Array & List Manipulation

Two Pointers Algorithm

Master the Two Pointers technique for optimizing solutions to array and list-based problems. This guide covers key patterns and provides AI-powered insights.

Two Sum II - Input Array is Sorted

A classic example of the two-pointers pattern with pointers at opposite ends. Given a sorted array, find two numbers that add up to a specific target.

function twoSum(numbers, target) { let left = 0; let right = numbers.length - 1; while (left < right) { let sum = numbers[left] + numbers[right]; if (sum === target) { return [left + 1, right + 1]; } else if (sum < target) { left++; } else { right--; } } }
AI Coach Hint: The sorted nature of the input array is the key giveaway to use the two-pointers from opposite ends. If the sum is too small, you need a larger number, so you move the left pointer. If the sum is too large, you need a smaller number, so you move the right pointer.

Related Algorithm Guides

Explore more algorithm interview guides powered by AI coaching

Intelligent Interview Preparation Tracking
AI-powered interview preparation guide
Remote Coding Interview Screen Sharing Tips
AI-powered interview preparation guide
Union Find Dsu Interview Questions
AI-powered interview preparation guide
Workplace Transformation Interview Questions
AI-powered interview preparation guide