Add README.md

.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# locals
+.env
+/.locals

README.md

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-# chickencode
+# Chickencode
+Discuss the problem of [leetcode](https://leetcode.com/problemset/all) if you are boring
+
+## Rules
+### How to commit
+1. Create folder according the problem number under problems folder if it doesn't exists.
+2. Copy your solution from leetcode under the above folder even if it's failed
+   - ex. `/problems/${# of problem}/${name}.js`
+3. Create pull requests for your solution
+
+### How to create pull request
+1. Try to write all of the thoughts you ever have even if it's brute force or not work
+2. Try to explain why it works as much as possible
+3. Try to explain your time complexity as much as possible
+4. If you cannot solve the problems, you can describe what's the problem you encounter
+   - ex. no ideas, timeout or etc
+5. all of above are nice to have, so it's okay to make the description of PR be empty :)
+
+## Algorithms
+### Data structures
+- Array
+- Hash Table
+- Linked List
+- Stack
+- Heap
+  - Max/Min heap
+- Queue
+- Priority Queue
+- Tree
+  - Complete Binary Tree
+  - Binary Search Tree
+  - Binary Indexed Tree
+  - Segment Tree
+
+### Two Pointers (Sliding Window)
+- Longest Substring Without Repeating Characters
+- Longest Palindromic Substring
+
+### Selection
+- Quick Select
+  - [K’th Smallest/Largest Element in Unsorted Array](https://www.geeksforgeeks.org/kth-smallestlargest-element-unsorted-array-set-2-expected-linear-time/)
+  - [K’th Smallest/Largest Element in Unsorted Array in Expected Linear Time](https://www.geeksforgeeks.org/kth-smallestlargest-element-unsorted-array-set-2-expected-linear-time/)
+- median of median
+- Linear Search
+- Binary Search
+- Jump Search
+- Interpolation Search
+- Exponential Search
+- Ternary Search
+
+### Sorting
+- Selection Sort
+- Bubble Sort
+- Insertion Sort
+- Merge Sort
+- Heap Sort
+- QuickSort
+- Radix Sort
+- Counting Sort
+- Bucket Sort
+- ShellSort
+- Comb Sort
+- Pigeonhole Sort
+- Cycle Sort
+
+### Divide and Conquer
+- [Median of two sorted arrays](https://www.geeksforgeeks.org/median-of-two-sorted-arrays/)
+
+### Dynamic Programming
+- Maximum Subarray
+- [Longest Common Subsequence](https://www.geeksforgeeks.org/longest-common-subsequence-dp-4/)
+- Matchsticks to Square
+
+### Mathematical
+
+### Bit Manipulation
+- [Find the element that appears once](https://www.geeksforgeeks.org/find-the-element-that-appears-once/)
+- [Add two numbers](https://www.geeksforgeeks.org/add-two-numbers-without-using-arithmetic-operators/)
+
+### Backtracking
+- [Print all permutations of a given string](https://www.geeksforgeeks.org/write-a-c-program-to-print-all-permutations-of-a-given-string/)
+- Generate Parentheses
+
+### String
+- Manacher’s Algorithm – Linear Time Longest Palindromic Substring
+  – [Part 1](https://www.geeksforgeeks.org/manachers-algorithm-linear-time-longest-palindromic-substring-part-1/)
+  - [Part 2](https://www.geeksforgeeks.org/manachers-algorithm-linear-time-longest-palindromic-substring-part-2/)
+  - [Part 3](https://www.geeksforgeeks.org/manachers-algorithm-linear-time-longest-palindromic-substring-part-3-2/)
+  - [Part 4](https://www.geeksforgeeks.org/manachers-algorithm-linear-time-longest-palindromic-substring-part-4/)
+
+### Greedy
+- [Activity Selection Problem](https://www.geeksforgeeks.org/greedy-algorithms-set-1-activity-selection-problem/)
+
+### DFS
+- Matchsticks to Square
+
+### BFS
+
+### Others
+- Data
+- Union Find
+- Graph
+- Design
+- Topological Sort
+- Trie
+- Recursion
+- Brainteaser
+- Memoization
+- Minimax
+- Sampling
+- Reservoir Sampling
+- Rejection Sampling
+- Map
+- Geometry
+- Random
+
+### References
+- [Fundamentals of Algorithms](https://www.geeksforgeeks.org/fundamentals-of-algorithms/)
+- [演算法筆記](http://www.csie.ntnu.edu.tw/~u91029/index.html)
+- [Introduction · LeetCode 題解](https://siddontang.gitbooks.io/leetcode-solution/content/)