This is a project to record my code of algorithm questions in LintCode. The basic plan is to write down 2 or 3 questions every day. If you are also interested to challenge the algorithm questions, welcome to follow me in LintCode. Meanwhile, you can apply to join the question group getting stronger 💪 with other mates in the group.
The algorithm problem is a key part in job interview for programmers 💻, to improve the ability of interview and pass it successfully, and it is necessary to study and practice algorithm questions usually. This project includes algorithm questions I have written down the level from naive to hard. If you are interested in algorithm problems, you could star 🌟 and watch 👀 this repository, which will be continuously updated.
| Index | Day | Question Title |
Level |
|---|---|---|---|
| 1 | 2020.08.07 | 366.Fibonacci | Naive |
| 2 | 2020.08.07 | 454.Rectangle Area | Naive |
| 3 | 2020.08.07 | 463.Sort Integers | Naive |
| 4 | 2020.08.12 | 466.Count Linked List Nodes | Naive |
| 5 | 2020.08.12 | 632.Binary Tree Maximum Nodes | Naive |
| 6 | 2020.08.12 | 8.Rotate String | Easy |
| 7 | 2020.08.13 | 22.Flatten List | Easy |
| 8 | 2020.08.13 | 28.Search A 2D Matrix | Easy |
| 9 | 2020.08.13 | 39.Recover Rotated Sorted Array | Easy |
| 10 | 2020.08.14 | 53.Reverse Words In a String | Easy |
| 11 | 2020.08.14 | 55.Compare Strings | Easy |
| 12 | 2020.08.14 | 60.Search Insert Position | Easy |
| 13 | 2020.08.16 | 128.Hash Function | Easy |
| 14 | 2020.08.16 | 141.Sqrt(x) | Easy |
| 15 | 2020.08.18 | 155.Minimum Depth Of Binary Tree | Easy |
| 16 | 2020.08.18 | 156.Merge Intervals | Easy |
| 17 | 2020.08.23 | 167.Add Two Numbers | Easy |
| 18 | 2020.08.23 | 174.Remove Nth Node From End of List | Easy |
| 19 | 2020.08.25 | 188.Inset Five | Easy |
| 20 | 2020.08.25 | 209.First Unique Character in a String | Easy |
| 21 | 2020.08.25 | 212.Space Replacement | Easy |
| 22 | 2020.08.29 | 468.Symmetric Binary Elements | Easy |
| 23 | 2020.08.29 | 296.Unique Array | Easy |
| 24 | 2020.08.29 | 56.TwoSum | Easy |
| 25 | 2020.08.30 | 260.Same Diagonal Elements | Easy |
| 26 | 2020.08.30 | 2.Trailing Zeros | Easy |
| 27 | 2020.08.30 | 78.Linked List Weighted Sum In Reverse Order | Easy |
| 28 | 2020.08.31 | 524.Left Pad | Easy |
| 29 | 2020.08.31 | 764.Calculate Circumference And Area | Easy |
| 30 | 2020.08.31 | 765.Valid Triangle | Easy |
| 31 | 2020.09.02 | 766.Leap Year | Easy |
| 32 | 2020.09.02 | 767.Reverse Array | Easy |
| 33 | 2020.09.02 | 771.Double Factorial | Easy |
| 34 | 2020.09.03 | 813.Find Anagram Mappings | Easy |
| 35 | 2020.09.03 | 835.Hamming Distance | Easy |
| 36 | 2020.09.03 | 845.Greatest Common Divisor | Easy |
| 37 | 2020.09.08 | 888.Valid Word Square | Easy |
| 38 | 2020.09.08 | 914.Flip Game | Easy |
