[第二期活动] 在职刷题打卡，目标工作日一天2题，周末一天5题

Day_17 (8/29)

Palindrome Pairs
Longest Increasing Subsequence

day 4
find the intersection point of two linked lists
find nth node from last in a linkedlist
swap nth node with head
merge two sorted linked list
linked list merge sort

打卡 Day 9 + Day 10

144. Binary Tree Preorder Traversal - DFS using stack
94. Binary Tree Inorder Traversal - Using Stack and Curr.
145. Binary Tree Postorder Traversal - 1. Reverse a preorder traversal. 2. Use queue.
100. Same Tree - DFS
101. Symmetric Tree - DFS
298. Binary Tree Longest Consecutive Sequence - DFS
366. Find Leaves of Binary Tree - DFS
198. House Robber - DP
337. House Robber III - DFS
235. Lowest Common Ancestor of a Binary Search Tree
236. Lowest Common Ancestor of a Binary Tree - Using DFS + Dict + Set - 重写一遍AC

#Day_29

今天有点忙，水一点，复习三道EZ DP
House Robber
Climbing Stairs
Maximum Subarray

day 26
Candy Crush
________
day 27
Segment Tree Build II
Segment Tree Build

打卡Day 11

173. Binary Search Tree Iterator - 重写 - 利用in-order, Amortized O(1)
230. Kth Smallest Element in a BST - in-order, O(k)
297. Serialize and Deserialize Binary Tree - in-order, O(n)
270. Closest Binary Search Tree Value - O(h)
272. Closest Binary Search Tree Value II - AC using inorder + priority queue

#Day_30

Construct Binary Tree from Preorder and Inorder Traversal
Reverse Linked List II

day 28
Remove Linked List Elements
Reverse Linked List II
Range Sum Query 2D - Immutable
lintcode
Segment Tree Modify
Segment Tree Build II
本月正式结束啦，算是刷了80题，比上个月60题进步了20题……还可以

day 5
reverse even nodes in a linked list
rotate a linked list