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115 docs tagged with "hard"

Accounts Merge

Alien Dictionary

All Nodes Distance K in Binary Tree

Articulation Point

Assign Cookies

Bellman Ford

Best Time to Buy and Sell Stock with Transaction Fee

Binary Search Tree Iterators

Bridge in a Graph

Burning Tree

Burst Balloons

But and Sell Stock - III

Buy and Sell Stock - I

Buy and Sell Stock - II

Buy and Sell Stock - IV

Buy and Sell Stock with Cooldown

Candy

Cheapest flight with K Stops

Check for Children Sum Properties

Check for Children Sum Property - II

Coin Change - II

Construct Binary Tree from Inorder and Postorder Traversal

Construct Binary Tree from Preorder and Inorder Traversal

Copy List with Random Pointer

Count and Say

Count inversions in an array

Count Square Submatrices with All Ones

Count the number of subarrays with given xor K

Course Schedule-I

Course Schedule-II

Cycle Detection in Directed Graph using BFS

Delete Operation for Two Strings

Design Twitter

Disjoint Set (Union By Rank/Size)

Distinct Subsequences

Edit Distance

Expression Add Operator

Find Eventual Safe Nodes

Find Median from Data Stream

Find the City With the Smallest Number of Neighbors at a Threshold Distance

Find the repeating and missing numbers

Flatten Binary Tree to Linked List

Flattening a Linked List

Flloyd Warshall

Four Sum

Implement Trie - I

Implement Trie - II

K-th element of two Arrays

Kosaraju’s Algorithm

Kruskal’s Algorithm

Largest Binary Search Tree

Largest Divisible Subset

Largest Rectangle in Histogram

Longest Bitonic Sequence

Longest Common Subsequence

Longest Common Substring

Longest Increasing Sequence using Binary Search

Longest Increasing Subsequence

Longest Pallindromic Subsequence

Longest String Chain

LRU Cache Problem

M-Coloring Problem

Making A Large Island

Matrix Chain Multiplication

Matrix Chain Multiplication (Tabulation)

Maximal Rectangle

Maximal Rectangle

Median in a row-wise sorted Matrix

Median of two sorted array

Merge two Sorted Arrays Without Extra Space

Minimum Add to Make Parentheses Valid

Minimum Coins

Minimum Cost to Cut a Stick

Minimum Insertion Steps to Make a String Palindrome

Minimum Multiplications to reach End

Minimum Window Subsequence

Minimum Window Substring

Most Stones Removed with Same Row or Column

N Queens

Number of Distinct Islands

Number of Enclave

Number of Islands - II

Number of Longest Increasing Subsequence

Number of Operations to Make Network Connected

Optimal Binary Search Tree

Pallindromic Partitioning - III

Parsing A Boolean Expression

Partition Array for Maximum Sum

Permutation Sequence

Prim’s Algorithm

Print LCS

Printing Longest Increasing Subsequence

Rat in a Maze

Recover Binary Search Tree

Repeated String Match (Rabin Karp)

Reverse a Linked List in Group of Size K

Reverse Pairs

Rod Cutting

Serialize and Deserialize Binary Tree

Shortest Common Supersequence

String Compression - II

String to Integer (atoi)

Subarrays with K Different Integers

Sudoku Solver

Surrounded Region (DFS)

Swim in Rising Water

Topological Sort

Topological Sort (Kahn’s Algo)

Trap Rain Water

Two Sum in Binary Search Tree

Unbounded Knapsack

WildCard Matching

Word Break

Word Ladder - I

Word Ladder - II