68. Two Sum

Medium

Topics

Companies

Helpful tools to learn & understand

Watch key transitions, pointers, and variables update step-by-step.

Open

Read clean, documented implementations across multiple patterns.

View Code

Sketch diagrams on an infinite canvas and draft notes directly inline.

Draw

Input: nums = [2,7,11,15], target = 9

Output: [0,1]

Explanation: Because nums[0] + nums[1] == 9, we return [0, 1]

Input: nums = [3,2,4], target = 6

Output: [1,2]

Input: nums = [3,3], target = 7

Output: [-1,-1]

Time Complexity

O(n)

Space Complexity

O(n)