3Sum Problem Explained – Optimal O(n²) Solution with Two Pointers
The 3Sum problem is a classic array and two-pointer interview question frequently asked in technical interviews at top tech companies. In this guide, we explore how to find all unique triplets in an array that sum to zero.
Create Target Array in the Given Order
Build a target array by inserting each nums[i] at the position given by index[i]. This common interview problem tests your ability to manipulate arrays and understand data structures. A direct simulation using list insertion is simple, but beware of the O(n²) complexity due to shifting.
Find Two Numbers that Sum to Target (Two Sum Problem)
The Two Sum problem is a classic coding challenge that often appears in technical interviews at top tech companies. It's a great way to assess a programmer's understanding of fundamental algorithms and data structures.
Best Time to Buy and Sell Stock
The Best Time to Buy and Sell Stock problem is a frequently asked coding challenge in technical interviews at leading tech companies. It effectively evaluates a candidate’s grasp of array manipulation, algorithmic thinking, and the ability to optimize for time and space efficiency.
Hello, World!
Hello, World!