| 1. | Goodbye | 58 | |
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| 2. | Easy Sneazy – Count Odd Numbers in an Interval Range – Leetcode 1523 | 23 | |
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| 3. | Short and sweet! – Shuffle the Array – Leetcode 1470 | 22 | |
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| 4. | Indexing madness! – Zigzag Conversion – Leetcode 6 | 24 | |
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| 5. | The Hitchhikers Guide to Spelling – Verifying an Alien Dictionary – Leetcode 953 | 13 | |
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| 6. | Euclid-ish...? – Greatest Common Divisor of Strings – Leetcode 1071 | 13 | |
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| 7. | Tri-way Tribonacci – N-th Tribonacci Number – Leetcode 1137 | 270 | |
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| 8. | Catcatcatcat... – Concatenated Words – Leetcode 472 | 22 | |
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| 9. | Hop-stopping – Cheapest Flights Within K Stops – Leetcode 787 | 34 | |
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| 10. | I'm SO confused... – Find Closest Node to Given Two Nodes – Leetcode 2359 | 53 | |
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| 11. | Boustrophedonning – Snakes and Ladders – Leetcode 909 | 101 | |
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| 12. | Judgey McJudgerson – Find the Town Judge – Leetcode 997 | 22 | |
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| 13. | INTERNET, MY BELOVED – Non-decreasing Subsequences – Leetcode 491 | 22 | |
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| 14. | Overlapper! – Insert Interval – Leetcode 57 | 51 | |
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| 15. | Funky Tree Climbing – Longest Path With Different Adjacent Characters – Leetcode 2246 | 22 | |
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| 16. | Yet Another Graph Search – Minimum Time to Collect All Apples in a Tree – Leetcode 1443 | 16 | |
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| 17. | Thinking Recursively – Same Tree – Leetcode 100 | 69 | |
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| 18. | Stacking Branches – Binary Tree Preorder Traversal – Leetcode 144 | 15 | |
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| 19. | I Scream for... – Maximum Ice Cream Bars – Leetcode 1833 | 10 | |
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| 20. | SHOT THROUGH THE HEART – Minimum Number of Arrows to Burst Balloons – Leetcode 452 | 36 | |
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| 21. | Gettin' Mathsy – Minimum Rounds to Complete All Tasks – Leetcode 2244 | 20 | |
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| 22. | Transpositionality! – Delete Columns to Make Sorted – Leetcode 944 | 43 | |
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| 23. | I'm Back! – Detect Capital – Leetcodee 520 | 32 | |
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| 24. | I made that look difficult... – Counting Bits – Leetcode 338 | 14 | |
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| 25. | Maybe INCORRECT? – Longest Consecutive Sequence – Leetcode 128 | 6 | |
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| 26. | Sneaky Evens... – Longest Palindromic Substring – Leetcode 5 | 8 | |
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| 27. | Absolute madness – Minimum Average Difference – Leetcode 2256 | 7 | |
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| 28. | Short and Sweet – Sort Characters By Frequency – Leetcode 451 | 8 | |
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| 29. | Polish Parsing – Basic Calculator – Leetcode 224 | 3 | |
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| 30. | A star solution – Shortest Path in a Grid with Obstacles Elimination – Leetcode 1293 | 17 | |
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| 31. | Adding carefully! – Set Mismatch – Leetcode 645 | 10 | |
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| 32. | Only a little googling! – Minimum Window Substring – Leetcode 76 | 22 | |
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| 33. | MinMaxing FTW – Maximum Difference Between Node and Ancestor – Leetcode 1026 | 28 | |
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| 34. | Lazy Leaf Crunching – Leaf-Similar Trees – Leetcode 872 | 32 | |
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| 35. | Mixing methods! – Range Sum of BST – Leetcode 938 | 24 | |
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| 36. | 100 SUBS! – Odd Even Linked List –Leetcode 328 | 87 | |
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| 37. | Racing Rabbit – Middle of the Linked List – Leetcode 876 | 33 | |
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| 38. | Totally Normal – Determine if Two Strings Are Close – 1657 | 206 | |
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| 39. | Balancing Act – Determine if String Halves Are Alike – Leetcode 1704 | 226 | |
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| 40. | Counting counts – Unique Number of Occurrences – Leetcode 1207 | 177 | |
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| 41. | Probably correct... – Insert Delete GetRandom O(1) – Leetcode 380 | 273 | |
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| 42. | Easy Win – Find Players With Zero or One Losses – Leetcode 2225 | 413 | |
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| 43. | What a BEAST – Sum of Subarray Minimums – Leetcode 907 | 470 | |
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| 44. | Special cases... – Word Search – Leetcode 79 | 297 | |
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| 45. | BONUS – Solved! – Valid Sudoku – Leetcode 36 | 56 | |
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| 46. | r1c1 – Valid Sudoku – Leetcode 36 | 767 | |
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| 47. | This MEDIUM stumped me! – Perfect Squares – Leetcode 279 | 316 | |
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| 48. | First try!? – Nearest Exist from Entrance in Maze – Leetcode 1926 | 112 | |
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| 49. | Yuck! – Ugly Number – Leetcode 263 | 481 | |
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| 50. | Sneaky Sorts! – Rectangle Area – Leetcode 223 | 331 | |
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| 51. | Galloping challenge – Guess Number Higher or Lower – Leetcode 374 | 106 | |
