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Algorithms (LeetCode, HackerRank, Codility, CTCI - Cracking The Coding Interview & Miscellaneous studies & solutions)

Problem Tags
Binary Search
Binary Tree
Breadth First Search (BFS) (Both BSTs and Graphs)
Depth First Search (DFS) (Both BSTs and Graphs)
Divide and Conquer
Dynamic Programming
Graph
Greedy
Interactive
Linked List
Minimum Spanning Tree - MST
Notes
Shortest Path
Sliding Window
Sorting
Tree
Trie
Common Pitfalls & Notes
Integer.MAX_VALUE and Integer.MIN_VALUE usages

LeetCode

PROBLEM DESCR. SOLUTION DIFFICULTY RELATED TOPICS ADDITIONAL INFO
LeetCode 1. Two Sum 🟢Easy Array, Hash Table Problem Set / Algorithms
LeetCode 3. Longest Substring Without Repeating Characters 🟠Medium Sliding Window, Hash Table, Two Pointers, String Problem Set / Algorithms
LeetCode 35. Search Insert Position 🟢Easy Array, Binary Search Problem Set / Algorithms
LeetCode 53. Maximum Subarray 🟢Easy Array, Divide and Conquer, Dynamic Programming Problem Set / Algorithms
LeetCode 62. Unique Paths 🟠Medium Array, Dynamic Programming Problem Set / Algorithms
LeetCode 64. Minimum Path Sum 🟠Medium Array, Dynamic Programming Problem Set / Algorithms
LeetCode 70. Climbing Stairs 🟢Easy Math, Dynamic Programming, Memoization Problem Set / Algorithms
LeetCode 74. Search a 2D Matrix 🟠Medium Array, Binary Search, Matrix Problem Set / Algorithms
LeetCode 94. Binary Tree Inorder Traversal 🟠Medium Hash Table, Stack, Tree Problem Set / Algorithms
LeetCode 98. Validate Binary Search Tree 🟠Medium Tree, Depth-first Search Problem Set / Algorithms
LeetCode 101. Symmetric Tree 🟢Easy Tree, Depth-first Search, Breadth-first Search Problem Set / Algorithms
LeetCode 102. Binary Tree Level Order Traversal 🟠Medium Tree, Breadth-first Search Problem Set / Algorithms
LeetCode 104. Maximum Depth of Binary Tree 🟢Easy Tree, Depth-first Search Problem Set / Algorithms
LeetCode 107. Binary Tree Level Order Traversal II 🟢Easy Tree, Breadth-first Search Problem Set / Algorithms
LeetCode 111. Minimum Depth of Binary Tree 🟢Easy Tree, Depth-first Search, Breadth-first Search Problem Set / Algorithms
LeetCode 118. Pascal's Triangle 🟢Easy Array, Dynamic Programming Problem Set / Algorithms
LeetCode 121. Best Time to Buy and Sell Stock 🟢Easy Array, Dynamic Programming Problem Set / Algorithms
LeetCode 122. Best Time to Buy and Sell Stock II 🟢Easy Array, Greedy Problem Set / Algorithms
LeetCode 124. Binary Tree Maximum Path Sum 🔴Hard Dynamic Programming, Tree, Depth-first Search, Binary Tree Problem Set / Algorithms
LeetCode 130. Surrounded Regions 🟠Medium Depth-first Search, Breadth-first Search, Union Find Problem Set / Algorithms
LeetCode 139. Word Break 🟠Medium Hash Table, String, Dynamic Programming, Trie, Memoization Problem Set / Algorithms
LeetCode 144. Binary Tree Preorder Traversal 🟠Medium Stack, Tree Problem Set / Algorithms
LeetCode 145. Binary Tree Postorder Traversal 🔴Hard Stack, Tree Problem Set / Algorithms
LeetCode 198. House Robber 🟠Medium Array, Dynamic Programming Problem Set / Algorithms
LeetCode 200. Number of Islands 🟠Medium Depth-first Search, Breadth-first Search, Union Find Problem Set / Algorithms
LeetCode 206. Reverse Linked List 🟢Easy Linked List Problem Set / Algorithms
LeetCode 208. Implement Trie (Prefix Tree) 🟠Medium Hash Taable , String , Design , Trie Problem Set / Algorithms
LeetCode 213. House Robber II 🟠Medium Array, Dynamic Programming Problem Set / Algorithms
LeetCode 230. Kth Smallest Element in a BST 🟠Medium Binary Search, Tree Problem Set / Algorithms
LeetCode 237. Delete Node in a Linked List 🟢Easy Linked List Problem Set / Algorithms
LeetCode 278. First Bad Version 🟢Easy Binary Search, Interactive Problem Set / Algorithms
LeetCode 300. Longest Increasing Subsequence 🟠Medium Array, Binary Search, Dynamic Programming Problem Set / Algorithms
LeetCode 501. Find Mode in Binary Search Tree 🟢Easy Tree Problem Set / Algorithms
LeetCode 509. Fibonacci Number 🟢Easy Math, Dynamic Programming, Recursion, Memoization Problem Set / Algorithms
LeetCode 518. Coin Change II 🟠Medium Array, Dynamic Programming Problem Set / Algorithms
LeetCode 559. Maximum Depth of N-ary Tree 🟢Easy Depth-first Search, Breadth-first Search Problem Set / Algorithms
LeetCode 675. Cut Off Trees for Golf Event 🔴Hard Breadth-first Search Problem Set / Algorithms
LeetCode 700. Search in a Binary Search Tree 🟢Easy Tree Problem Set / Algorithms
LeetCode 701. Insert into a Binary Search Tree 🟠Medium Tree Problem Set / Algorithms
LeetCode 704. Binary Search 🟢Easy Array, Binary Search Problem Set / Algorithms
LeetCode 746. Min Cost Climbing Stairs 🟢Easy Array, Dynamic Programming Problem Set / Algorithms
LeetCode 938. Range Sum of BST 🟢Easy Tree, Recursion Problem Set / Algorithms
LeetCode 957. Prison Cells After N Days 🟠Medium Hash Table Problem Set / Algorithms
LeetCode 997. Find the Town Judge 🟢Easy Graph Problem Set / Algorithms
LeetCode 1137. N-th Tribonacci Number 🟢Easy Math, Dynamic Programming, Memoization Problem Set / Algorithms
LeetCode 1143. Longest Common Subsequence 🟠Medium String, Dynamic Programming Problem Set / Algorithms
LeetCode 1221. Split a String in Balanced Strings 🟢Easy String, Greedy Problem Set / Algorithms
LeetCode 1710. Maximum Units on a Truck 🟢Easy Greedy, Sort Problem Set / Algorithms
LeetCode TreasureIsland Depth-first Search, Breadth-first Search Interview Question / Amazon
LeetCode TreasureIslandCenk Depth-first Search, Breadth-first Search Interview Question / Amazon

