Data Structure and Algorithm Problems

Problem Progress

  Index Problem Statement Difficulty Solved Note Review
        60 60 1
⭐ 1 Two Number Sum 🟩 1 1 1
⭐ 2 Validate Subsequence 🟩 1 1  
⭐ 3 Sorted Square Array 🟩 1 1  
⭐ 4 Tournament Winner 🟩 1 1  
⭐ 5 Non-Constructible Change 🟩 1 1  
⭐ 6 Transpose Matrix 🟩 1 1  
⭐ 7 Find Closest Value in BST 🟩 1 1  
⭐ 8 Branch Sums 🟩 1 1  
⭐ 9 Node Depths 🟩 1 1  
⭐ 10 Evaluate Expression Tree 🟩 1 1  
⭐ 11 Depth First Search 🟩 1 1  
⭐ 12 Minimum Waiting Time 🟩 1 1  
⭐ 13 Class Photos 🟩 1 1  
⭐ 14 Tandem Bicycle 🟩 1 1  
⭐ 15 Optimal Free lancing 🟩 1 1  
⭐ 16 Remove Duplicates from Linked List 🟩 1 1  
⭐ 17 Middle Node 🟩 1 1  
⭐ 18 Nth Fibonacci 🟩 1 1  
⭐ 19 Product Sum 🟩 1 1  
⭐ 20 Binary Search 🟩 1 1  
⭐ 21 Find Three Largest Numbers 🟩 1 1  
⭐ 22 Bubble Sort 🟩 1 1  
⭐ 23 Insertion Sort 🟩 1 1  
⭐ 24 Selection Sort 🟩 1 1  
⭐ 25 Palindrome Check 🟩 1 1  
⭐ 26 Caesar Cipher Encryptor 🟩 1 1  
⭐ 27 Run Length Encoding 🟩 1 1  
⭐ 28 Common Character 🟩 1 1  
⭐ 29 Generate Document 🟩 1 1  
⭐ 30 First Non Repeating Character 🟩 1 1  
⭐ 31 Semordnilap 🟩 1 1  
⭐ 32 Three Number Sum 🟦 1 1  
⭐ 33 Smallest Difference 🟦 1 1  
⭐ 34 Move Element to End 🟦 1 1  
⭐ 35 Monotonic Array 🟦 1 1  
⭐ 36 Spiral Traverse 🟦 1 1  
⭐ 37 Longest Peak 🟦 1 1  
⭐ 38 Array of Products 🟦 1 1  
⭐ 39 First Duplicate Value 🟦 1 1  
⭐ 40 Merge Overlapping Intervals 🟦 1 1  
⭐ 41 Best Seats 🟦 1 1  
⭐ 42 Zero Sum Subarray 🟦 1 1  
⭐ 43 Missing Numbers 🟦 1 1  
⭐ 44 Majority Element 🟦 1 1  
⭐ 45 Sweet And Savory 🟦 1 1  
⭐ 46 BST Construction 🟦 1 1  
⭐ 47 Validate BST 🟦 1 1  
⭐ 48 BST Traversal 🟦 1 1  
⭐ 49 Min Height BST 🟦 1 1  
⭐ 50 Find Kth Largest Value In BST 🟦 1 1  
⭐ 51 Reconstruct BST 🟦 1 1  
⭐ 52 Invert Binary Tree 🟦 1 1  
⭐ 53 Binary Tree Diameter 🟦 1 1  
⭐ 54 Find Successor 🟦 1 1  
⭐ 55 Height Balanced Binary Tree 🟦 1 1  
⭐ 56 Merge Binary Trees 🟦 1 1  
⭐ 57 Symmetrical Tree 🟦 1 1  
⭐ 58 Split Binary Tree 🟦 1 1  
⭐ 59 Max Subset Sum No Adjacent 🟦 1 1  
⭐ 60 Number of Ways to Make Change 🟦 1 1  
⭐ 61 Min Number of Coins for Change 🟦      
⭐ 62 Levenshtein Distance 🟦      
⭐ 63 Number of Ways To Traverse Graph 🟦      
⭐ 64 Kadane’s Algorithm 🟦      
⭐ 65 Stable Internships 🟦      
⭐ 66 Union Find 🟦      
⭐ 67 Single Cycle Check 🟦      
⭐ 68 Breadth First Search 🟦      
⭐ 69 River Sizes 🟦      
⭐ 70 Youngest Common Ancestor 🟦      
