Solved 2 sum problem in CPP #7310

[sourabhsinghrajput45]

Added 2Sum problem solution using C++ with unordered_map for O(n) time complexity

Problem

2 sum problem in CPP #7310

Solution

Implemented the 2Sum algorithm using an unordered_map to achieve O(n) time complexity by storing complements and checking for matches during iteration.

Changes Proposed

• Added twoSum function to solve the 2Sum problem.
• Utilized unordered_map to track the complements of numbers in the input array.
• Return the indices of the two numbers that sum to the target.

Other Changes

• Refactored the main function to test the solution.