Openning

This is a blog that write to myself, as a notebook recording what I've learnt.

I am a very lazy entry-level developer. I would like to record everything important, challenging, interesting or useful in this blog.

My plan so far, includes finishing all 150 problems in Leetcode Online Judge (http://oj.leetcode.com/) with the next 2 - 3 months.

Since I am now working as an Android Developer, I may also post some problems that I met during work.

Some study plan includes how to use emacs as text editor, new techniques like Hadoop, cloud computing...

BTW, I use Java primarily, but may also include some code in C, Cpp or Perl, three languages that I know but not very skillful. 

Leetcode 现有150题，按照AC rate (accepted rate?) 从大到小排序，也就是越简单的排在越前面。我将按照这个顺序逐个击破这150道题。

当然我的算法不一定是最好的，所以我也会贴出别人的算法，不同的或者更优的。 

	Single Number	2013-10-01	45.7%
	Maximum Depth of Binary Tree	2012-09-29	45.6%
	Same Tree	2012-09-03	43.2%
	Reverse Integer	2011-12-25	40.8%
	Best Time to Buy and Sell Stock II	2012-10-30	35.4%
	Linked List Cycle	2013-10-28	35.4%
	Unique Binary Search Trees	2012-08-27	34.8%
	Populating Next Right Pointers in Each Node	2012-10-28	34.2%
	Search Insert Position	2012-03-03	34.0%
	Remove Duplicates from Sorted List	2012-04-22	33.9%
	Binary Tree Preorder Traversal	2013-11-05	33.4%
	Binary Tree Inorder Traversal	2012-08-27	33.4%
	Remove Element	2012-02-16	33.2%
	Remove Duplicates from Sorted Array	2012-02-16	33.2%
	Climbing Stairs	2012-04-03	33.1%
	Maximum Subarray	2012-03-21	32.7%
	Symmetric Tree	2012-09-23	32.4%
	Merge Two Sorted Lists	2012-03-30	32.3%
	Convert Sorted Array to Binary Search Tree	2012-10-02	32.2%
	Roman to Integer	2012-01-15	32.1%
	Swap Nodes in Pairs	2012-02-14	31.9%
	Merge Sorted Array	2012-05-20	31.9%
	Pascal's Triangle	2012-10-28	31.6%
	Best Time to Buy and Sell Stock	2012-10-30	31.5%
	Balanced Binary Tree	2012-10-08	31.3%
	Binary Tree Level Order Traversal II	2012-10-01	30.8%
	Permutations	2012-03-16	30.7%
	Gray Code	2012-05-20	30.7%
	Integer to Roman	2012-01-15	30.5%
	Linked List Cycle II	2013-10-30	30.3%
	Single Number II	2013-10-02	30.3%
	Unique Paths	2012-03-28	30.2%
	Minimum Path Sum	2012-03-28	30.2%
	Rotate Image	2012-03-17	30.1%
	Container With Most Water	2012-01-08	29.9%
	Generate Parentheses	2012-02-12	29.8%
	Binary Tree Level Order Traversal	2012-09-28	29.8%
	Search a 2D Matrix	2012-04-06	29.8%
	Set Matrix Zeroes	2012-04-05	29.8%
	Plus One	2012-04-02	29.7%
	Binary Tree Postorder Traversal	2013-11-07	29.6%
	Combinations	2012-04-18	29.5%
	Remove Duplicates from Sorted Array II	2012-04-19	29.5%
	Path Sum	2012-10-13	29.4%
	Spiral Matrix II	2012-03-27	29.3%
	Pascal's Triangle II	2012-10-28	29.3%
	Sort Colors	2012-04-08	29.2%
	Remove Nth Node From End of List	2012-01-27	29.2%
	Search in Rotated Sorted Array II	2012-04-19	29.0%
	Populating Next Right Pointers in Each Node II	2012-10-28	29.0%
	Palindrome Number	2012-01-04	28.9%
	Minimum Depth of Binary Tree	2012-10-09	28.0%
	Search in Rotated Sorted Array	2012-03-02	27.7%
	Sum Root to Leaf Numbers	2013-02-18	27.6%
	Valid Parentheses	2012-01-30	27.5%
	Trapping Rain Water	2012-03-10	27.4%
	3Sum Closest	2012-01-18	27.4%
	Jump Game	2012-03-24	26.9%
	Subsets II	2012-06-25	26.7%
	Longest Common Prefix	2012-01-17	26.7%
	Valid Sudoku	2012-03-03	26.7%
	Subsets	2012-04-18	26.6%
	Length of Last Word	2012-03-27	26.4%
