amzn-30-days

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Easy 0/19
Medium 0/65
Hard 0/16
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Difficulty Title Frequency Acceptance Rate Link Topics
EASY Two Sum 100.0 0.56 View Problem Array, Hash Table
EASY Best Time to Buy and Sell Stock 92.5 0.55 View Problem Array, Dynamic Programming
MEDIUM LRU Cache 92.5 0.45 View Problem Hash Table, Linked List, Design, Doubly-Linked List
MEDIUM Number of Islands 92.5 0.62 View Problem Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
MEDIUM Reorganize String 92.5 0.56 View Problem Hash Table, String, Greedy, Sorting, Heap (Priority Queue), Counting
MEDIUM Maximum Frequency After Subarray Operation 88.8 0.27 View Problem Array, Hash Table, Dynamic Programming, Greedy, Enumeration, Prefix Sum
MEDIUM Longest Palindromic Substring 86.7 0.36 View Problem Two Pointers, String, Dynamic Programming
MEDIUM Add Two Numbers 79.2 0.46 View Problem Linked List, Math, Recursion
MEDIUM Koko Eating Bananas 79.2 0.49 View Problem Array, Binary Search
MEDIUM Longest Substring Without Repeating Characters 79.2 0.37 View Problem Hash Table, String, Sliding Window
MEDIUM Find First and Last Position of Element in Sorted Array 79.2 0.47 View Problem Array, Binary Search
HARD Trapping Rain Water 79.2 0.65 View Problem Array, Two Pointers, Dynamic Programming, Stack, Monotonic Stack
MEDIUM Top K Frequent Elements 76.2 0.65 View Problem Array, Hash Table, Divide and Conquer, Sorting, Heap (Priority Queue), Bucket Sort, Counting, Quickselect
HARD Merge k Sorted Lists 72.7 0.57 View Problem Linked List, Divide and Conquer, Heap (Priority Queue), Merge Sort
MEDIUM Jump Game II 72.7 0.42 View Problem Array, Dynamic Programming, Greedy
MEDIUM Merge Intervals 72.7 0.49 View Problem Array, Sorting
MEDIUM Group Anagrams 72.7 0.71 View Problem Array, Hash Table, String, Sorting
MEDIUM Lowest Common Ancestor of a Binary Tree 72.7 0.67 View Problem Tree, Depth-First Search, Binary Tree
MEDIUM Longest Repeating Character Replacement 72.7 0.57 View Problem Hash Table, String, Sliding Window
HARD Candy 68.7 0.47 View Problem Array, Greedy
MEDIUM Meeting Rooms II 68.7 0.52 View Problem Array, Two Pointers, Greedy, Sorting, Heap (Priority Queue), Prefix Sum
EASY Valid Parentheses 68.7 0.42 View Problem String, Stack
HARD Minimum Window Substring 68.7 0.45 View Problem Hash Table, String, Sliding Window
MEDIUM House Robber 68.7 0.52 View Problem Array, Dynamic Programming
HARD Median of Two Sorted Arrays 68.7 0.44 View Problem Array, Binary Search, Divide and Conquer
MEDIUM Min Stack 64.0 0.56 View Problem Stack, Design
MEDIUM Rotate Image 64.0 0.78 View Problem Array, Math, Matrix
MEDIUM Best Time to Buy and Sell Stock II 64.0 0.70 View Problem Array, Dynamic Programming, Greedy
HARD Concatenated Words 64.0 0.49 View Problem Array, String, Dynamic Programming, Depth-First Search, Trie
MEDIUM Generate Parentheses 64.0 0.77 View Problem String, Dynamic Programming, Backtracking
MEDIUM Search a 2D Matrix 64.0 0.52 View Problem Array, Binary Search, Matrix
MEDIUM Coin Change 64.0 0.46 View Problem Array, Dynamic Programming, Breadth-First Search
MEDIUM Unique Paths 64.0 0.66 View Problem Math, Dynamic Programming, Combinatorics
HARD LFU Cache 64.0 0.47 View Problem Hash Table, Linked List, Design, Doubly-Linked List
MEDIUM Search in Rotated Sorted Array 64.0 0.43 View Problem Array, Binary Search
MEDIUM Next Permutation 64.0 0.43 View Problem Array, Two Pointers
MEDIUM Rotting Oranges 64.0 0.57 View Problem Array, Breadth-First Search, Matrix
MEDIUM Insert Delete GetRandom O(1) 64.0 0.55 View Problem Array, Hash Table, Math, Design, Randomized
EASY Flood Fill 64.0 0.66 View Problem Array, Depth-First Search, Breadth-First Search, Matrix
EASY Fizz Buzz 64.0 0.74 View Problem Math, String, Simulation
MEDIUM Top K Frequent Words 58.2 0.59 View Problem Array, Hash Table, String, Trie, Sorting, Heap (Priority Queue), Bucket Sort, Counting
MEDIUM Integer to Roman 58.2 0.69 View Problem Hash Table, Math, String
EASY Invert Binary Tree 58.2 0.79 View Problem Tree, Depth-First Search, Breadth-First Search, Binary Tree
EASY Move Zeroes 58.2 0.63 View Problem Array, Two Pointers
HARD Basic Calculator 58.2 0.46 View Problem Math, String, Stack, Recursion
MEDIUM Find All Possible Recipes from Given Supplies 58.2 0.56 View Problem Array, Hash Table, String, Graph, Topological Sort
MEDIUM String to Integer (atoi) 58.2 0.19 View Problem String
MEDIUM Capacity To Ship Packages Within D Days 58.2 0.72 View Problem Array, Binary Search
EASY Roman to Integer 58.2 0.65 View Problem Hash Table, Math, String