| 39 | 2020.09.08 | 916.Palindrome Permutation | Easy |
| 40 | 2020.09.12 | 952.Digital Problem | Easy |
| 41 | 2020.09.12 | 977.Base7 | Easy |
| 42 | 2020.09.12 | 987.Binary Number with Alternating Bits | Easy |
| 43 | 2020.09.16 | 993.Array Partition I | Easy |
| 44 | 2020.09.16 | 1005.Largest Triangle Area | Easy |
| 45 | 2020.09.16 | 1011.Number of Lines To Write String | Easy |
| 46 | 2020.09.17 | 1013.Unique Morse Code Words | Easy |
| 47 | 2020.09.17 | 1028.Rotated Digits | Easy |
| 48 | 2020.09.17 | 1038.Jewels And Stones | Easy |
| 49 | 2020.09.22 | 1042.Toeplitz Matrix | Easy |
| 50 | 2020.09.22 | 1046.Prime Number of Set Bits in Binary Representation | Easy |
| 51 | 2020.09.22 | 1054.MinCost Climbing Stairs | Easy |
| 52 | 2020.09.29 | 1056.Find Smallest Letter Greater Than Target | Easy |
| 53 | 2020.09.29 | 1062.Flood Fill | Easy |
| 54 | 2020.09.29 | 1078.Degree of an Array | Easy |
| 55 | 2020.10.08 | 1094.Second Minimum Node In a Binary Tree | Easy |
| 56 | 2020.10.08 | 1104.Judge Route Circle | Easy |
| 57 | 2020.10.08 | 1119.Maximum Product of Three Numbers | Easy |
| 58 | 2020.10.11 | 1126.Merge Two Binary Trees | Easy |
| 59 | 2020.10.11 | 1137.Construct String from Binary Tree | Easy |
| 60 | 2020.10.21 | 1138.Can Place Flowers | Easy |
| 61 | 2020.10.21 | 1143.Minimum Index Sum of Two Lists | Easy |
| 62 | 2020.10.21 | 1144.Range Addition II | Easy |
| 63 | 2020.10.22 | 1148.Longest Harmonious Subsequence | Easy |
| 64 | 2020.10.22 | 1163.Distribute Candies | Easy |
| 65 | 2020.10.25 | 1165.Subtree of Another Tree | Easy |
| 66 | 2020.10.25 | 1172.Binary Tree Tilt | Easy |
| 67 | 2020.10.25 | 1173.Reverse Words in a String III | Easy |
| 68 | 2020.10.29 | 1178.Student Attendance Record I | Easy |
| 69 | 2020.10.29 | 1181.Diameter of Binary Tree | Easy |
| 70 | 2020.11.05 | 1188.Minimum Absolute Difference in BST | Easy |
| 71 | 2020.11.05 | 1193.Detect Capital | Easy |
| 72 | 2020.11.05 | 1199.Perfect Number | Easy |
| 73 | 2020.11.06 | 1200.Relative Ranks | Easy |
| 74 | 2020.11.06 | 1204.Keyboard Row | Easy |
| 75 | 2020.11.06 | 1206.Next Greater Element I | Easy |
| 76 | 2020.11.17 | 1209.Construct the Rectangle | Easy |
| 77 | 2020.11.17 | 1214.License Key Formatting | Easy |
| 78 | 2020.11.19 | 1218.Number Complement | Easy |
| 79 | 2020.11.19 | 1225.Island Perimeter | Easy |
| 80 | 2020.11.19 | 1227.Repeated Substring Pattern | Easy |
| 81 | 2020.11.22 | 1228.Poor Pigs | Easy |
| 82 | 2020.11.22 | 1231.Minimum Moves to Equal Array Elements | Easy |
| 83 | 2020.11.22 | 1236.Find All Numbers Disappeared in an Array | Easy |
| 84 | 2020.11.30 | 1254.Sum of Left Leaves | Easy |
| 85 | 2020.11.30 | 1266.Find the Difference | Easy |
| 86 | 2020.11.30 | 1270.Ransom Note | Easy |
