Hello, I am Happy Lee, a graduate of the class of 2020 majoring in Software Engineering of Dalian University of Technology this year. I live in a small village in Daoxian County, Yongzhou city, Hunan Province. This is the first time for me to work in a big city like Shenzhen, so I want to record my daily life in Shenzhen by video.

LeetCode Review One-Take Vlog: Problem 103 - Binary Tree Zigzag Level Order Traversal
16:21
LeetCode Review One-Take Vlog: Problem 103 - Binary Tree Zigzag Level Order Traversal
LeetCode Review One-Take Vlog: Problem 102 - Binary Tree Level Order Traversal
14:06
LeetCode Review One-Take Vlog: Problem 102 - Binary Tree Level Order Traversal
LeetCode Review One-Take Vlog: Problem 637 - Average of Levels in Binary Tree
16:55
LeetCode Review One-Take Vlog: Problem 637 - Average of Levels in Binary Tree
LeetCode Review One-Take Vlog: Problem 199 - Binary Tree Right Side View
15:44
LeetCode Review One-Take Vlog: Problem 199 - Binary Tree Right Side View
LeetCode Review One-Take Vlog: Problem 236 - Lowest Common Ancestor of a Binary Tree
15:51
LeetCode Review One-Take Vlog: Problem 236 - Lowest Common Ancestor of a Binary Tree
LeetCode Quick Review One-Take Vlog: Problem 222 - Count Complete Tree Nodes
18:55
LeetCode Quick Review One-Take Vlog: Problem 222 - Count Complete Tree Nodes
LeetCode Quick Review One-Take Vlog: Problem 173 - Binary Search Tree Iterator
13:21
LeetCode Quick Review One-Take Vlog: Problem 173 - Binary Search Tree Iterator
LeetCode Quick Review One-Take Vlog: Problem 124 - Binary Tree Maximum Path Sum
9:41
LeetCode Quick Review One-Take Vlog: Problem 124 - Binary Tree Maximum Path Sum
LeetCode Quick Review One-Take Vlog: Problem 129- Path Sum
22:04
LeetCode Quick Review One-Take Vlog: Problem 129- Path Sum
LeetCode Quick Review One-Take Vlog: Problem 112- Path Sum
18:58
LeetCode Quick Review One-Take Vlog: Problem 112- Path Sum
LeetCode Quick Review One-Take Vlog: Problem 114 - Flatten Binary Tree to Linked List.
17:30
LeetCode Quick Review One-Take Vlog: Problem 114 - Flatten Binary Tree to Linked List.
LeetCode Quick Review Vlog: Problem 117 - Populating Next Right Pointers in Each Node II
11:36
LeetCode Quick Review Vlog: Problem 117 - Populating Next Right Pointers in Each Node II
LeetCode Quick Review Vlog: Problem 106 - Construct Binary Tree from Inorder and Postorder Traversal
15:45
LeetCode Quick Review Vlog: Problem 106 - Construct Binary Tree from Inorder and Postorder Traversal
LeetCode Quick Review Vlog: Problem 105 - Construct Binary Tree from Preorder and Inorder Traversal
14:09
LeetCode Quick Review Vlog: Problem 105 - Construct Binary Tree from Preorder and Inorder Traversal
LeetCode Quick Review Vlog: Problem 101 - Symmetric Tree
12:36
LeetCode Quick Review Vlog: Problem 101 - Symmetric Tree
LeetCode Quick Review Vlog: Problem 226 - Invert Binary Tree
9:48
LeetCode Quick Review Vlog: Problem 226 - Invert Binary Tree
LeetCode Quick Review Vlog: Problem 100 - Same Tree
12:49
LeetCode Quick Review Vlog: Problem 100 - Same Tree
LeetCode Quick Review Vlog: Problem 104 - Maximum Depth of Binary Tree
12:38
LeetCode Quick Review Vlog: Problem 104 - Maximum Depth of Binary Tree
LeetCode Quick Review Vlog: Problem 146 - LRU Cache
13:55
LeetCode Quick Review Vlog: Problem 146 - LRU Cache
LeetCode Quick Review Vlog: Problem 86 - Partition List
6:48
LeetCode Quick Review Vlog: Problem 86 - Partition List
LeetCode Quick Review Vlog: Problem 61 - Rotate List
8:59
LeetCode Quick Review Vlog: Problem 61 - Rotate List
LeetCode Quick Review Vlog: Problem 82 - Remove Duplicates from Sorted List II
7:10
LeetCode Quick Review Vlog: Problem 82 - Remove Duplicates from Sorted List II
LeetCode Quick Review Vlog: Problem 19 - Remove Nth Node From End of List
6:07
LeetCode Quick Review Vlog: Problem 19 - Remove Nth Node From End of List
LeetCode Quick Review Vlog: Problem 25 - Reverse Nodes in k-Group
10:26
LeetCode Quick Review Vlog: Problem 25 - Reverse Nodes in k-Group
LeetCode Quick Review Vlog: Problem 92 - Reverse Linked List II
9:04
LeetCode Quick Review Vlog: Problem 92 - Reverse Linked List II
LeetCode Quick Review Vlog: Problem 138 - Copy List with Random Pointer
10:20
LeetCode Quick Review Vlog: Problem 138 - Copy List with Random Pointer
LeetCode Quick Review Vlog: Problem 21 - Merge Two Sorted Lists
6:39
LeetCode Quick Review Vlog: Problem 21 - Merge Two Sorted Lists
LeetCode Quick Review Vlog: Problem 2 - Add Two Numbers
9:16
LeetCode Quick Review Vlog: Problem 2 - Add Two Numbers
LeetCode Quick Review Vlog: Problem 141 - Linked List Cycle
7:06
LeetCode Quick Review Vlog: Problem 141 - Linked List Cycle
LeetCode Quick Review Vlog: Problem 224 - Basic Calculator
14:15
LeetCode Quick Review Vlog: Problem 224 - Basic Calculator