EASY Palindrome Number 58.2 0.59 View Problem Math
MEDIUM Maximum Subarray 58.2 0.52 View Problem Array, Divide and Conquer, Dynamic Programming
MEDIUM Word Search 58.2 0.45 View Problem Array, String, Backtracking, Depth-First Search, Matrix
MEDIUM Edit Distance 58.2 0.59 View Problem String, Dynamic Programming
MEDIUM Kth Largest Element in an Array 58.2 0.68 View Problem Array, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect
MEDIUM Minimum Equal Sum of Two Arrays After Replacing Zeros 50.9 0.50 View Problem Array, Greedy
EASY Majority Element 50.9 0.66 View Problem Array, Hash Table, Divide and Conquer, Sorting, Counting
HARD Maximum Profit in Job Scheduling 50.9 0.54 View Problem Array, Binary Search, Dynamic Programming, Sorting
EASY Contains Duplicate 50.9 0.63 View Problem Array, Hash Table, Sorting
MEDIUM Product of Array Except Self 50.9 0.68 View Problem Array, Prefix Sum
MEDIUM Combination Sum 50.9 0.75 View Problem Array, Backtracking
MEDIUM Container With Most Water 50.9 0.58 View Problem Array, Two Pointers, Greedy
MEDIUM Number of Provinces 50.9 0.69 View Problem Depth-First Search, Breadth-First Search, Union Find, Graph
MEDIUM Reverse Integer 50.9 0.30 View Problem Math
EASY Single Number 50.9 0.76 View Problem Array, Bit Manipulation
EASY Pascal's Triangle 50.9 0.77 View Problem Array, Dynamic Programming
EASY Min Cost Climbing Stairs 50.9 0.67 View Problem Array, Dynamic Programming
HARD Word Search II 50.9 0.37 View Problem Array, String, Backtracking, Trie, Matrix
EASY Next Greater Element I 50.9 0.75 View Problem Array, Hash Table, Stack, Monotonic Stack
MEDIUM Analyze User Website Visit Pattern 50.9 0.44 View Problem Array, Hash Table, Sorting
HARD Sliding Window Maximum 50.9 0.48 View Problem Array, Queue, Sliding Window, Heap (Priority Queue), Monotonic Queue
HARD Word Ladder 50.9 0.43 View Problem Hash Table, String, Breadth-First Search
MEDIUM Valid Sudoku 50.9 0.62 View Problem Array, Hash Table, Matrix
HARD Integer to English Words 50.9 0.34 View Problem Math, String, Recursion
MEDIUM Course Schedule II 50.9 0.53 View Problem Depth-First Search, Breadth-First Search, Graph, Topological Sort
MEDIUM Pacific Atlantic Water Flow 50.9 0.58 View Problem Array, Depth-First Search, Breadth-First Search, Matrix
MEDIUM Jump Game 50.9 0.39 View Problem Array, Dynamic Programming, Greedy
MEDIUM Validate Binary Search Tree 50.9 0.34 View Problem Tree, Depth-First Search, Binary Search Tree, Binary Tree
HARD Sudoku Solver 50.9 0.64 View Problem Array, Hash Table, Backtracking, Matrix
MEDIUM Find the Duplicate Number 50.9 0.63 View Problem Array, Two Pointers, Binary Search, Bit Manipulation
MEDIUM String Compression 50.9 0.58 View Problem Two Pointers, String
MEDIUM Course Schedule 50.9 0.49 View Problem Depth-First Search, Breadth-First Search, Graph, Topological Sort
MEDIUM Maximize Distance to Closest Person 50.9 0.49 View Problem Array
MEDIUM Spiral Matrix 40.6 0.54 View Problem Array, Matrix, Simulation
MEDIUM Magnetic Force Between Two Balls 40.6 0.71 View Problem Array, Binary Search, Sorting
EASY Happy Number 40.6 0.58 View Problem Hash Table, Math, Two Pointers
EASY Convert Sorted Array to Binary Search Tree 40.6 0.74 View Problem Array, Divide and Conquer, Tree, Binary Search Tree, Binary Tree
MEDIUM Distribute Candies Among Children II 40.6 0.56 View Problem Math, Combinatorics, Enumeration
MEDIUM Find Eventual Safe States 40.6 0.69 View Problem Depth-First Search, Breadth-First Search, Graph, Topological Sort
MEDIUM Combinations 40.6 0.73 View Problem Backtracking
EASY Design Parking System 40.6 0.87 View Problem Design, Simulation, Counting
EASY Divisible and Non-divisible Sums Difference 40.6 0.91 View Problem Math
MEDIUM Rotate List 40.6 0.40 View Problem Linked List, Two Pointers
HARD Largest Rectangle in Histogram 40.6 0.47 View Problem Array, Stack, Monotonic Stack
HARD Design In-Memory File System 40.6 0.48 View Problem Hash Table, String, Design, Trie, Sorting
MEDIUM Decode String 40.6 0.61 View Problem String, Stack, Recursion
MEDIUM Binary Tree Level Order Traversal 40.6 0.71 View Problem Tree, Breadth-First Search, Binary Tree
MEDIUM Subarray Sum Equals K 40.6 0.45 View Problem Array, Hash Table, Prefix Sum
MEDIUM Count Zero Request Servers 40.6 0.34 View Problem Array, Hash Table, Sliding Window, Sorting
MEDIUM K Closest Points to Origin 40.6 0.68 View Problem Array, Math, Divide and Conquer, Geometry, Sorting, Heap (Priority Queue), Quickselect
MEDIUM Evaluate Division 40.6 0.63 View Problem Array, String, Depth-First Search, Breadth-First Search, Union Find, Graph, Shortest Path