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One of the great things about Leetcode is that it offers a range of problems to solve, from simple to complex. This means that there is something for everyone, regardless of their skill level. Leetcode also provides solutions to problems so that participants can learn from their mistakes.
Explore is a well-organized tool that helps you get the most out of LeetCode by providing structure to guide your progress towards the next step in your programming career.
All Leetcode Solutions
| # | Problem Title | Difficulty | Solution |
|---|---|---|---|
| 1 | Two Sum | Easy | Link |
| 2 | Add Two Numbers | Medium | Link |
| 3 | Longest Substring Without Repeating Characters | Medium | Link |
| 4 | Median of Two Sorted Arrays | Hard | Link |
| 5 | Longest Palindromic Substring | Medium | Link |
| 6 | ZigZag Conversion | Medium | Link |
| 7 | Reverse Integer | Easy | Link |
| 8 | String to Integer (atoi) | Medium | Link |
| 9 | Palindrome Number | Easy | Link |
| 10 | Regular Expression Matching | Hard | Link |
| 11 | Container With Most Water | Medium | Link |
| 12 | Integer to Roman | Medium | Link |
| 13 | Roman to Integer | Easy | Link |
| 14 | Longest Common Prefix | Easy | Link |
| 15 | 3Sum | Medium | Link |
| 16 | 3Sum Closest | Medium | Link |
| 17 | Letter Combinations of a Phone Number | Medium | Link |
| 18 | 4Sum | Medium | Link |
| 19 | Remove Nth Node From End of List | Medium | Link |
| 20 | Valid Parentheses | Easy | Link |
| 21 | Merge Two Sorted Lists | Easy | Link |
| 22 | Generate Parentheses | Medium | Link |
| 23 | Merge k Sorted Lists | Hard | Link |
| 24 | Swap Nodes in Pairs | Medium | Link |
| 25 | Reverse Nodes in k-Group | Hard | Link |
| 26 | Remove Duplicates from Sorted Array | Easy | Link |
| 27 | Remove Element | Easy | Link |
| 28 | Find the Index of the First Occurrence in a String | Easy | Link |
| 29 | Divide Two Integers | Medium | Link |
| 30 | Substring with Concatenation of All Words | Hard | Link |
| 31 | Next Permutation | Medium | Link |
| 32 | Longest Valid Parentheses | Hard | Link |
| 33 | Search in Rotated Sorted Array | Medium | Link |
| 34 | Find First and Last Position of Element in Sorted Array | Medium | Link |
| 35 | Search Insert Position | Easy | Link |
| 36 | Valid Sudoku | Medium | Link |
| 37 | Sudoku Solver | Hard | Link |
| 38 | Count and Say | Easy | Link |
| 39 | Combination Sum | Medium | Link |
| 40 | Combination Sum II | Medium | Link |
| 41 | First Missing Positive | Hard | Link |
| 42 | Trapping Rain Water | Hard | Link |
| 43 | Multiply Strings | Medium | Link |
| 44 | Wildcard Matching | Hard | Link |
| 45 | Jump Game II | Hard | Link |
| 46 | Permutations | Medium | Link |
| 47 | Permutations II | Medium | Link |
| 48 | Rotate Image | Medium | Link |
| 49 | Group Anagrams | Medium | Link |
| 50 | Pow(x, n) | Medium | Link |
| 51 | N-Queens | Hard | Link |
| 52 | N-Queens II | Hard | Link |
| 53 | Maximum Subarray | Easy | Link |
| 54 | Spiral Matrix | Medium | Link |
| 55 | Jump Game | Medium | Link |
| 56 | Merge Intervals | Medium | Link |
| 57 | Insert Interval | Hard | Link |
| 58 | Length of Last Word | Easy | Link |
| 59 | Spiral Matrix II | Medium | Link |
| 60 | Permutation Sequence | Medium | Link |
| 61 | Rotate List | Medium | Link |
| 62 | Unique Paths | Medium | Link |
| 63 | Unique Paths II | Medium | Link |
| 64 | Minimum Path Sum | Medium | Link |
| 65 | Valid Number | Hard | Link |
| 66 | Plus One | Easy | Link |
| 67 | Add Binary | Easy | Link |
| 68 | Text Justification | Hard | Link |
| 69 | Sqrt(x) | Easy | Link |
| 70 | Climbing Stairs | Easy | Link |
