121 | Best Time to Buy and Sell Stock | Easy |
122 | Best Time to Buy and Sell Stock II | Easy |
125 | Valid Palindrome | Easy |
136 | Single Number | Easy |
141 | Linked List Cycle | Easy |
155 | Min Stack | Easy |
160 | Intersection of Two Linked Lists | Easy |
167 | Two Sum II - Input array is sorted | Easy |
168 | Excel Sheet Column Title | Easy |
169 | Majority Element | Easy |
171 | Excel Sheet Column Number | Easy |
172 | Factorial Trailing Zeroes | Easy |
175 | Combine Two Tables | Easy |
176 | Second Highest Salary | Easy |
181 | Employees Earning More Than Their Managers | Easy |
182 | Duplicate Emails | Easy |
183 | Customers Who Never Order | Easy |
191 | Number of 1 Bits | Easy |
196 | Delete Duplicate Emails | Easy |
198 | House Robber | Easy |
202 | Happy Number | Easy |
205 | Isomorphic Strings | Easy |
206 | Reverse Linked List | Easy |
219 | Contains Duplicate II | Easy |
226 | Invert Binary Tree | Easy |
228 | Summary Ranges | Easy |
231 | Power of Two | Easy |
232 | Implement Queue using Stacks | Easy |
234 | Palindrome Linked List | Easy |
242 | Valid Anagram | Easy |