What is Decimal Number System?
Long ago, humans created a number system that has precisely ten digits. This number system is called the Decimal Number System, and the digits in this number system are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leetcode 217: Contains Duplicate
This lesson will teach you how to find the duplicate element using a hashing algorithm.
