| 1. | Totally Normal – Determine if Two Strings Are Close – 1657 | 9 | |
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| 2. | Balls Fall Up – Where Will the Ball Fall – Leetcode 1706 | 5 | |
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| 3. | Goodbye | 3 | |
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| 4. | Dit dah dit dit dah – Unique Morse Code Words – Leetcode 804 | 3 | |
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| 5. | SHOT THROUGH THE HEART – Minimum Number of Arrows to Burst Balloons – Leetcode 452 | 3 | |
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| 6. | Noice. – Maximum 69 Number – Leetcode 1323 | 2 | |
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| 7. | Yuck! – Ugly Number – Leetcode 263 | 2 | |
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| 8. | This MEDIUM stumped me! – Perfect Squares – Leetcode 279 | 2 | |
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| 9. | Déjà Vu – Remove Duplicates from Sorted Array – Leetcode 26 | 2 | |
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| 10. | Funny sliding windows – Leetcode 729 – My Calendar I | 2 | |
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| 11. | r1c1 – Valid Sudoku – Leetcode 36 | 2 | |
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| 12. | 100 SUBS! – Odd Even Linked List –Leetcode 328 | 1 | |
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| 13. | Counting mirrors – Longest Palindrome by Concatenating Two Letter Words – Leetcode 2131 | 1 | |
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| 14. | A star solution – Shortest Path in a Grid with Obstacles Elimination – Leetcode 1293 | 1 | |
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| 15. | Only a little googling! – Minimum Window Substring – Leetcode 76 | 1 | |
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| 16. | Bit twiddling shenanigans! – Power of Four – Leetcode 342 | 1 | |
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| 17. | INTERNET, MY BELOVED – Non-decreasing Subsequences – Leetcode 491 | 1 | |
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| 18. | Boustrophedonning – Snakes and Ladders – Leetcode 909 | 0 | |
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| 19. | Easy Sneazy – Count Odd Numbers in an Interval Range – Leetcode 1523 | 0 | |
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| 20. | Special cases... – Word Search – Leetcode 79 | 0 | |
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| 21. | Counting counts – Unique Number of Occurrences – Leetcode 1207 | 0 | |
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| 22. | Absolute madness – Minimum Average Difference – Leetcode 2256 | 0 | |
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| 23. | Is this actually medium? – Peeking Iterator – Leetcode 284 | 0 | |
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| 24. | Thinking Recursively – Same Tree – Leetcode 100 | 0 | |
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| 25. | Indexing madness! – Zigzag Conversion – Leetcode 6 | 0 | |
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| 26. | Adding carefully! – Set Mismatch – Leetcode 645 | 0 | |
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| 27. | What a BEAST – Sum of Subarray Minimums – Leetcode 907 | 0 | |
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| 28. | Stack Pointers – Remove All Adjacent Duplicates In String – Leetcode 1047 | 0 | |
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| 29. | MinMaxing FTW – Maximum Difference Between Node and Ancestor – Leetcode 1026 | 0 | |
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| 30. | Stacks of Triangles! – Largest Perimeter Triangle – Leetcode 976 | 0 | |
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| 31. | Euclid-ish...? – Greatest Common Divisor of Strings – Leetcode 1071 | 0 | |
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| 32. | Beware the flood... – Number of Islands – Leetcode 200 | 0 | |
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| 33. | Too many combinations! – Reordered Power of 2 – Leetcode 869 | 0 | |
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| 34. | Smart Indices – Toeplitz Matrix – Leetcode 766 | 0 | |
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| 35. | Let's go chunk-hunting... – Shortest Unsorted Continuous Subarray – Leetcode 581 | 0 | |
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| 36. | Speedy Turtles – Delete the Middle Node of a Linked List – Leetcode 2095 | 0 | |
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| 37. | Judgey McJudgerson – Find the Town Judge – Leetcode 997 | 0 | |
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| 38. | Futzing with pointers – Kth Smallest Element in a BST – Leetcode 230 | 0 | |
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| 39. | One-handed puzzling – Validate Binary Search Tree – Leetcode 98 | 0 | |
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| 40. | Pan-language Pangrams – Check if the Sentence Is Pangram – Leetcode 1832 | 0 | |
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| 41. | BONUS – Solved! – Valid Sudoku – Leetcode 36 | 0 | |
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| 42. | A bit of clever counting... – Leetcode 62 – Unique paths | 0 | |
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| 43. | I'm Back! – Detect Capital – Leetcodee 520 | 0 | |
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| 44. | SemiQuickSelectSort – Top K Frequent Words – Leetcode 692 | 0 | |
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| 45. | Going AROUND AND AROUND – Spiral Matrix II – Leetcode 59 | 0 | |
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| 46. | Uniquely indexed! – First Unique Character in a String – Leetcode 387 | 0 | |
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| 47. | Good Vs Evil! – Count the Good Nodes in Binary Tree – Leetcode 1448 | 0 | |
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| 48. | Stringy Pancakes – Make The String Great – Leetcode 1544 | 0 | |
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| 49. | Speak up! – Count and Say – Leetcode 38 | 0 | |
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| 50. | False start! – Average of Levels in Binary Tree – Leetcode 637 | 0 | |
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| 51. | Racing Rabbit – Middle of the Linked List – Leetcode 876 | 0 | |
