^3

  • 105-10^5\leq nums[i] 105\leq 10^5

  • 105-10^5\leq ...