Codility

PROBLEM DESCR. SOLUTION DIFFICULTY RELATED TOPICS ADDITIONAL INFO
Codility Binary Gap 🟢Easy Iterations Lessons / 1 - Iterations
Codility Cyclic Rotation 🟢Easy Arrays Lessons / 2 - Arrays
Codility Odd Occurrences In Array 🟢Easy Arrays Lessons / 2 - Arrays
Codility Frog Jump (FrogJmp) 🟢Easy Time Complexity Lessons / 3 - Time Complexity
Codility Permutation Missing Element (PermMissingElem) 🟢Easy Time Complexity Lessons / 3 - Time Complexity
Codility Tape Equilibrium (TapeEquilibrium) 🟢Easy Time Complexity Lessons / 3 - Time Complexity
Codility Brackets 🟢Easy Stacks and Queues Lessons / 7 - Stacks and Queues
Codility Fish 🟢Easy Stacks and Queues Lessons / 7 - Stacks and Queues
Codility Nesting 🟢Easy Stacks and Queues Lessons / 7 - Stacks and Queues

HackerRank

PROBLEM DESCR. SOLUTION DIFFICULTY RELATED TOPICS ADDITIONAL INFO
HackerRank 2D Array - DS 🟢Easy Array Data Structures / Arrays
HackerRank Sales by Match 🟢Easy Array Algorithms / Implementation
HackerRank Minimum Absolute Difference in an Array 🟢Easy Greedy Algorithms / Greedy

CTCI - Cracking The Coding Interview

PROBLEM DESCR. SOLUTION DIFFICULTY RELATED TOPICS ADDITIONAL INFO
CTCI C1Q1 - IsUniqueChars 🟢Easy Arrays and Strings Data Structures / Arrays
CTCI C1Q4 - Anagram 🟢Easy Arrays and Strings Data Structures / Arrays
CTCI C1Q7 - RotateMatrix 🟢Easy Arrays and Strings Data Structures / Arrays
CTCI C1Q8 - ZeroMatrix 🟢Easy Arrays and Strings Data Structures / Arrays
CTCI C2Q1 - RemoveDups 🟢Easy Linked Lists Data Structures / LinkedLists
CTCI C2Q2 - ReturnKthToLast 🟢Easy Linked Lists Data Structures / LinkedLists
CTCI C8Q1 - TripleStep 🟢Easy Dynamic Programming Algorithms / Dynamic Programming

Miscellaneous

PROBLEM DESCR. SOLUTION DIFFICULTY RELATED TOPICS ADDITIONAL INFO
Misc Longest substring length with K distinct characters 🟢Easy Sliding Window Algorithms / Sliding Window
Misc Maximum Sum Of Contiguous SubArray Of Fixed Size K 🟢Easy Sliding Window Algorithms / Sliding Window
Misc Smallest subarray with given sum 🟢Easy Sliding Window Algorithms / Sliding Window
Misc Bubble Sort 🟢Easy Sorting Algorithms / Sorting
Misc Insertion Sort 🟢Easy Sorting Algorithms / Sorting
Misc Merge Sort 🟢Easy Sorting Algorithms / Sorting
Misc Quick Sort 🟢Easy Sorting Algorithms / Sorting
Misc Selection Sort 🟢Easy Sorting Algorithms / Sorting
Misc Sorted Array 🟢Easy Sorting Algorithms / Sorting
Misc Dijkstra's Algorithm 🟢Easy Shortest Path Algorithms / Shortest Path
Misc Prim's Algorithm 🟢Easy Minimum Spanning Tree - MST Algorithms / Minimum Spanning Tree - MST
Misc Binary Tree From Sorted Array 🟢Easy Binary Tree Algorithms / Study
Misc Lru Cache Impl. 🟢Easy Lru Cache Algorithms / Study
Misc Reverse LinkedList 🟢Easy Linked List Algorithms / Study
Misc Biggest Two Digit Value String Fragment 🟢Easy Algorithms / Assessments
Misc Min Num Of Letters Must Be Deleted 🟠Medium Algorithms / Assessments
Misc Chain Divided Into Three Smaller Chains 🟠Medium Algorithms / Assessments
Misc 0/1 Knapsack Problem 🟠Medium Dynamic Programming Problem Set / Algorithms

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