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| 52. | Yet Another Graph Search – Minimum Time to Collect All Apples in a Tree – Leetcode 1443 | 0 | |
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| 53. | Gotta go fast – Design HashMap – Leetcode 706 | 0 | |
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| 54. | Complexity Progression – Contains Duplicate II – Leetcode 219 | 0 | |
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| 55. | Gettin' sneaky with the stack – Palindrome Linked List – Leetcode 234 | 0 | |
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| 56. | Merge then discard!? – Leetcode 378 – Kth smallest element in a sorted matrix | 0 | |
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| 57. | Scanning and swapping... – Reverse Vowels of a String – Leetcode 345 | 0 | |
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| 58. | Mixing methods! – Range Sum of BST – Leetcode 938 | 0 | |
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| 59. | Gettin' Mathsy – Minimum Rounds to Complete All Tasks – Leetcode 2244 | 0 | |
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| 60. | APL hacking – Increasing Triplet Subsequence – Leetcode 334 | 0 | |
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| 61. | Short and Sweet – Sort Characters By Frequency – Leetcode 451 | 0 | |
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| 62. | It's basically inverting a dict, right? – Find Duplicate File in System – Leetcode 609 | 0 | |
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| 63. | Fire the Canon! – Group Anagrams – Leetcode 49 | 0 | |
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| 64. | First try!? – Nearest Exist from Entrance in Maze – Leetcode 1926 | 0 | |
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| 65. | Colouring in time! – Is Graph Bipartite? – Leetcode 785 | 0 | |
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| 66. | Polish Parsing – Basic Calculator – Leetcode 224 | 0 | |
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| 67. | Quick Maths – Power of Three – Leetcode 326 | 0 | |
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| 68. | Dynamically going up – Longest Increasing Subsequence – Leetcode 300 | 0 | |
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| 69. | Push-up trees? – Add One Row to Tree – Leetcode 623 | 0 | |
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| 70. | Snip, snip! – Trim a Binary Search Tree – Leetcode 669 | 0 | |
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| 71. | Asterix Mathematix– Integer to Roman – Leetcode 12 | 0 | |
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| 72. | Roman backstroke! – Roman to Integer – Leetcode 13 | 0 | |
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| 73. | Pointing in all the wrong directions – Recover Binary Search Tree – Leetcode 99 | 0 | |
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| 74. | BONUS: Using actually O(1) space! – Palindrome Linked List – Leetcode 234 | 0 | |
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| 75. | Sneaky A's – Break a Palindrome – Leetcode 1328 | 0 | |
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| 76. | GOLF IT – Reverse Words in a String III – Leetcode 557 | 0 | | Golf It!
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| 77. | All about that trace – Lowest Common Ancestor of a Binary Search Tree – Leetcode 235 | 0 | |
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| 78. | Stacking Branches – Binary Tree Preorder Traversal – Leetcode 144 | 0 | |
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| 79. | Skips and Jumps – Online Stock Span – Leetcode 901 | 0 | |
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| 80. | Tri-way Tribonacci – N-th Tribonacci Number – Leetcode 1137 | 0 | |
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| 81. | Up and Down – Sum of Even Numbers After Queries – Leetcode 985 | 0 | |
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| 82. | Mutating Graphs! – Minimum Genetic Mutation – Leetcode 433 | 0 | |
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| 83. | This sliding window was hard! – Continuous Subarray Sum – Leetcode 523 | 0 | |
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| 84. | Interval... Trees...? – My Calendar III – Leetcode 732 | 0 | |
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| 85. | Funky Tree Climbing – Longest Path With Different Adjacent Characters – Leetcode 2246 | 0 | |
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| 86. | I Scream for... – Maximum Ice Cream Bars – Leetcode 1833 | 0 | |
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| 87. | No trees at all! – Binary Trees with Factors – Leetcode 823 | 0 | |
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| 88. | A proto-quicksort? – Sort Array By Parity – Leetcode 905 | 0 | |
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| 89. | Spinning rings! – Rotate Image – Leetcode 48 | 0 | |
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| 90. | Setting stones – Most Stones Removed with Same Row or Column – Leetocde 947 | 0 | |
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| 91. | The Dynamic String – Maximum Length of a Concatenated String with Unique Characters – Leetcode 1239 | 0 | |
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| 92. | Balancing Act – Determine if String Halves Are Alike – Leetcode 1704 | 0 | |
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| 93. | Party Popper – Minimum Time to Make Rope Colorful – Leetcode 1578 | 0 | |
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| 94. | A jump to the left! – N-ary Tree Level Order Traversal – Leetcode 429 | 0 | |
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| 95. | Catcatcatcat... – Concatenated Words – Leetcode 472 | 0 | |
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| 96. | Pure. Instinct. – Binary Tree Pruning – Leetcode 814 | 0 | |
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| 97. | Probably correct... – Insert Delete GetRandom O(1) – Leetcode 380 | 0 | |
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| 98. | Don't be cheeky now – Encode and Decode TinyURL – Leetcode 535 | 0 | |
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| 99. | Lazy Leaf Crunching – Leaf-Similar Trees – Leetcode 872 | 0 | |
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| 100. | I HATE this question! – Delete Node in a Linked List – Leetcode 237 | 0 | |
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