update doc/cheatsheet format

Author: yennanliu

doc/cheatsheet/Collection.md

@@ -1,6 +1,14 @@
 # Collection cheatsheet 
 
-### 1) collection.Counter
+## 0) Concept  
+
+### 0-1) Framework
+
+### 0-2) Pattern
+
+## 1) General form
+
+### 1-1) collection.Counter
 ```python
 import collections
 s = ['a','b','c','c']
@@ -10,7 +18,7 @@ print (c.keys())
 print (c.values())
 ```
 
-### 1-1) Important method - most_common()
+### 1-2) Important method - most_common()
 ```python
 # 451 Sort Characters By Frequency
 import collections
@@ -23,7 +31,7 @@ for item, freq in count:
 #b 1
 ```
 
-### 2) collection.defaultdict (int, list...)
+### 1-3) collection.defaultdict (int, list...)
 ```python
 import collections
 s = ['a','b','c','c']

doc/cheatsheet/bfs.md

@@ -1,6 +1,12 @@
 # BFS cheatsheet 
 
-### 1) General form
+## 0) Concept  
+
+### 0-1) Framework
+
+### 0-2) Pattern
+
+## 1) General form
 ```python
 # V1 : via collections.deque
 import collections
@@ -34,6 +40,10 @@ def bfs(root):
 
 ```
 
+### 1-1) Basic OP
+
+## 2) LC Example
+
 ### 2-1) Word Ladder
 ```python
 # 127 Word Ladder
@@ -55,4 +65,4 @@ class Solution(object):
                         bfs.append((newWord, length + 1))
         return 0
 
-```
+```

doc/cheatsheet/binary_search.md

@@ -1,6 +1,12 @@
 # Binary Search Cheatsheet
 
-### 1) General form 
+## 0) Concept  
+
+### 0-1) Framework
+
+### 0-2) Pattern
+
+## 1) General form
 ```python
 def binary_search(nums, target):
 	l, r = 0, len(nums)-1
@@ -15,6 +21,8 @@ def binary_search(nums, target):
 	return -1
 
 ```
+## 2) LC Example
+
 
 ### 2-1) For loop + binary search
 ```python

doc/cheatsheet/hash_map.md

@@ -1,7 +1,12 @@
 # Hash Map Cheatsheet
 
-### 1) General form 
+## 0) Concept  
 
+### 0-1) Framework
+
+### 0-2) Pattern
+
+## 1) General form
 <p align="center"><img src ="https://github.com/yennanliu/CS_basics/blob/master/doc/pic/hash_table_2.png" ></p>
 
 - Definition 
@@ -20,4 +25,6 @@
 
 - Ref 
 	- https://blog.techbridge.cc/2017/01/21/simple-hash-table-intro/
-	- https://www.freecodecamp.org/news/hash-tables/
+	- https://www.freecodecamp.org/news/hash-tables/
+
+## 2) LC Example

doc/cheatsheet/heap.md

@@ -1,15 +1,18 @@
 # Heap cheatsheet 
 
-### 1) General form
-- dev
+## 0) Concept  
 
-### 2) Heap VS Stack VS Queue
-- dev 
+### 0-1) Framework
 
-### 3) Basic OP
-- dev
+### 0-2) Pattern
 
-### 4-1) Heap sort
+## 1) General form
+
+### 1-1) Basic OP
+
+### 1-2) Heap VS Stack VS Queue
+
+### 1-3) Heap sort
 ```python
 # https://docs.python.org/zh-tw/3/library/heapq.html
 def heapsort(iterable):
@@ -24,10 +27,11 @@ def heapsort(iterable):
 
 ``` 
 
-### 4-2) Priority Queue
-- dev
+### 1-4) Priority Queue
+
+## 2) LC Example
 
-### 4-3) Kth Largest Element in a Stream
+### 2-1) Kth Largest Element in a Stream
 ```python
 # 703 Kth Largest Element in a Stream
 class KthLargest(object):

doc/cheatsheet/palindrome.md

@@ -1,14 +1,22 @@
 # Palindrome cheatsheet 
 
-### 1) General form
+## 0) Concept  
+
+### 0-1) Framework
+
+### 0-2) Pattern
+
+## 1) General form
 ```python
 def check_palindrome(x):
 	return x == x[::-1]
 ```
 
-### 2) Example
+### 1-1) Basic OP
+
+## 2) LC Example
 
-#### 2-1)
+#### 2-1) Palindrome Partitioning
 ```python
 # 131 Palindrome Partitioning
 class Solution(object):

doc/cheatsheet/queue.md

@@ -1,10 +1,18 @@
 # Queue cheatsheet 
 
-### 1) General form
+## 0) Concept  
 
-### 2-1) Queue
+### 0-1) Framework
 
-### 2-2) Double-ended Queue
+### 0-2) Pattern
+
+## 1) General form
+
+### 1-1) Basic OP
+
+### 1-2) Queue
+
+### 1-3) Double-ended Queue
 ```python
 # https://pymotw.com/2/collections/deque.html
 import collections
@@ -19,5 +27,4 @@ print ('pop_left:' , d.popleft())
 print (d)
 
 ```
-
-### 2-3) Stack simulate Queue
+### 1-4) Stack simulate Queue

doc/cheatsheet/string.md

@@ -1,11 +1,16 @@
 # String cheatsheet 
 
-### 1) General form
-- dev 
+## 0) Concept  
 
-### 2) Example
+### 0-1) Framework
 
-#### 2-1) go through 2 string, keep comparing digits in eash string
+### 0-2) Pattern
+
+## 1) General form
+
+## 2) LC Example
+
+### 2-1) go through 2 string, keep comparing digits in eash string
 ```python
 # 165 Compare Version Number
 class Solution(object):
@@ -27,7 +32,7 @@ class Solution(object):
         return 0
 ```
 
-#### 2-2) String -> Int
+### 2-2) String -> Int
 ```python
 # 445 Add Two Numbers II
 # 394 Decode String

doc/progress.md

@@ -38,6 +38,7 @@
 	- 606 Construct String from Binary Tree
 	- 459 Repeated Substring Pattern
 - Review:
+	- `cheatsheet/dfs.md`
 	- 098 Validate Binary Search Tree
 	- [AMZ V1](https://github.com/yennanliu/CS_basics/blob/master/doc/leetcode_company_V1/Amazon%20-%20LeetCode.pdf) - 12/13
 	- Review `data/to_review.txt`