	Path Sum II	2012-10-14	26.4%
	Search for a Range	2012-03-02	26.1%
	Unique Paths II	2012-03-28	26.1%
	Convert Sorted List to Binary Search Tree	2012-10-02	26.0%
	Count and Say	2012-03-05	25.9%
	Triangle	2012-10-29	25.8%
	Longest Consecutive Sequence	2013-02-13	25.7%
	Combination Sum	2012-03-06	25.5%
	Binary Tree Zigzag Level Order Traversal	2012-09-28	25.5%
	N-Queens II	2012-03-20	25.5%
	Validate Binary Search Tree	2012-08-31	25.4%
	Permutations II	2012-03-16	25.3%
	Unique Binary Search Trees II	2012-08-27	25.2%
	Next Permutation	2012-02-25	25.2%
	Partition List	2012-04-30	25.2%
	Insertion Sort List	2013-11-12	25.2%
	Flatten Binary Tree to Linked List	2012-10-14	25.2%
	Pow(x, n)	2012-03-19	25.1%
	N-Queens	2012-03-19	24.7%
	Reverse Linked List II	2012-06-27	24.5%
	Edit Distance	2012-04-04	24.4%
	Add Binary	2012-04-02	24.3%
	Remove Duplicates from Sorted List II	2012-04-22	24.2%
	Construct Binary Tree from Inorder and Postorder Traversal	2012-09-30	24.2%
	Construct Binary Tree from Preorder and Inorder Traversal	2012-09-30	24.2%
	Letter Combinations of a Phone Number	2012-01-26	24.2%
	Palindrome Partitioning	2013-02-27	23.7%
	Gas Station	2013-09-28	23.0%
	Distinct Subsequences	2012-10-18	22.9%
	Reverse Nodes in k-Group	2012-02-15	22.8%
	Combination Sum II	2012-03-06	22.7%
	Longest Substring Without Repeating Characters	2011-05-15	22.7%
	Jump Game II	2012-03-16	22.4%
	Add Two Numbers	2011-11-01	22.4%
	Anagrams	2012-03-19	22.3%
	Merge k Sorted Lists	2012-02-13	22.0%
	Two Sum	2011-03-13	21.8%
	ZigZag Conversion	2011-12-05	21.6%
	4Sum	2012-01-26	21.5%
	Longest Palindromic Substring	2011-11-11	21.3%
	Sqrt(x)	2012-04-03	21.2%
	Rotate List	2012-03-27	21.2%
	Best Time to Buy and Sell Stock III	2012-11-06	21.1%
	First Missing Positive	2012-03-08	21.0%
	Valid Palindrome	2013-01-12	21.0%
	Recover Binary Search Tree	2012-09-01	20.5%
	Permutation Sequence	2012-03-27	20.3%
	Insert Interval	2012-03-27	20.2%
	Scramble String	2012-04-30	19.9%
	Spiral Matrix	2012-03-24	19.6%
	Sudoku Solver	2012-03-04	19.6%
	Largest Rectangle in Histogram	2012-04-22	19.5%
	Maximal Rectangle	2012-04-23	19.5%
	Implement strStr()	2012-02-18	19.5%
	Restore IP Addresses	2012-08-07	19.4%
	Merge Intervals	2012-03-26	19.4%
	Clone Graph	2013-09-24	19.3%
	Copy List with Random Pointer	2013-10-03	19.3%
	Word Search	2012-04-18	19.1%
	Evaluate Reverse Polish Notation	2013-11-27	19.0%
	Regular Expression Matching	2012-01-08	19.0%
	Multiply Strings	2012-03-12	18.5%
	Simplify Path	2012-04-03	18.3%
	Binary Tree Maximum Path Sum	2012-11-07	18.2%
	Word Break	2013-10-04	18.2%
	Longest Valid Parentheses	2012-02-29	17.9%
	Sort List	2013-11-16	17.7%
	Reorder List	2013-11-02	17.6%
	Interleaving String	2012-08-30	17.4%
	3Sum	2012-01-17	16.7%
	Palindrome Partitioning II	2013-02-28	16.7%
	Minimum Window Substring	2012-04-15	16.4%
	Substring with Concatenation of All Words	2012-02-23	16.1%
	Candy	2013-09-30	15.7%
	Median of Two Sorted Arrays	2011-03-27	15.5%
	Decode Ways	2012-06-25	15.1%
	Divide Two Integers	2012-02-18	15.1%
	Word Ladder	2013-02-10	15.0%
	String to Integer (atoi)	2011-12-26	14.7%
	Surrounded Regions	2013-02-21	14.6%
	Text Justification	2012-04-03	12.6%
	Word Break II	2013-10-05	12.4%
	LRU Cache	2013-11-09	11.4%
	Wildcard Matching	2012-03-15	11.1%
	Valid Number	2012-04-02	9.8%
	Max Points on a Line	2013-11-22	9.4%
	Word Ladder II	2013-02-10	8.1%