Include the test-cases and the sketch of the algorithms for the common algorithm questions.
File Organization:
- basic: basic algorithms
- cc150: the problems in cracking the code interview
- dp: the popular dynamic programming problems, excluding the problems in cc150 and lc
- imagong: the problems on http://imagong.com/
- lc: the problems in leetcode
- recursive: the popular recursive problem, excluding the problems in cc150 and lc
#Problem List:
- binary search
- binary tree
- binary tree inorder iterator
- binary tree postorder iterator
- binary search tree (BST)
- +-*/ expression calculation
- bubble sort
- Burrows Wheeler Transform
- circular buffer
- data structure that supports O(1) add, del, and getRandom
- counting sort
- deduplicate
- find kth smallest
- find kth smallest in sorted matrix
- get binary tree paths
- get most continuous repeated characters
- hashmap
- find primes in range of n
- heap sort
- insertion sort
- find largest square submatrix
- find max with random position
- median of stream
- merge sort
- most repeated number
- one edit distance
- prime factors
- prime within range n
- quicksort iterative
- quicksort recursive
- random shuffle
- read4K
- remove zeros from array
- reverse string
- reverse words in string
- selection sort
- stack with min
- strcmp
- subarray sum
- subarray with sum zero
- trie
- union find
- union of two sorted linked list
- all unique character
- reverse string
- whether one string is the permutation of the other
- replace blank space with '%20'
- run-length encoding
- rotate image in place
- set matrix zeros
- check string rotation using substring
- remove duplicate from unsorted linked list
- find the kth to the last from a singly linked list (needs improvement)
- delete the middle element from linked list (needs improvement)
- partition list
- add numbers
- detect the begining of the loop
- check whether a linked list is a palindrome (needs improvement)
- use an array to implement three stacks (not implemented)
- add 'push', 'pop', and 'min' operations for stack, all operations should be in O(1)
- set of stacks
- hanoi
- implement a queue with two stacks
- sort the elements in stack in ascending order
- animal shelter
- validate balanced binary tree
- check whether route exists in a directed graph (needs improvement)
- create minimal height binary tree
- traverse binary tree by level (needs improvement)
- validate binary search tree
- link the next sibling of binary tree
- lowest common ancestor (LCA)
- sub-tree matching
- find all paths in a binary tree that sum to a specific value (needs improvement)
- insert bits M into N
- represent double in binary
- next number with same number of 1
- number of bits different between A and B
- swap odd and even bits in an integer
- find missing number with fetch operation
- Choose game
- probability of collision
- line intersection
- implement -, *, / with + only
- find line that evenly cuts two squares
- line passes the most points
- find the kth number consists of 3, 5, 7
- climbing stairs
- unique paths
- find the magic index
- generate all permutations
- generate parenthesis
- paint fill
- find changes
- eight queens
- tallest stack
- merge two arrays
- anagram
- search in rotated array
- find string in an empty string interspersed array
- find element in sorted matrix
- get the rank of elements in stream
- Swap two numbers in place
- Validate tic-tac-toe
- Counts # of trailing 0's in n!
- Find max without comparison
- Find range to sort
- Max subarray
- Implements rand7 using rand5
- Two sum
- Convert BST to Doubly Linked List
- Add two numbers withoug +
- Random suffling
- m out of n reservoir sampling
- Count # 2's in range 0 to n
- Find smallest 1 million in 1 billion
- Find the longest word made of other words in dictionary
- [Batched substring match] (https://github.com/yxjiang/algorithms/blob/master/src/main/java/algorithm/cc150/chapter18/Question8.java)
- Find the median of a sequence of data
- [Word Ladder] (https://github.com/yxjiang/algorithms/blob/master/src/main/java/algorithm/cc150/chapter18/Question10.java)
- [Maximal submatrix with black pixel borders] (https://github.com/yxjiang/algorithms/blob/master/src/main/java/algorithm/cc150/chapter18/Question11.java)
- Maximal submatrix
- find # distinct ways to reach score
- longest common substring (LCA)
- longest increasing subsequences (LIS)
- Add Binary (java)
- Add Two Numbers (python) (java)
- Anagram (python)
- Atoi (python)
- Balanced Binary Tree (python) (java)
- Best Time to Buy and Sell Stock (python) (java)
- Best Time to Buy and Sell Stock 2 (python) (java)
- Binary Tree Level Order Traversal (python) (java)
- Binary Tree Level Order Traversal II (python) (java)
- Binary Tree Inorder (python) (java)
- Binary Tree Inorder (python) (java)
- Binary Tree Maximum Path Sum (python) (java)
- Binary Tree Paths (python)
- Binary Tree Postorder (python) (java)
- Binary Tree Preorder (python) (java)
- Binary Watch (pyhon)
- Bulls and Cows (python)
- Climb Stairs (python) (java)
- Clone Graph (python)
- Combinations (python) (java)
- Construct Binary Tree from Inorder and Postorder Traversal (python) (java)