| 71 | Simplify Path | Medium | Link |
| 72 | Edit Distance | Hard | Link |
| 73 | Set Matrix Zeroes | Medium | Link |
| 74 | Search a 2D Matrix | Medium | Link |
| 75 | Sort Colors | Medium | Link |
| 76 | Minimum Window Substring | Hard | Link |
| 77 | Combinations | Medium | Link |
| 78 | Subsets | Medium | Link |
| 79 | Word Search | Medium | Link |
| 80 | Remove Duplicates from Sorted Array II | Medium | Link |
| 81 | Search in Rotated Sorted Array II | Medium | Link |
| 82 | Remove Duplicates from Sorted List II | Medium | Link |
| 83 | Remove Duplicates from Sorted List | Easy | Link |
| 84 | Largest Rectangle in Histogram | Hard | Link |
| 85 | Maximal Rectangle | Hard | Link |
| 86 | Partition List | Medium | Link |
| 87 | Scramble String | Hard | Link |
| 88 | Merge Sorted Array | Easy | Link |
| 89 | Gray Code | Medium | Link |
| 90 | Subsets II | Medium | Link |
| 91 | Decode Ways | Medium | Link |
| 92 | Reverse Linked List II | Medium | Link |
| 93 | Restore IP Addresses | Medium | Link |
| 94 | Binary Tree Inorder Traversal | Medium | Link |
| 95 | Unique Binary Search Trees II | Medium | Link |
| 96 | Unique Binary Search Trees | Medium | Link |
| 97 | Interleaving String | Hard | Link |
| 98 | Validate Binary Search Tree | Medium | Link |
| 99 | Recover Binary Search Tree | Hard | Link |
| 100 | Same Tree | Easy | Link |
| 101 | Symmetric Tree | Easy | Link |
| 102 | Binary Tree Level Order Traversal | Medium | Link |
| 103 | Binary Tree Zigzag Level Order Traversal | Medium | Link |
| 104 | Maximum Depth of Binary Tree | Easy | Link |
| 105 | Construct Binary Tree from Preorder and Inorder Traversal | Medium | Link |
| 106 | Construct Binary Tree from Inorder and Postorder Traversal | Medium | Link |
| 107 | Binary Tree Level Order Traversal II | Easy | Link |
| 108 | Convert Sorted Array to Binary Search Tree | Easy | Link |
| 109 | Convert Sorted List to Binary Search Tree | Medium | Link |
| 110 | Balanced Binary Tree | Easy | Link |
| 111 | Minimum Depth of Binary Tree | Easy | Link |
| 112 | Path Sum | Easy | Link |
| 113 | Path Sum II | Medium | Link |
| 114 | Flatten Binary Tree to Linked List | Medium | Link |
| 115 | Distinct Subsequences | Hard | Link |
| 116 | Populating Next Right Pointers in Each Node | Medium | Link |
| 117 | Populating Next Right Pointers in Each Node II | Medium | Link |
| 118 | Pascal’s Triangle | Easy | Link |
| 119 | Pascal’s Triangle II | Easy | Link |
| 120 | Triangle | Medium | Link |
| 121 | Best Time to Buy and Sell Stock | Easy | Link |
| 122 | Best Time to Buy and Sell Stock II | Easy | Link |
| 123 | Best Time to Buy and Sell Stock III | Hard | Link |
| 124 | Binary Tree Maximum Path Sum | Hard | Link |
| 125 | Valid Palindrome | Easy | Link |
| 126 | Word Ladder II | Hard | Link |
| 127 | Word Ladder | Medium | Link |
| 128 | Longest Consecutive Sequence | Hard | Link |
| 129 | Sum Root to Leaf Numbers | Medium | Link |
| 130 | Surrounded Regions | Medium | Link |
| 131 | Palindrome Partitioning | Medium | Link |
| 132 | Palindrome Partitioning II | Hard | Link |
| 133 | Clone Graph | Medium | Link |
| 134 | Gas Station | Medium | Link |
| 135 | Candy | Hard | Link |
| 136 | Single Number | Easy | Link |
| 137 | Single Number II | Medium | Link |
| 138 | Copy List with Random Pointer | Medium | Link |
| 139 | Word Break | Medium | Link |
| 140 | Word Break II | Hard | Link |
| 141 | Linked List Cycle | Easy | Link |
| 142 | Linked List Cycle II | Medium | Link |
| 143 | Reorder List | Medium | Link |
| 144 | Binary Tree Preorder Traversal | Medium | Link |
| 145 | Binary Tree Postorder Traversal | Hard | Link |