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| 52. | Binary searching a tree?! – Count Complete Tree Nodes – Leetcode 222 | 65 | |
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| 53. | Setting stones – Most Stones Removed with Same Row or Column – Leetocde 947 | 101 | |
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| 54. | Déjà Vu – Remove Duplicates from Sorted Array – Leetcode 26 | 38 | |
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| 55. | Stack Pointers – Remove All Adjacent Duplicates In String – Leetcode 1047 | 84 | |
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| 56. | Skips and Jumps – Online Stock Span – Leetcode 901 | 31 | |
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| 57. | Stringy Pancakes – Make The String Great – Leetcode 1544 | 94 | |
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| 58. | Noice. – Maximum 69 Number – Leetcode 1323 | 146 | |
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| 59. | Feature-length coding session! – Word Search II – Leetcode 212 | 58 | |
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| 60. | Scanning and swapping... – Reverse Vowels of a String – Leetcode 345 | 30 | |
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| 61. | Counting mirrors – Longest Palindrome by Concatenating Two Letter Words – Leetcode 2131 | 79 | |
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| 62. | Mutating Graphs! – Minimum Genetic Mutation – Leetcode 433 | 66 | |
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| 63. | Balls Fall Up – Where Will the Ball Fall – Leetcode 1706 | 813 | |
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| 64. | Smart Indices – Toeplitz Matrix – Leetcode 766 | 29 | |
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| 65. | Fire the Canon! – Group Anagrams – Leetcode 49 | 17 | |
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| 66. | It's not what I thought! – Image Overlap – Leetcode 835 | 21 | |
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| 67. | This sliding window was hard! – Continuous Subarray Sum – Leetcode 523 | 154 | |
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| 68. | Python makes it TOO easy! – Check If Two String Arrays are Equivalent – Leetcode 1662 | 57 | |
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| 69. | The Dynamic String – Maximum Length of a Concatenated String with Unique Characters – Leetcode 1239 | 35 | |
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| 70. | Complexity Progression – Contains Duplicate II – Leetcode 219 | 7 | |
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| 71. | Asterix Mathematix– Integer to Roman – Leetcode 12 | 14 | |
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| 72. | SemiQuickSelectSort – Top K Frequent Words – Leetcode 692 | 12 | |
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| 73. | Speak up! – Count and Say – Leetcode 38 | 13 | |
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| 74. | Pan-language Pangrams – Check if the Sentence Is Pangram – Leetcode 1832 | 11 | |
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| 75. | Speedy Turtles – Delete the Middle Node of a Linked List – Leetcode 2095 | 16 | |
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| 76. | I HATE this question! – Delete Node in a Linked List – Leetcode 237 | 16 | |
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| 77. | Stacks of Triangles! – Largest Perimeter Triangle – Leetcode 976 | 14 | |
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| 78. | APL hacking – Increasing Triplet Subsequence – Leetcode 334 | 12 | |
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| 79. | Sneaky A's – Break a Palindrome – Leetcode 1328 | 8 | |
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| 80. | Interval... Trees...? – My Calendar III – Leetcode 732 | 48 | |
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| 81. | I guess I can't be that lazy... – Time Based Key-Value Store – Leetcode 981 | 9 | |
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| 82. | Push-up trees? – Add One Row to Tree – Leetcode 623 | 6 | |
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| 83. | Recursively recursing – Path Sum – Leetcode 112 | 18 | |
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| 84. | Party Popper – Minimum Time to Make Rope Colorful – Leetcode 1578 | 7 | |
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| 85. | It's always too slow... – Concatenation of Consecutive Binary Numbers – Leetcode 1680 | 5 | |
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| 86. | GOLF IT – Reverse Words in a String III – Leetcode 557 | 8 | | Golf It!
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| 87. | Up and Down – Sum of Even Numbers After Queries – Leetcode 985 | 9 | |
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| 88. | Matrix madness! – Maximum Length of Repeated Subarray – Leetcode 718 | 6 | |
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| 89. | It's basically inverting a dict, right? – Find Duplicate File in System – Leetcode 609 | 2 | |
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| 90. | No, it's not LISP – Construct String from Binary Tree – Leetcode 606 | 13 | |
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| 91. | Pure. Instinct. – Binary Tree Pruning – Leetcode 814 | 6 | |
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| 92. | A jump to the left! – N-ary Tree Level Order Traversal – Leetcode 429 | 6 | |
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| 93. | False start! – Average of Levels in Binary Tree – Leetcode 637 | 11 | |
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| 94. | Good Vs Evil! – Count the Good Nodes in Binary Tree – Leetcode 1448 | 2 | |
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| 95. | Just go with the flow... – Pacific Atlantic Water Flow – Leetcode 417 | 9 | |
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| 96. | Spinning rings! – Rotate Image – Leetcode 48 | 8 | |
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| 97. | Beware the flood... – Number of Islands – Leetcode 200 | 7 | |
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| 98. | Too many combinations! – Reordered Power of 2 – Leetcode 869 | 3 | |
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| 99. | Quick Maths – Power of Three – Leetcode 326 | 4 | |
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| 100. | BONUS: Using actually O(1) space! – Palindrome Linked List – Leetcode 234 | 36 | |
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