⭐ 71 Remove Islands 🟦      
⭐ 72 Cycle In Graph 🟦      
⭐ 73 Minimum Passes of Matrix 🟦      
⭐ 74 Two-Colorable 🟦      
⭐ 75 Task Assignment 🟦      
⭐ 76 Valid Starting City 🟦      
⭐ 77 Min Heap Construction 🟦      
⭐ 78 Linked List Construction 🟦      
⭐ 79 Remove Kth Node From End 🟦      
⭐ 80 Sum of Linked Lists 🟦      
⭐ 81 Merging Linked Lists 🟦      
⭐ 82 Permutations 🟦      
⭐ 83 Powerset 🟦      
⭐ 84 Phone Number Mnemonics 🟦      
⭐ 85 Staircase Traversal 🟦      
⭐ 86 Blackjack Probability 🟦      
⭐ 87 Reveal Minesweeper 🟦      
⭐ 88 Search in Sorted matrix 🟦      
⭐ 89 Three Number Sort 🟦      
⭐ 90 Min Max Stack construction 🟦      
⭐ 91 Balanced Brackets 🟦      
⭐ 92 Sunset Views 🟦      
⭐ 93 Best Digits 🟦      
⭐ 94 Sort Stack 🟦      
⭐ 95 Next Greater Element 🟦      
⭐ 96 Reverse Polish Notation 🟦      
⭐ 97 Colliding Asteroids 🟦      
⭐ 98 Longest Panlindromic Substring 🟦      
⭐ 99 Group Anagrams 🟦      
⭐ 100 Valid IP Addresses 🟦      
⭐ 101 Reverse Words In String 🟦      
⭐ 102 Minimum Characters For Words 🟦      
⭐ 103 One Edit 🟦      
⭐ 104 Suffix Trie Construction 🟦      
⭐ 105 Four Number Sum 🟥      
⭐ 106 Subarray Sort 🟥      
⭐ 107 Largest Range 🟥      
⭐ 108 Min Rewards 🟥      
⭐ 109 Zigzag Traverse 🟥      
  110 Longest Subarray With Sum 🟥      
  111 Knight Connection 🟥      
  112 Count Squares 🟥      
⭐ 113 Same bsts 🟥      
⭐ 114 Validate Three Nodes 🟥      
  115 Repair BST 🟥      
  116 Sum BSTs 🟥      
⭐ 117 Max Path Sum In Binary Tree 🟥      
⭐ 118 Find Nodes Distance K 🟥      
  119 Max Sum Increasing Subsequence 🟥      
⭐ 120 Longest Common Subsequence 🟥      
⭐ 121 Min Number of Jumps 🟥      
⭐ 122 Water Area 🟥      
⭐ 123 Knapsack Problem 🟥      
⭐ 124 Disk Stacking 🟥      
⭐ 125 Numbers in Pi 🟥      
⭐ 126 Maximum Sum Submatrix 🟥      
  127 Maximize Expression 🟥      
  128 Dice Throws 🟥      
  129 Juice Bottling 🟥      
⭐ 130 Dijkstra Algorithm 🟥      
⭐ 131 Topological Sort 🟥      
  132 Kruskal’s Algorithm 🟥      
  133 Prim’s Algorithm 🟥      
⭐ 134 Boggle Board 🟥      
  135 Largest Island 🟥      
⭐ 136 Continuous Median 🟥      
⭐ 137 Sort K Sorted Array 🟥      
⭐ 138 Laptop Rentals 🟥      
⭐ 139 Find Loop 🟥      
⭐ 140 Reverse Linked List 🟥      
⭐ 141 Merge Linked Lists 🟥      
⭐ 142 Shift Linked Lists 🟥      
⭐ 143 Lowest Common Manager 🟥      