| 87 | 2020.12.01 | 1285.Power of Four | Easy |
| 88 | 2020.12.01 | 1294.Power of Three | Easy |
| 89 | 2020.12.01 | 1314.Power of Two | Easy |
| 90 | 2020.12.12 | 1320.Contains Duplicate | Easy |
| 91 | 2020.12.12 | 1332.Number of 1 Bits | Easy |
| 92 | 2020.12.12 | 1347.Factorial Trailing Zeroes | Easy |
| 93 | 2020.12.18 | 1348.Excel Sheet Column Number | Easy |
| 94 | 2020.12.18 | 1360.Symmetric Tree | Easy |
| 95 | 2020.12.18 | 1385.Lucky Number Eight | Easy |
| 96 | 2020.12.24 | 1394.Goat Latin | Easy |
| 97 | 2020.12.24 | 1459.Judge the Last Number | Easy |
| 98 | 2020.12.27 | 1471.Set Operation | Easy |
| 99 | 2020.12.27 | 1480.Dot Product | Easy |
| 100 | 2020.12.27 | 1546.Coin Problem | Easy |
| 101 | 2020.12.28 | 1564.Interval Search | Easy |
| 102 | 2020.12.28 | 1585.Moving Stones | Easy |
| 103 | 2020.12.30 | 1615.The Result of Investment | Easy |
| 104 | 2020.12.30 | 1617.Array Maximum Difference | Easy |
| 105 | 2021.01.04 | 23.Is Alphanumeric | Naive |
| 106 | 2021.01.04 | 228.Middle of Linked List | Naive |
| 107 | 2021.01.04 | 297.Find the Maximum | Naive |
| 108 | 2021.01.05 | 298.Find Prime | Naive |
| 109 | 2021.01.05 | 1910.Most Numbers | Naive |
| 110 | 2021.01.07 | 37.Reverse 3-digit Integer | Naive |
| 111 | 2021.01.07 | 145.Lowercase to Uppercase | Naive |
| 112 | 2021.01.07 | 484.Swap Two Integers in Array | Naive |
| 113 | 2021.01.10 | 9.Fizz Buzz | Easy |
| 114 | 2021.01.10 | 133.Longest Word | Easy |
| 115 | 2021.01.10 | 372.Delete Node in a Linked List | Easy |
| 116 | 2021.01.11 | 97.Maximum Depth of Binary Tree | Easy |
| 117 | 2021.01.11 | 82.Single Number | Easy |
| 118 | 2021.01.11 | 175.Invert Binary Tree | Easy |
| 119 | 2021.01.13 | 375.Clone Binary Tree | Easy |
| 120 | 2021.01.13 | 157.Unique Characters | Easy |
| 121 | 2021.01.13 | 14.First Position of Target | Easy |
| 122 | 2021.01.14 | 445.Cosine Similarity | Easy |
| 123 | 2021.01.14 | 181.Flip Bits | Easy |
| 124 | 2021.01.16 | 488.Happy Number | Easy |
| 125 | 2021.01.16 | 469.Same Tree | Easy |
| 126 | 2021.01.16 | 46.Majority Element | Easy |
| 127 | 2021.01.19 | 64.Merge Sorted Array | Easy |
| 128 | 2021.01.19 | 66.Binary Tree Preorder Traversal | Easy |
| 129 | 2021.01.19 | 67.Binary Tree Inorder Traversal | Easy |
| 130 | 2021.01.20 | 68.Binary Tree Postorder Traversal | Easy |
| 131 | 2021.01.20 | 365.Count 1 in Binary | Easy |
| 132 | 2021.01.22 | 539.Move Zeroes | Easy |
| 133 | 2021.01.22 | 491.Palindrome Number | Easy |
| 134 | 2021.01.22 | 569.Add Digits | Easy |
| 135 | 2021.01.26 | 422.Length of Last Word | Easy |
| 136 | 2021.01.26 | 517.Ugly Number | Easy |
| 137 | 2021.01.28 | 6.Merge Two Sorted Arrays | Easy |
| 138 | 2021.01.28 | 13.Implement strStr() | Easy |
