| 1. | Balls Fall Up – Where Will the Ball Fall – Leetcode 1706 | 12 | |
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| 2. | Yuck! – Ugly Number – Leetcode 263 | 10 | |
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| 3. | Tri-way Tribonacci – N-th Tribonacci Number – Leetcode 1137 | 10 | |
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| 4. | Sneaky Sorts! – Rectangle Area – Leetcode 223 | 8 | |
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| 5. | Goodbye | 6 | |
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| 6. | Probably correct... – Insert Delete GetRandom O(1) – Leetcode 380 | 5 | |
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| 7. | Thinking Recursively – Same Tree – Leetcode 100 | 5 | |
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| 8. | r1c1 – Valid Sudoku – Leetcode 36 | 5 | |
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| 9. | What a BEAST – Sum of Subarray Minimums – Leetcode 907 | 4 | |
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| 10. | Totally Normal – Determine if Two Strings Are Close – 1657 | 3 | |
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| 11. | Speedy Turtles – Delete the Middle Node of a Linked List – Leetcode 2095 | 3 | |
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| 12. | Noice. – Maximum 69 Number – Leetcode 1323 | 3 | |
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| 13. | This sliding window was hard! – Continuous Subarray Sum – Leetcode 523 | 3 | |
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| 14. | Counting mirrors – Longest Palindrome by Concatenating Two Letter Words – Leetcode 2131 | 3 | |
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| 15. | 100 SUBS! – Odd Even Linked List –Leetcode 328 | 3 | |
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| 16. | Stringy Pancakes – Make The String Great – Leetcode 1544 | 3 | |
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| 17. | Fire the Canon! – Group Anagrams – Leetcode 49 | 2 | |
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| 18. | Boustrophedonning – Snakes and Ladders – Leetcode 909 | 3 | |
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| 19. | We create LIFE! - Game of Life - Leetcode 289 | 2 | |
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| 20. | A star solution – Shortest Path in a Grid with Obstacles Elimination – Leetcode 1293 | 2 | |
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| 21. | Spinning rings! – Rotate Image – Leetcode 48 | 2 | |
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| 22. | Only a little googling! – Minimum Window Substring – Leetcode 76 | 2 | |
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| 23. | The Dynamic String – Maximum Length of a Concatenated String with Unique Characters – Leetcode 1239 | 2 | |
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| 24. | To recurse, or not to recurse... – Search in a Binary Search Tree – Leetcode 700 | 1 | |
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| 25. | Gettin' Mathsy – Minimum Rounds to Complete All Tasks – Leetcode 2244 | 1 | |
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| 26. | SHOT THROUGH THE HEART – Minimum Number of Arrows to Burst Balloons – Leetcode 452 | 1 | |
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| 27. | Mutating Graphs! – Minimum Genetic Mutation – Leetcode 433 | 1 | |
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| 28. | Déjà Vu – Remove Duplicates from Sorted Array – Leetcode 26 | 1 | |
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| 29. | One-handed puzzling – Validate Binary Search Tree – Leetcode 98 | 1 | |
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| 30. | Scanning and swapping... – Reverse Vowels of a String – Leetcode 345 | 1 | |
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| 31. | First try!? – Nearest Exist from Entrance in Maze – Leetcode 1926 | 1 | |
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| 32. | False start! – Average of Levels in Binary Tree – Leetcode 637 | 1 | |
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| 33. | No trees at all! – Binary Trees with Factors – Leetcode 823 | 1 | |
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| 34. | Just go with the flow... – Pacific Atlantic Water Flow – Leetcode 417 | 1 | |
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| 35. | Quick Maths – Power of Three – Leetcode 326 | 1 | |
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| 36. | BONUS: Using actually O(1) space! – Palindrome Linked List – Leetcode 234 | 1 | |
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| 37. | Merge then discard!? – Leetcode 378 – Kth smallest element in a sorted matrix | 1 | |
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| 38. | Counting counts – Unique Number of Occurrences – Leetcode 1207 | 1 | |
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| 39. | Hop-stopping – Cheapest Flights Within K Stops – Leetcode 787 | 1 | |
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| 40. | Bit twiddling shenanigans! – Power of Four – Leetcode 342 | 1 | |
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| 41. | Stacks of Triangles! – Largest Perimeter Triangle – Leetcode 976 | 1 | |
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| 42. | Balancing Act – Determine if String Halves Are Alike – Leetcode 1704 | 1 | |
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| 43. | Interval... Trees...? – My Calendar III – Leetcode 732 | 1 | |
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| 44. | Funny sliding windows – Leetcode 729 – My Calendar I | 1 | |
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| 45. | Adding carefully! – Set Mismatch – Leetcode 645 | 1 | |
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| 46. | Special cases... – Word Search – Leetcode 79 | 1 | |
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| 47. | Easy Win – Find Players With Zero or One Losses – Leetcode 2225 | 1 | |
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| 48. | The OTHER big end – Reduce Array Size to The Half – Leetcode 1338 | 1 | |
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| 49. | Roman backstroke! – Roman to Integer – Leetcode 13 | 1 | |
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| 50. | Judgey McJudgerson – Find the Town Judge – Leetcode 997 | 1 | |
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| 51. | INTERNET, MY BELOVED – Non-decreasing Subsequences – Leetcode 491 | 1 | |
