1. Two Sum#1
Easy📊 Arrays & HashingHash Map Lookup
Given an array of integers and a target, return the indices of two numbers that add up to the target.
Examples
Example 1:
Input: [[2,7,11,15],9]
Output: [0,1]
Example 2:
Input: [[3,2,4],6]
Output: [1,2]
Example 3:
Input: [[3,3],6]
Output: [0,1]
Why learn this
THE most famous LeetCode problem. Teaches the fundamental hash map lookup pattern used everywhere.
ArraysHash MapsComplement Pattern
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