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Solution: Find Two Numbers That Add Up to K

Explore multiple strategies to solve the problem of finding two numbers in a Java array that add up to a given target k. Understand and implement the naive nested loop, two-pointer, and binary search methods, and learn their time and space complexities to optimize your coding interview solutions.

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 ...