add readme

Author: xiaoningning

readme.md

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+# Algorithm
+
+#### Data Structure, algorithm, dynamic program, recursion and a little bit coding fun!
+
+## Introduction
+
+You are welcome to use code.  If you find any bug,  please file a issue.  I will fix it soon.  I will continue publishing new code whenever I see any interesting coding puzzle.
+
+## What are included:
+
+#### Puzzle Coding Fun:
+
+[Puzzle Coding] (https://github.com/xiaoningning/algorithm/tree/master/PuzzleCoding)
+It includes a collection of coding fun puzzles.
+
+ - AddBinary: add two binary number from string
+ - AddTwoNumber: add two number from arrays
+ - BSTtoDLL: convert binary search tree to double linked list
+ - BTreeIterator: binary tree iterator: in-order, pre-order, post-order
+ - BuildBT: build binary from array inputs
+ - ClimbStairs: climb stair problem
+ - CombinationPermutation: combination and permutation problems
+ - CombinationSum: the sum of combination in array
+ - CompareArrayBST: compare binary search tree
+ - DecodeNumber: how many ways to decode number
+ - FindMiddleShiftedSorted: find the middle elements of shifted sorted array
+ - GenerateParentheses: generate parentheses and valid parentheses string
+ - GrayCode: gray code
+ - HanoiTower: Hanoi tower game
+ - InsertCyclicList: insert element into a cyclic list
+ - IntervalComparator: merge interval comparator class
+ - IntToString: convert integer into A, B, C,.. AA, AB...
+ - IsBST: validate binary search tree
+ - IsBSTPostOrder: check if an array is a post-order bst.
+ - JumpGame: Jump Game
+ - LargestBSTSubtree: largest BST which may or may not include all children
+ - LongestBalanceSubstring: longest balanced substring
+ - LongestPalindrome: a linear way to find a longest palindrome string
+ - LongestStringWithoutRepeat: longest string without repeat
+ - MaxInWindow: max value in a sliding window
+ - MergeIntervals: merge intervals
+ - MergeSortedArray: k-way merge sorted arrays, using min heap
+ - MinCostSortedArray: cost to sort array
+ - MinCuttingWords: the minimal way to cut string based on dictionary
+ - MinHeap: min heap implementation
+ - MinPathSum:  min sum of path
+ - MinWindowSubString: minimal window of substring
+ - Node: tree node
+ - Queen: Queen game
+ - QueueByStack: implement queue with stack
+ - Rand: Random number, rejecting sampling
+ - RegexMatch: regex string match
+ - ScrambleString: scramble string puzzle
+ - SearchInRotatedSortedArray: search in rotated sorted array
+ - SecondLargeInt: the second large int in array
+ - SetMatrixZero: set matrix to zero (in-place)
+ - SimplifyUnixPath: simply unix directory path
+ - SpiralMatrix: generate spiral matrix
+ - StablePartition: in-place partition array
+ - StringAnagram: anagram string
+ - ThreeSumClosest: three sum closest to a num in array
+ - TreeLeafPath: tree leaf path print
+ - Trie: trie implementation
+ - ValidSudoku: valid Sudoku game
+ - WordEditDistance: calculate the distance of word
+ - ZigZagPrintMatrix: zigzag print matrix
+
+
+## Basic data structure and algorithm:
+
+- ActivityZero
+- allSubsets
+- BlockingQueue
+- boggleWords
+- boldTree
+- BTree
+- coin
+- DataCenterCooling
+- find2DArray
+- FindLargestSubMatrix
+- IntArrayOps
+- isNumber
+- longPalindromicString
+- LRU
+- MathOps
+- maxDist
+- MinCuttingWords
+- permutationStr
+- RePack
+- StringOps
+- sumZero
+- TreeOps
+- TriangleFunc
+
+
+## License
+
+There is no license.  If you want to use any code in book, please contact with me. Please feel free to refer the code with GitHub.
+