---
tags: programming, leetcode
---

# Selected Problems from LeetCode

This page is used to list the [LeetCode](https://leetcode.com/) problems on which I suggest you could do coding exercise.

## Basic Skill: Arrays & Loops
This section contains the problems which can be done by <font color = "Red">simply using loops and arrays</font>.

* [1. Two Sum](https://leetcode.com/problems/two-sum/)
* [15. 3Sum](https://leetcode.com/problems/3sum/)
* [26. Remove Duplicates from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array/)
* [27. Remove Element](https://leetcode.com/problems/remove-element/)
* [35. Search Insert Position](https://leetcode.com/problems/search-insert-position/)
* [121. Best Time to Buy and Sell Stock](https://leetcode.com/problems/best-time-to-buy-and-sell-stock/)
* [122. Best Time to Buy and Sell Stock II](https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/)
* [167. Two Sum II - Input array is sorted](https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/)
* [169. Majority Element](https://leetcode.com/problems/majority-element/)
* [217. Contains Duplicate](https://leetcode.com/problems/contains-duplicate/)
* [268. Missing Number](https://leetcode.com/problems/missing-number/)
* [278. First Bad Version](https://leetcode.com/problems/first-bad-version/)
* [645. Set Mismatch](https://leetcode.com/problems/set-mismatch/)
* [1089. Duplicate Zeros](https://leetcode.com/problems/duplicate-zeros/)

## Data Structures
### Linked List
* [Floyd's algorithm in Circular Linked List](https://hackmd.io/@sysprog/c-linked-list?type=view#circular-linked-list)
### Binary Tree
* [100. Same Tree](https://leetcode.com/problems/same-tree/)
* [101. Symmetric Tree](https://leetcode.com/problems/symmetric-tree/)
* [104. Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/)
* [144. Binary Tree Preorder Traversal](https://leetcode.com/problems/binary-tree-preorder-traversal/)
* [965. Univalued Binary Tree](https://leetcode.com/problems/univalued-binary-tree/)
### Binary Search Tree (BST)
### Graph

## Algorithms
### Recursion
* [50. Pow(x, n)](https://leetcode.com/problems/powx-n/)
### Two-Pointer
### Divide & Conquer (DC)
### Dynamic Programming (DP)
### Backtracking