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README.md

AlgoExpert Solutions

This folder contains solutions to the AlgoExpert problems.

Motivation

Let's create free resources for anyone who wants to solve problems!

Contents

Topics include: Arrays (24), Strings (15), Linked Lists (13), Stacks (6), Searching (Binary Search mostly) (7), Sorting (8), Greedy Algorithms (5), Heaps (5), Famous Algorithms (5), Recursion (13), Binary Search Trees (10), Binary Trees (13), Dynamic Programming (19), Graphs (13), Tries (2).

Difficulty Levels:

  • 🟢 : Easy
  • 🔵 : Medium
  • 🔴 : Hard
  • ⚫ : Very Hard
Problem Statement Difficulty Level Category Solution Link LeetCode Link
Two Number Sum 🟢 Arrays Program.java Link
Validate Subsequence 🟢 Arrays Program.java Link
Tournament Winner 🟢 Arrays Program.java
Non-Constructible Change 🟢 Arrays Program.java Link
Sorted Squared Array 🟢 Arrays Program.java Link
Three Number Sum 🔵 Arrays Program.java Link
Smallest Difference 🔵 Arrays Program.java Link
Move Element To End 🔵 Arrays Program.java Link
Monotonic Array 🔵 Arrays Program.java Link
Spiral Traverse 🔵 Arrays Program.java Link
Longest Peak 🔵 Arrays Program.java Link
Array Of Products 🔵 Arrays Program.java Link
First Duplicate Value 🔵 Arrays Program.java Link
Merge Overlapping Intervals 🔵 Arrays Program.java Link
Four Number Sum 🔴 Arrays Program.java Link
Subarray Sort 🔴 Arrays Program.java Link
Largest Range 🔴 Arrays Program.java Link
Min Rewards 🔴 Arrays Program.java Link
Zigzag Traverse 🔴 Arrays Program.java
Apartment Hunting ⚫ Arrays Program.java Link
Calendar Matching ⚫ Arrays Program.java Link
Waterfall Streams ⚫ Arrays Program.java Link
Minimum Area Rectangle ⚫ Arrays Program.java Link
Line Through Points ⚫ Arrays Program.java Link
Palindrome Check 🟢 Strings Program.java Link
Caesar Cypher Encryptor 🟢 Strings Program.java Link
Run-Length Encoding 🟢 Strings Program.java Link
Generate Document 🟢 Strings Program.java
First Non-Repeating Character 🟢 Strings Program.java
Longest Palindromic Substring 🔵 Strings Program.java
Group Anagrams 🔵 Strings Program.java
Valid IP Addresses 🔵 Strings Program.java
Reverse Words In String 🔵 Strings Program.java
Minimum Characters For Words 🔵 Strings Program.java
Longest Substring Without Duplication 🔴 Strings Program.java
Underscorify Substring 🔴 Strings Program.java
Pattern Matcher 🔴 Strings Program.java
Smallest Substring Containing ⚫ Strings Program.java
Longest Balanced Substring ⚫ Strings Program.java
Remove Duplicates From Linked List 🟢 Linked Lists Program.java
Linked List Construction 🔵 Linked Lists Program.java
Remove Kth Node From End 🔵 Linked Lists Program.java
Sum of Linked Lists 🔵 Linked Lists Program.java
Find Loop 🔴 Linked Lists Program.java
Reverse Linked List 🔴 Linked Lists Program.java
Merge Linked Lists 🔴 Linked Lists Program.java
Shift Linked List 🔴 Linked Lists Program.java
LRU Cache ⚫ Linked Lists Program.java
Rearrange Linked List ⚫ Linked Lists Program.java
Linked List Palindrome ⚫ Linked Lists Program.java
Zip Linked List ⚫ Linked Lists Program.java
Node Swap ⚫ Linked Lists Program.java
Min Max Stack Construction 🔵 Stacks Program.java
Balanced Brackets 🔵 Stacks Program.java
Sunset Views 🔵 Stacks Program.java
Sort Stack 🔵 Stacks Program.java
Shorten Path 🔴 Stacks Program.java
Largest Rectangle Under Skyline 🔴 Stacks Program.java
Binary Search 🟢 Searching Program.java
Find Three Largest Numbers 🟢 Searching Program.java
Search In Sorted Matrix 🔵 Searching Program.java
Shifted Binary Search 🔴 Searching Program.java
Search For Range 🔴 Searching Program.java
Quickselect 🔴 Searching Program.java
Index Equals Value 🔴 Searching Program.java
Bubble Sort 🟢 Sorting Program.java
Insertion Sort 🟢 Sorting Program.java
Selection Sort 🟢 Sorting Program.java
Three Number Sort 🔵 Sorting Program.java
Quick Sort 🔴 Sorting Program.java
Heap Sort 🔴 Sorting Program.java
Radix Sort 🔴 Sorting Program.java
Merge Sort ⚫ Sorting Program.java
Minimum Waiting Time 🟢 Greedy Algorithms Program.java
Class Photos 🟢 Greedy Algorithms Program.java
Tandem Bicycle 🟢 Greedy Algorithms Program.java