- Construct Binary Tree from Preorder and Inorder Traversal (python) (java)
- Contains Duplicate (python)
- Contains Duplicate (python)
- Count Primes (python)
- Counting Bits (python)
- Count Numbers with Unique Digits (python)
- Copy List With Random Pointer (python) (java)
- Container with Most Water (python) (java)
- Convert Sorted Array to BST (python) (java)
- Convert Sorted List to BST (python) (java)
- Delete Node in a Linked List (python)
- Distinct Subsequences (python) (java)
- Excel Sheet Column Number (python)
- Factorial Trailing Zeros (python)
- Find Minimum in Rotated Sorted Array (python) (java)
- Find the Difference (https://github.com/yxjiang/algorithms/blob/master/src/main/python/lc/find_the_difference.py))
- First Bad Version (python)
- First Unique Character in String (python)
- Flatten Binary Tree to Linked List (python) (java)
- Four Sum (python) (java)
- Gas Station (python) (java)
- Generate Parentheses (python) (java)
- Happy Number (python)
- Implement Queue using Stacks (python)
- Implement Stack using Queues (python)
- Integer Break (python)
- Integer Replacement (python)
- Integer to Roman (python) (java)
- Insertion Sort List (python) (java)
- Interleaving String (java)
- Intersection of Two Linked Lists (java)
- Intersection of Two Linked Lists II (python)
- Isomorphic Strings (python)
- Jump Game (python) (java)
- Jump Game II (python) (java))
- Largest Rectangle in Histogram (python) (java)
- Linked List Cycle (python) (java)
- Linked List Cycle II (python) (java)
- Linked List Random Node (python)
- Longest Common Prefix (python) (java)
- Longest Consecutive Sequence (python) (java)
- Longest Substring without Repeating Character (python) (java)
- Max Depth of Binary Tree (python) (java)
- Maximal Rectangle (python) (java)
- Maximum Subarray (python) (java)
- Maximum Product Subarray (python) (java)
- Merge K Sorted Lists (python) (java)
- Merge Two Sorted Lists (python) (java)
- Minimum Depth of Binary Tree (python) (java)
- Minimum Path Sum (python) (java)
- Multiply String (python) (java)
- Next Permutation (python) (java)
- Nth Digit (pyhon)
- N-Queens (python) (java)
- N-Queens II (python) (java)
- Number of Unique Binary Search Tree (python)
- Palindrome Linked List (python)
- Palindrome Partition (python) (java)
- Pascal Triangle (python) (java)
- Pascal Triangle II (python) (java)
- Path Sum (python) (java)
- Path Sum II (python) (java)
- Palindrome Pairs (python)
- Permutation (python) (java)
- Permutation II (python) (java)
- Permutation Sequence (python) (java)
- Plus One (python) (java)
- Populating Next Right Point in Each Node (python) (java)
- Populating Next Right Point in Each Node II (python) (java)
- Pow (python) (java)
- Power of 4 (python)
- Product of Array Except Self (python)
- Recover Binary Search Tree (python) (java)
- Rectangle Area (python)
- Regular Expression Matching (python) (java)
- Remove Duplicates from Sorted List (python) (java)
- Remove Duplicates from Sorted List II (python) (java)
- Remove Duplicates from Sorted Array (python) (java)
- Remove Duplicates from Sorted Array II (python) (java)
- Remove Element (python) (java)
- Remove Linked List Elements (python)
- Reorder List (python) (java)
- Reverse Bits (python)
- Reversed Linked List (python)
- Reversed Linked List II (python) (java)
- Reverse Int (python) (java)
- Reverse Word In a String (python) (java)
- Reverse Vowels of a String (python)
- Roman to Int (python) (java)
- Rotate Function (python)
- Rotate Image (python) (java)
- Rotate List (python) (java)
- Same Tree (python) (java)
- Search A 2D Matrix (python) (java)
- Search Insert Position (python)
- Set Matrix Zeros (python) (java)
- Shuffle an Array (python)
- Single Number (python) (java)
- Single Number II (python) (java)
- Single Number III (python)
- Sort Color (python) (java)
- Sort List (python) (java)
- Spiral Matrix (python) (java)
- Spiral Matrix II (python) (java)
- Sqrt (python) (java)
- Subset (python) (java)
- Substring with Concatenation of All Words (python) (java)
- Sum Root to Leaf Numbers (python) (java)
- Swap Nodes in Pairs (python) (java)
- Symmetric Tree (python) (java)
- Three Sum (python) (java)
- Three Sum Closest (python) (java)
- Top K Frequent Elements (python)
- Triangle (python) (java)
- Two Sum (python) (java)
- Two Sum II (python)
- Unique Binary Search Tree (python) (java)
- Unique Binary Search Tree (python) (java)
- Unique Paths (python) (java)
- Unique Paths II (python) (java)
- Validate BST (python) (java)
- Valid Palindrome (python) (java)
- Valid Parenthesis (python) (java)
- Valid Sudoku (python) (java)
- Wildcard Matching (python) (java)
- Word Break (python) (java)
- Word Pattern (python)
- Word Search (python) (java)
- Ugly Number (python)
- lowest common ancestor
- closest element in BST
- next palindrome
- number of zero groups
- generate all valid parenthesis consists of (, [, {, }, ], )
- max distance in array
- most repeated key in BST
- find anagram in dict
- find first missing
- find right deepest in binary tree
- plus minus expression calculation
- power of 3
- satisfied pairs
- satisfied triples
- substring anagram
- two dimensional trapping rain water
- weird sort