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| 52. | This MEDIUM stumped me! – Perfect Squares – Leetcode 279 | 1 | |
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| 53. | Dit dah dit dit dah – Unique Morse Code Words – Leetcode 804 | 1 | |
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| 54. | Transpositionality! – Delete Columns to Make Sorted – Leetcode 944 | 1 | |
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| 55. | I'm Back! – Detect Capital – Leetcodee 520 | 1 | |
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| 56. | Uniquely indexed! – First Unique Character in a String – Leetcode 387 | 1 | |
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| 57. | Gettin' sneaky with the stack – Palindrome Linked List – Leetcode 234 | 1 | |
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| 58. | A jump to the left! – N-ary Tree Level Order Traversal – Leetcode 429 | 0 | |
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| 59. | A bit of clever counting... – Leetcode 62 – Unique paths | 0 | |
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| 60. | Lazy Leaf Crunching – Leaf-Similar Trees – Leetcode 872 | 0 | |
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| 61. | SemiQuickSelectSort – Top K Frequent Words – Leetcode 692 | 0 | |
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| 62. | Absolute madness – Minimum Average Difference – Leetcode 2256 | 0 | |
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| 63. | Easy Sneazy – Count Odd Numbers in an Interval Range – Leetcode 1523 | 0 | |
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| 64. | Party Popper – Minimum Time to Make Rope Colorful – Leetcode 1578 | 0 | |
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| 65. | Is this actually medium? – Peeking Iterator – Leetcode 284 | 0 | |
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| 66. | Recursively recursing – Path Sum – Leetcode 112 | 0 | |
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| 67. | Funky Tree Climbing – Longest Path With Different Adjacent Characters – Leetcode 2246 | 0 | |
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| 68. | Stack Pointers – Remove All Adjacent Duplicates In String – Leetcode 1047 | 0 | |
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| 69. | Indexing madness! – Zigzag Conversion – Leetcode 6 | 0 | |
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| 70. | Maybe INCORRECT? – Longest Consecutive Sequence – Leetcode 128 | 0 | |
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| 71. | Don't be cheeky now – Encode and Decode TinyURL – Leetcode 535 | 0 | |
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| 72. | No, it's not LISP – Construct String from Binary Tree – Leetcode 606 | 0 | |
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| 73. | Setting stones – Most Stones Removed with Same Row or Column – Leetocde 947 | 0 | |
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| 74. | Smart Indices – Toeplitz Matrix – Leetcode 766 | 0 | |
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| 75. | Euclid-ish...? – Greatest Common Divisor of Strings – Leetcode 1071 | 0 | |
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| 76. | It's always too slow... – Concatenation of Consecutive Binary Numbers – Leetcode 1680 | 0 | |
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| 77. | Left or right!? – Convert BST to Greater Tree – Leetcode 538 | 0 | |
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| 78. | I Scream for... – Maximum Ice Cream Bars – Leetcode 1833 | 0 | |
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| 79. | Pan-language Pangrams – Check if the Sentence Is Pangram – Leetcode 1832 | 0 | |
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| 80. | Speak up! – Count and Say – Leetcode 38 | 0 | |
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| 81. | Overlapper! – Insert Interval – Leetcode 57 | 0 | |
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| 82. | Yet Another Graph Search – Minimum Time to Collect All Apples in a Tree – Leetcode 1443 | 0 | |
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| 83. | Pure. Instinct. – Binary Tree Pruning – Leetcode 814 | 0 | |
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| 84. | Going AROUND AND AROUND – Spiral Matrix II – Leetcode 59 | 0 | |
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| 85. | I'm SO confused... – Find Closest Node to Given Two Nodes – Leetcode 2359 | 0 | |
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| 86. | BONUS – Solved! – Valid Sudoku – Leetcode 36 | 0 | |
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| 87. | Push-up trees? – Add One Row to Tree – Leetcode 623 | 0 | |
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| 88. | All for the want of two lines – Path With Minimum Effort – Leetcode 1631 | 0 | |
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| 89. | Phantom matrices? – Design Underground System – Leetcode 1396 | 0 | |
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| 90. | I made that look difficult... – Counting Bits – Leetcode 338 | 0 | |
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| 91. | Good Vs Evil! – Count the Good Nodes in Binary Tree – Leetcode 1448 | 0 | |
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| 92. | The Hitchhikers Guide to Spelling – Verifying an Alien Dictionary – Leetcode 953 | 0 | |
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| 93. | Confused by iterators! – Binary Search Tree Iterator – Leetcode 173 | 0 | |
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| 94. | Binary searching a tree?! – Count Complete Tree Nodes – Leetcode 222 | 0 | |
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| 95. | It's not what I thought! – Image Overlap – Leetcode 835 | 0 | |
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| 96. | Gotta go fast – Design HashMap – Leetcode 706 | 0 | |
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| 97. | Galloping challenge – Guess Number Higher or Lower – Leetcode 374 | 0 | |
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| 98. | Sneaky A's – Break a Palindrome – Leetcode 1328 | 0 | |
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| 99. | Matrix madness! – Maximum Length of Repeated Subarray – Leetcode 718 | 0 | |
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| 100. | Using the right data structure helps... – Min Cost to Connect All Points – Leetcode 1584 | 0 | |
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