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16 | 16 | | 94 | Binary Tree Inorder Traversal | Given the root of a binary tree, return the inorder traversal of its nodes' values. | [Solution](binary_tree_inorder_traversal.js) | |
17 | 17 | | 104 | Maximum Depth of Binary Tree | Given the root of a binary tree, return its maximum depth. | [Solution](maximum_depth_binary_tree.js) | |
18 | 18 | | 125 | Valid Palindrome | Given a string s, return true if it is a palindrome, or false otherwise. | [Solution](valid_palindrome.js) | |
| 19 | +| 136 | Single Number | Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. | [Solution](single_number.js) | |
19 | 20 | | 141 | Linked List Cycle | Return true if there is a cycle in the linked list. Otherwise, return false. | [Solution](linked_list_cycle.js) | |
20 | 21 | | 169 | Majority Element | Given an array nums of size n, return the majority element. | [Solution](majority_element.js) | |
21 | 22 | | 175 | Combine Two Tables | Report the first name, last name, city, and state of each person in the table. | [Solution](combine_tables.sql) | |
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