| 146 | LRU Cache | Hard | Link |
| 147 | Insertion Sort List | Medium | Link |
| 148 | Sort List | Medium | Link |
| 149 | Max Points on a Line | Hard | Link |
| 150 | Evaluate Reverse Polish Notation | Medium | Link |
Disclaimer: The above Problems are generated by Leetcode but the solution is provided by Chase2learn.This tutorial is only for Educational and Learning purpose.
Finally, we are now, in the end, I just want to conclude some important message for you
Note:-Â I compile all programs, if there is any case program is not working and showing an error please let me know in the comment section. If you are using adblocker, please disable adblocker because some functions of the site may not work correctly.
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FAQ:-
1. Is LeetCode the best way to prepare for interviews?
LeetCode-type questions are part of almost every programming interview or you can say every company interview, so every software developer should practice them before an interview. Their only option is to prepare smartly so yes we can say LeetCode is the best way to prepare for interviews.
2. leetcode vs hackerrank
I believe HackerRank questions are basics like it is for hackathons or code challenges but LeetCode questions are closer to technical interviews.
3. How to become 5 star coder in Leetcode?
Solve more problems and your star rank will grow as a direct result. The star ranking on your profile only depends on the number of problems on LeetCode that you have solved. Solve as many questions as you can. Read More
4. How much does Leetcode cost in India?
Annual Subscription $159.00. You must use an India-based payment method to qualify for a discount against COVID-19.
5. How to Get Discount on Leetcode premium?Â
You can use an India-based payment method to qualify for a discount against COVID-19.
6. Is Leetcode good for SQL practice?
LeetCode is a good platform for practicing SQL Queries. The SQL Questions on LeetCode are framed pretty similar to how they are asked in SQL Interviews hence solving SQL questions on LeetCode can give you a good hands on experience on solving real world SQL questions.
7. How do I improve my Leetcode skills?
- 5 Tips To Beat the LeetCode Grind. Get ready for coding interviews the right way! …
- Stick to Learning a Single Topic Each Week. …
- Stick to a Schedule and Be Consistent. …
- Focus Only on Your Weakest Topics. …
- Give Yourself a Time Limit When Solving Problems. …
- Find a Study Buddy. Read more
 8. What is the cost of Leetcode premium?
$35/month
LeetCode Premium is LeetCode’s paid subscription, which currently costs $35/month or $159/year. It gives users access to premium problems and solutions, a built-in debugger, and interview simulations.
9. Which is best Leet code or Codechef?Â
LeetCode seems to be a lot more popular than Codechef.
10. How to get a job at Leetcode?
you can check here Leetcode openings and apply: https://apply.workable.com/leetcode/
11. Is Leetcode contest difficult?
Nope, it’s up to you if you know how to solve then it is easy if you don’t know then it would be difficult for you so it depends from person to person.
12. Does Leetcode make you a better programmer?
yes, Leetcode makes you a better programmer, Solving LeetCode problems definitely helps you improve your coding and problem-solving skills.
13. How do I get an answer in Leetcode?
So simple on the website Chase2learn you will get all Leetcode problem solutions.Â
14. What is good rating at Leetcode?
If you can reach 2200+ in leetcode, you’re already in the top 2% of players!
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