  144 Interweaving Strings 🟥      
⭐ 145 Solve Sudoku 🟥      
⭐ 146 Generate Div Tags 🟥      
⭐ 147 Ambiguous Measurements 🟥      
⭐ 148 Shifted Binary Search 🟥      
⭐ 149 Search For Range 🟥      
⭐ 150 Quickselect 🟥      
⭐ 151 Index Equals Value 🟥      
⭐ 152 Quick Sort 🟥      
⭐ 153 Heap Sort 🟥      
⭐ 154 Radix Sort 🟥      
⭐ 155 Shorten Path 🟥      
⭐ 156 Largest Rectangle Under Skyline 🟥      
⭐ 157 Longest Substring Without Duplication 🟥      
⭐ 158 Underscorify Substring 🟥      
⭐ 159 Pattern Matcher 🟥      
⭐ 160 Multi String Search 🟥      
  161 Longest Most Frequent Prefix 🟥      
  162 Shortest Unique Prefixes 🟥      
⭐ 163 Apartment Hunting ⬛      
⭐ 164 Calendar Matching ⬛      
⭐ 165 Waterfall Streams ⬛      
⭐ 166 Minimum Area Rectangle ⬛      
⭐ 167 Line Through Points ⬛      
⭐ 168 Right Smaller Than ⬛      
⭐ 169 Iterative Inorder Traversal ⬛      
⭐ 170 Flatten Binary Tree ⬛      
⭐ 171 Right Sibling Tree ⬛      
⭐ 172 All Kinds of Node Depths ⬛      
⭐ 173 Compare Leaf Traversal ⬛      
⭐ 174 Max Profits With K Transactions ⬛      
⭐ 175 Palindrome Partitioning Min Cuts ⬛      
⭐ 176 Longest Increasing Subsequence ⬛      
⭐ 177 Longest String Chain ⬛      
⭐ 178 Square Of Zeroes ⬛      
  179 Knuth-Morris-Pratt Algorithm ⬛      
⭐ 180 A Star Algorithm ⬛      
  181 Rectangle Mania ⬛      
⭐ 182 Detect Arbitrage ⬛      
  183 Two-Edge-Connected Graph ⬛      
⭐ 184 Airport Connections ⬛      
⭐ 185 Merge Sorted Arrays ⬛      
⭐ 186 LRU Cache ⬛      
⭐ 187 Rearrange Linked List ⬛      
⭐ 188 Linked List Palindrome ⬛      
⭐ 189 Zip Linked List ⬛      
⭐ 190 Node Swap ⬛      
⭐ 191 Number of Binary Tree Topologies ⬛      
⭐ 192 Non Attacking Queens ⬛      
  193 Median Of Two Sorted Arrays ⬛      
  194 Optimal Assembly Line ⬛      
⭐ 195 Merge Sort ⬛      
⭐ 196 Count Inversions ⬛      
  197 Largest Park ⬛      
  198 Smallest Substring Containing ⬛      
⭐ 199 Longest Balanced Substring ⬛      
  200 Strings Made Up Of Strings ⬛      

Lecture Progress

  Total 1st round
Array 15  
String 5  
Stack 7  
Hashmap 9  
Dynamic Programming 14  
BackTracking 11  
LinkedList 14  
Queue 6  
Tree 13  
Graph 9  
Heap 7  
Greedy 9  
Math Bit 6  
Sorting 10  

Reference

Notes Mentioning This Note

LeetCode Beginner
Problems in LeetCode Beginner’s Guide

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