LeetCode LeetCode problems that I have solved. Python 1. Two Sum 112. Path Sum 118. Pascal's Triangle 121. Best Time to Buy and Sell Stock 122. Best Time to Buy and Sell Stock 2 136. Single Number 137. Single Number 2 202. Happy Number 217. Contains Duplicate 231. Power of Two 242. Valid Anagram 387. First Unique Character in a String MySQL 176. Second Highest Salary 183. Customers Who Never Order 196. Delete Duplicate Email 197. Rising Temperature