Task Assignment 🔵 Greedy Algorithms Program.java
Valid Starting City 🔵 Greedy Algorithms Program.java
Min Heap Construction 🔵 Heaps Program.java
Continuous Median 🔴 Heaps Program.java
Sort K-Sorted Array 🔴 Heaps Program.java
Laptop Rentals 🔴 Heaps Program.java
Merge Sorted Arrays ⚫ Heaps Program.java
Kadane's Algorithm 🔵 Famous Algorithms Program.java
Dijkstra's Algorithm 🔴 Famous Algorithms Program.java
Topological Sort 🔴 Famous Algorithms Program.java
Knuth Morris Pratt Algorithm ⚫ Famous Algorithms Program.java
A* Algorithm ⚫ Famous Algorithms Program.java
Nth Fibonacci 🟢 Recursion Program.java
Product Sum 🟢 Recursion Program.java
Permutations 🔵 Recursion Program.java
Powerset 🔵 Recursion Program.java
Phone Number Mnemonics 🔵 Recursion Program.java
Staircase Traversal 🔵 Recursion Program.java
Lowest Common Manager 🔴 Recursion Program.java
Interweaving Strings 🔴 Recursion Program.java
Solve Sudoku 🔴 Recursion Program.java
Ambiguous Measurements 🔴 Recursion Program.java
Generate Div Tags 🔴 Recursion Program.java
Number Of Binary Tree Topologies ⚫ Recursion Program.java
Non Attacking Queens ⚫ Recursion Program.java
Find Closest Value In BST 🟢 Binary Search Trees Program.java
BST Traversal 🔵 Binary Search Trees Program.java
BST Construction 🔵 Binary Search Trees Program.java
Validate BST 🔵 Binary Search Trees Program.java
Min Height BST 🔵 Binary Search Trees Program.java
Find Kth Largest Value In BST 🔵 Binary Search Trees Program.java
Reconstruct BST 🔵 Binary Search Trees Program.java
Validate Three Nodes 🔴 Binary Search Trees Program.java
Same BSTs 🔴 Binary Search Trees Program.java
Right Smaller Than ⚫ Binary Search Trees Program.java
Branch Sums 🟢 Binary Trees Program.java
Node Depths 🟢 Binary Trees Program.java
Invert Binary Tree 🔵 Binary Trees Program.java
Binary Tree Diameter 🔵 Binary Trees Program.java
Find Successor 🔵 Binary Trees Program.java
Height Balanced Binary Tree 🔵 Binary Trees Program.java
Max Path Sum In Binary Tree 🔴 Binary Trees Program.java
Find Nodes Distance K 🔴 Binary Trees Program.java
Iterative In-Order Traversal ⚫ Binary Trees Program.java
Flatten Binary Tree ⚫ Binary Trees Program.java
Right Sibling Tree ⚫ Binary Trees Program.java
All Kinds of Node Depths ⚫ Binary Trees Program.java
Compare Leaf Traversal ⚫ Binary Trees Program.java
Max Subset Sum No Adjacent 🔵 Dynamic Programming Program.java
Number Of Ways To Make Change 🔵 Dynamic Programming Program.java
Min Number Of Coins For Change 🔵 Dynamic Programming Program.java
Levenshtein Distance 🔵 Dynamic Programming Program.java
Number Of Ways To Traverse Graph 🔵 Dynamic Programming Program.java
Max Sum Increasing Subsequence 🔴 Dynamic Programming Program.java
Longest Common Subsequence 🔴 Dynamic Programming Program.java
Min Number of Jumps 🔴 Dynamic Programming Program.java
Water Area 🔴 Dynamic Programming Program.java
Knapsack Problem 🔴 Dynamic Programming Program.java
Disk Stacking 🔴 Dynamic Programming Program.java
Numbers In Pi 🔴 Dynamic Programming Program.java
Maximum Sum Submatrix 🔴 Dynamic Programming Program.java
Maximize Expression 🔴 Dynamic Programming Program.java
Max Profit With K Transactions ⚫ Dynamic Programming Program.java
Palindrome Partitioning Min Cuts ⚫ Dynamic Programming Program.java
Longest Increasing Subsequence ⚫ Dynamic Programming Program.java
Longest String Chain ⚫ Dynamic Programming Program.java
Square Of Zeroes ⚫ Dynamic Programming Program.java
Depth-First Search 🟢 Graphs Program.java
Single Cycle Check 🔵 Graphs Program.java
Breadth-First Search 🔵 Graphs Program.java
River Sizes 🔵 Graphs Program.java
Youngest Common Ancestor 🔵 Graphs Program.java
Remove Islands 🔵 Graphs Program.java
Cycle In Graph 🔵 Graphs Program.java
Minimum Passes Of Matrix 🔵 Graphs Program.java
Boggle Board 🔴 Graphs Program.java
Rectangle Mania ⚫ Graphs Program.java
Airport Connections ⚫ Graphs Program.java
Detect Arbitrage ⚫ Graphs Program.java
Two-Edge Connected Graph ⚫ Graphs Program.java
Suffix Trie Construction 🔵 Tries Program.java
Multi String Search 🔴 Tries Program.java

Please Note

Last Updated: 14.06.2021 0103 hours IST.