| 139 | 2021.01.28 | 50.Product of Array Exclude Itself | Easy |
| 140 | 2021.01.31 | 80.Median | Easy |
| 141 | 2021.01.31 | 138.Subarray Sum | Easy |
| 142 | 2021.01.31 | 451.Swap Nodes in Pairs | Easy |
| 143 | 2021.02.01 | 1.A+B Problem | Easy |
| 144 | 2021.02.01 | 69.Binary Tree Level Order Traversal | Easy |
| 145 | 2021.02.03 | 177.Convert Sorted Array to Binary Search Tree With Minimal Height | Easy |
| 146 | 2021.02.03 | 158.Valid Anagram | Easy |
| 147 | 2021.02.03 | 165.Merge Two Sorted Lists | Easy |
| 148 | 2021.02.05 | 777.Valid Perfect Square | Easy |
| 149 | 2021.02.05 | 111.Climbing Stairs | Easy |
| 150 | 2021.02.05 | 173.Insertion Sort List | Easy |
| 151 | 2021.02.06 | 112.Remove Duplicates from Sorted List | Easy |
| 152 | 2021.02.06 | 93.Balanced Binary Tree | Easy |
| 153 | 2021.02.07 | 749.John's backyard garden | Easy |
| 154 | 2021.02.07 | 457.Classical Binary Search | Easy |
| 155 | 2021.02.07 | 452.Remove Linked List Elements | Easy |
| 156 | 2021.02.08 | 35.Reverse Linked List | Easy |
| 157 | 2021.02.08 | 41.Maximum Subarray | Easy |
| 158 | 2021.02.09 | 142.O(1) Check Power of 2 | Easy |
| 159 | 2021.02.09 | 96.Partition List | Easy |
| 160 | 2021.02.10 | 646.First Position Unique Character | Easy |
| 161 | 2021.02.10 | 166.Nth to Last Node in List | Easy |
| 162 | 2021.02.18 | 373.Partition Array by Odd and Even | Easy |
| 163 | 2021.02.18 | 85.Insert Node in a Binary Search Tree | Easy |
| 164 | 2021.02.18 | 100.Remove Duplicates from Sorted Array | Easy |
| 165 | 2021.02.19 | 101.Remove Duplicates from Sorted Array II | Easy |
| 166 | 2021.02.19 | 661.Convert BST to Greater Tree | Easy |
| 167 | 2021.02.19 | 172.Remove Element | Easy |
| 168 | 2021.02.23 | 1033.Minimum Difference Between BST Nodes | Easy |
| 169 | 2021.02.23 | 1360.Symmetric Tree | Medium |
| 170 | 2021.02.25 | 283.Max of 3 Numbers | Naive |
| 171 | 2021.02.25 | 484.Swap Two Integers in Array | Naive |
| 172 | 2021.02.25 | 1910.Most Numbers | Naive |
| 173 | 2021.02.27 | 1913.Query Student Enrollment Information | Naive |
| 174 | 2021.02.27 | 1919.Members Whose Scores Exceed the Group leader | Naive |
| 175 | 2021.02.27 | 1921.Players Who Never Recharge | Naive |
| 176 | 2021.02.28 | 1930.Public Rental Housing Information Query | Naive |
| 177 | 2021.02.28 | 1931.Find Specific Patient | Naive |
| 178 | 2021.02.28 | 1934.Zhang San's Story I | Naive |
| 179 | 2021.03.01 | 1938.Query User Email | Naive |
| 180 | 2021.03.01 | 1945.Club Annual Competition Score Ranking I | Naive |
| 181 | 2021.03.01 | 25.Print X | Naive |
| 182 | 2021.03.02 | 838.Subarray Sum Equals K | Easy |
| 183 | 2021.04.21 | 1901.Squares of a Sorted Array | Easy |
| 184 | 2021.04.21 | 1503.Give Change | Easy |
@ Martin Yan
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