https://instant.1point3acres.com/thread/220265

• [x] merge sorted array
• [x] clone graph

https://instant.1point3acres.com/thread/220282

• [x] string, dict

https://instant.1point3acres.com/thread/220428

• [x] lc 296 best meeting point

https://instant.1point3acres.com/thread/219429

• [x] lc 150 stack
• [x] 类似lc 150, follow-up

https://instant.1point3acres.com/thread/219949

• [x] return all consecutive ranges
• [x] perfect squares

https://instant.1point3acres.com/thread/219014

• [x] String, discontinuous matching, lc 115
• [x] range sum query

https://instant.1point3acres.com/thread/219617

• [x] sorted array, return numbers appear larger than n/4 times
• [x] longest common prefix

https://instant.1point3acres.com/thread/215275

• [ ] fizz buzz and follow ups
• [x] hash table vs binary search tree
• [x] find integer in a string

https://instant.1point3acres.com/thread/219286

• [x] same tree
• [x] one tree has another and follow up
• [x] http://www.geeksforgeeks.org/check-if-a-binary-tree-is-subtree-of-another-binary-tree/

https://instant.1point3acres.com/thread/219248

• [x] similar to LRU
• [x] map in java?

https://instant.1point3acres.com/thread/219298

• [x] bfs 建房子

https://instant.1point3acres.com/thread/217057

• [x] lc 158 read bytes

https://instant.1point3acres.com/thread/218484

• [x] lc 329 longest increasing path in matrix

https://instant.1point3acres.com/thread/216165

• [x] lc 279 返回不同

https://instant.1point3acres.com/thread/206478

• [x] longest palindrome substring
• [ ] histogram

https://instant.1point3acres.com/thread/218450

• [x] count bits
• [x] valid parenthesis
• [x] remove first occurrence in linkedlist

https://instant.1point3acres.com/thread/218451

• [ ] byte
• [ ] big file?
• [x] count 1s

https://instant.1point3acres.com/thread/218126

• [x] plus one
• [ ] subtree 找node pair

https://instant.1point3acres.com/thread/213972

• [x] high frequency letters
• [x] walls and gates
• [x] ssn

https://instant.1point3acres.com/thread/208875

• [x] insert interval

https://instant.1point3acres.com/thread/212383

• [ ] 24点

https://instant.1point3acres.com/thread/202377?from_discuz=1

• [x] flatten binary search tree

http://www.1point3acres.com/bbs/thread-218490-1-1.html

• [ ] duplicate number
• [ ] reverse list

http://www.1point3acres.com/bbs/forum.php?mod=viewthread&tid=225644

• [x] bfs, a -> b

https://instant.1point3acres.com/thread/212213

• [ ] lc 43
• [ ] 下棋 赢
• [ ] 马尔可夫链

https://instant.1point3acres.com/thread/211298

• [x] implement queue
• [ ] multithread and lock

https://instant.1point3acres.com/thread/211514

• [x] evaluate operator http://www.geeksforgeeks.org/expression-evaluation/
• [x] symmtric tree with follow up

http://www.1point3acres.com/bbs/thread-224290-1-1.html

• [x] trie， 加粗

https://instant.1point3acres.com/thread/205299

• [x] 2d matrix, game of life

https://instant.1point3acres.com/thread/202157

• [x] search word
• [x] heap vs stack memory
• [x] remove duplicates in big file
• [x] lc, balanced binary tree
• [x] valid parentheses

https://instant.1point3acres.com/thread/204379

• [x] calculator with double numbers

https://instant.1point3acres.com/thread/202350

• [x] list of points in a plane
• [x] smallest rectangular

https://instant.1point3acres.com/thread/202350

• [ ] 排序
• [ ] bulb switcher
• [ ] manager, dfs

https://instant.1point3acres.com/thread/199023

• [x] combinations
• [x] buffer, read, 157? 148!

https://instant.1point3acres.com/thread/195357

• [ ] loggin system
• [ ] set
• [ ] memory

http://www.1point3acres.com/bbs/thread-215080-1-1.html

• [ ] lc 163

https://instant.1point3acres.com/thread/214278

• [ ] black pixel
• [ ] board color

https://instant.1point3acres.com/thread/207446

• [ ] garbage collection
• [x] count set bits in an integer
• [x] valid 括号
• [x] linked list remove number

https://instant.1point3acres.com/thread/212871

• [x] count complete tree nodes
• [ ] gas station

https://instant.1point3acres.com/thread/199220

• [x] data structure
• [ ] bfs dfs + memorization

https://instant.1point3acres.com/thread/206795

• [ ] sensor status

https://instant.1point3acres.com/thread/212733

• [x] trie prefix

https://instant.1point3acres.com/thread/212466

• [x] 猜词

https://instant.1point3acres.com/thread/202400

• [ ] rectangular
• [x] kth number in two arrays

https://instant.1point3acres.com/thread/184177

• [ ] permutation palindrome
• [ ] test
• [ ] count 1 bits, hamming weight in O1 => check StackOver flow

https://instant.1point3acres.com/thread/204915

• [ ] longest sequences of 1s
• [ ] follow-up flip 0

https://instant.1point3acres.com/thread/204693

• [ ] longest palindrome in big file

https://instant.1point3acres.com/thread/206176

• [ ] multithread
• [ ] relational schema
• [ ] 373 + follow up

http://www.1point3acres.com/bbs/thread-216907-1-1.html

• [x] parenthese
• [ ] two arrays, return diff and common
• [ ] binary tree max path

https://instant.1point3acres.com/thread/198108

• [ ] unsorted array

https://instant.1point3acres.com/thread/188791

• [x] insert interval

https://instant.1point3acres.com/thread/192632

• [ ] comments

http://www.1point3acres.com/bbs/thread-224113-1-1.html

• [ ] array vs linked list 区别
• [ ] missing number and follow ups

https://instant.1point3acres.com/thread/193002

• [ ] remove comments in a file

https://instant.1point3acres.com/thread/198072

• [ ] longest path in matrix

http://www.1point3acres.com/bbs/thread-214962-1-1.html

• [x] trie

http://www.1point3acres.com/bbs/thread-212943-1-1.html

• [ ] disinct subsequece

https://instant.1point3acres.com/thread/192918

• [x] reverse vowels in a string
• [ ] http://blog.csdn.net/v_july_v/article/details/7382693
• [ ] OOP, abstract vs interface

https://instant.1point3acres.com/thread/197676, https://instant.1point3acres.com/thread/192966

• [x] graph valid tree
• [ ] Recover Binary Search Tree

https://instant.1point3acres.com/thread/199249

• [x] spiral matrix
• [ ] bst inorder traversal

https://instant.1point3acres.com/thread/189813

• [ ] lc 240
• [ ] lc 373 378

https://instant.1point3acres.com/thread/198516

• [ ] lc 394 + follow up

https://instant.1point3acres.com/thread/204842

• [ ] pow
• [ ] find a and b in a big file

https://instant.1point3acres.com/thread/200231

• [ ] is-same-permutation

http://www.1point3acres.com/bbs/thread-207729-1-1.html

• [ ] expression tree

https://instant.1point3acres.com/thread/193396

• [ ] convert decimal to 2进制-16进制，lc 405

http://www.1point3acres.com/bbs/thread-206754-1-1.html

• [ ] add two numbers
• [x] zigzag iterator

https://instant.1point3acres.com/thread/193390

• [x] lc 163
• [ ] maximum depth?