Coding Exercises

Algorithms

Problem	Solution	Difficulty
Coin Change	Python	Medium
Decode Ways	Python	Medium
House Robber	Python	Medium
Longest Common Subsequence	Python	Medium
Unique Paths	Python	Medium
Alien Dictionary	Python	Hard
Encode and Decode Strings	Python	Medium
Longest Consecutive Sequence	Python	Medium
Valid Sudoku	Python	Medium
Combination Sum	Python	Medium
N Queens	Python	Hard
Word Search	Python	Medium
Find Minimum in Rotated Sorted Array	Python	Medium
Median of 2 Sorted Arrays	Python	Hard
Serialize and Deserialize Binary Tree	Python	Hard
Number of 1 Bits	Python	Easy
Reverse Bits	Python	Easy
Sum of Two Integers	Python	Medium
Clone Graph	Python	Medium
Course Schedule	Python	Medium
Max Area of Island	Python	Medium
Jump Game	Python	Medium
Maximum Subarray	Python	Medium
Find Median from Data Stream	Python	Hard
K Closest Points to Origin	Python	Medium
Kth Largest Element in an Array	Python	Medium
Meeting Rooms II	Python	Medium
Merge Intervals	Python	Medium
Non-Overlapping Intervals	Python	Medium
LRU Cache	Python	Medium
Merge K Sorted Linked Lists	Python	Hard
Reverse Nodes in k-Group	Python	Hard
Rotate Image	Python	Medium
Set Matrix Zeroes	Python	Medium
Spiral Matrix	Python	Medium
Longest Repeating Character Replacement	Python	Medium
Minimum Window Substring	Python	Hard
Sliding Window Maximum	Python	Hard
Basic Calculator	Python	Hard
Daily Temperatures	Python	Medium
Largest Rectangle in Histogram	Python	Hard
Binary Tree Maximum Path Sum	Python	Medium
Construct Binary Tree from Preorder and Inorder Traversal	Python	Medium
Lowest Common Ancestor of a Binary Search Tree	Python	Medium
Design Add and Search Words Data Structure	Python	Medium
Implement Trie (Prefix Tree)	Python	Medium
Word Search II	Python	Hard
Container With Most Water	Python	Medium
Trapping Rain Water	Python	Hard
Two Sum II - Input Array Is Sorted	Python	Medium
Design Twitter	Python	Medium
Rotten Oranges	Python	Medium
Palindrome Number	Python	Easy
Redundant Connection	Python	Medium
Word Ladder	Python	Hard
Partition Equal Subset Sum	Python	Medium
Reverse Integer	Python	Medium
Minimum Interval to Include Each Query	Python	Hard
Binary Search Tree to Greater Sum Tree	Python	Medium
Minimum Absolute Difference	Python	Easy
4 Sum	Python	Medium
Find Synonyms	Python	Medium
Roman to Integer	Python	Easy

Databases

Problem	Solution	Difficulty
Average Selling Price	PostgreSQL	Easy
Exchange Seats	PostgreSQL	Medium
Product Sales Analysis III	PostgreSQL	Medium
Recyclable and Low Fat Products	PostgreSQL	Easy
Rising Temperature	PostgreSQL	Easy
Second Highest Salary	PostgreSQL	Medium
Triangle Judgement	PostgreSQL	Medium