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UMPIRE Problem Solutions
Raymond Chen edited this page Apr 24, 2023
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- Reverse a Doubly Linked List
- Swap Nodes In Pairs
- Rotate List
- LRU Cache
- Spiral Matrix IV
- Reverse Nodes in k-Group
- Remove Duplicates from Sorted List
- Linked List Cycle
- Merge Two Sorted Lists
- Remove Duplicates from Sorted List II
- Remove Nth Node from End of List
- Add Two Numbers
- Middle of the Linked List
- Reverse Linked List II
- Reverse Linked List
- Linked List Cycle II
- Remove Linked List Elements
- Palindrome Linked Lists
- Add Two Numbers II
- Min Stack
- Implement Queue Using Stacks
- Find a Celebrity
- Dinner Plate Stacks
- Evaluate Reverse Polish Notation
- Valid Parentheses
- Sort a stack using a temporary stack
- Score of Parentheses
- Validate Stack Sequences
- Decode String
- Number of People That Can Be Seen in a Grid
- Crawler Log Folder
- Number of Recent Calls
- Implement Queue Using Stacks
- Implement Stack Using Queue
- Moving Average from Data Stream
- Number of Students Unable to Eat Lunch
- Kth Largest Element in a Stream
- K Closest Points to the Origin
- Find K Pairs with Smallest Sums
- Last Stone Weight
- Kth Largest Element in an Array
- Brick Wall
- Word Pattern
- Encode and Decode TinyURL
- Single Number
- Element with a frequency of K
- Longest Consecutive Sequence
- Majority Element
- Roman to Integer
- Destination City
- Number of Arithmetic Triplets
- Substring
- Valid Palindrome
- Reverse Words in a String
- String to Integer (ATOI)
- Plus One
- Run Length Encoding
- Shortest Unsorted Subarray
- Word Frequency
- Reverse a String
- Shifting Letters
- Set Matrix Zeros
- Longest Repeating Character Replacement
- Group Anagrams
- Trapping Rain Water
- Max Chunks To Make Sorted
- Basic Calculator
- Asteroid Collision
- Two Sum
- Integer to String
- Contain Duplicates
- Reverse Words in a String II
- Squares of a Sorted Array
- Unique Number of Occurrences
- Merge Sorted Array
- Word Frequency
- Find Subsequence of Length K With the Largest Sum
- Is Subsequence
- Sort Colors
- Product of Array Except Self
- Container With Most Water
- Merge Intervals
- 3Sum
- Crawler Log Folder
- Shortest Distance to a Character
- Flood Fill
- 01 Matrix
- Word Search II
- Rotting Oranges
- Spiral Matrix
- Number of Islands
- Island Perimeter
- Transpose Matrix
- Flipping an Image
- Rotate Image
- Number of Islands
- Max Area of Island
- Battleships in a Board
- Search a 2D Matrix
- Lucky Numbers in a Matrix
- Pacific Atlantic Water Flow
- Binary Search
- First Bad Version
- Sqrt(x)
- Find Minimum in Rotated Sorted Array
- Search in Rotated Sorted Array
- Guess Number Higher or Lower
- Koko Eating Bananas
- Min Depth of Binary Trees
- Binary Tree Pruning
- Vertical Order Traversal of a Binary Tree
- Find Duplicate Subtrees
- Most Frequent Subtree Sum
- Convert Sorted Array to Binary Search Tree
- Flatten Binary Tree to Linked List
- Find Largest Value in Each Tree Row
- Same Trees
- Insert into a Binary Search Tree
- Print Binary Tree
- Binary Tree Paths
- Convert Sorted List to BST
- Invert Binary Tree
- Maximum Depth of Binary Tree
- Diameter of Binary Tree
- Balanced Binary Tree
- Binary Tree Inorder Traversal
- Symmetric Tree
- Minimum Depth of Binary Tree
- Path Sum
- Binary Tree Preorder Traversal
- Sum of Left Leaves
- Binary Tree Level Order Traversal
- Lowest Common Ancestor of a Binary Tree
- Binary Tree Right Side View
- Construct Binary Tree from Preorder and Inorder Traversal
- Distribute Coins in Binary Tree
- Path Sum III
- Kth Smallest Element in a BST
- Count Good Nodes in Binary Tree
- Validate Binary Search Tree
- All Nodes Distance K in Binary Tree
- Add One Row to Tree
- Time Needed to Inform All Employees
- Number of Islands
- Flood Fill
- 01 Matrix
- Word Search
- Rotting Oranges
- Accounts Merge
- Maximal Network Rank
- Number of Connected Components
- Keys and Rooms
- Minimum Knight Moves
- Shortest Path to Get Food
- Course Schedule
- Minimum Height Trees
- Word Ladder
- Reconstruct Itinerary
- Swim in Rising Water
- Cheapest Flights Within K Stops
- Finish All Tasks
- Evaluate Division
- Most Stones Removed
- Clone Graph
- Connecting Cities With Minimum Cost
- The Earliest Moment When Everyone Become Friends
- Accounts Merge
- Maximal Network Rank
- Clone Graph
- Find Eventual Safe States
- Find the Town Judge
- Find Center of Star Graph
- Find if Path Exists in Graph
- Number of Good Paths
- The Time When the Network Becomes Idle
- Maximum Subarray
- Word Break
- Longest Palindromic Substring
- Unique Paths
- Maximal Rectangle
- Climbing Stairs
- Minimum Path Sum
- House Robber
- Fibonacci Number
- Min Cost Climbing Stairs
- Best Time to Buy and Sell Stock
- Pascal's Triangle
- Pascal's Triangle II
- Shopping Offers
- Dungeon Game