Sign in Enroll free

DSA Visualizer · 25 visualizationsContains Duplicate

Arrays & Hashing

Two Sum Valid Anagram Contains DuplicatePlaying Group Anagrams Top K Frequent Elements Product of Array Except Self Longest Consecutive Sequence

Stack

Valid Parentheses

Binary Search

Linked List

Reverse Linked List Merge Two Sorted Lists

Dynamic Programming

Maximum Subarray Coin Change Climbing Stairs

Trees & BFS

Binary Tree Level Order

Graphs

Number of Islands

Trees

Invert Binary Tree

Two Pointers

Valid Palindrome 3Sum Container With Most Water Trapping Rain Water

Sliding Window

Best Time to Buy and Sell Stock Longest Substring Without Repeating Characters Longest Repeating Character Replacement Permutation in String

EasyArrays & Hashing

Contains Duplicate

Given an integer array nums, return true if any value appears at least twice, and false if every element is distinct.

The step-through player is coming for this one. Two Sum has the full animation today; the rest are being authored in the admin.

Pythontime O(n) · space O(n)

def containsDuplicate(nums: list[int]) -> bool:
    return len(nums) != len(set(nums))

Next upGroup Anagrams

Two Sum is free. Enroll to unlock every visualization and save where you stopped.Enroll free

Watch the video walkthrough