add README.md file
leetcode branch first push
problem 3 wrong answer
max sum of sub array
commit leetcode sort list
Merge branch 'master' of https://github.com/bruceSz/learnToexcellent into leetcode
insertion sort and part of LRU cache
algorithm class note and lru
class note and problems
 lru finished with wrong answer
linked list:cycle problem
reorder list
preorder traversal binary tree
class 3:algorithm
word break 1
add atoi
post order traversal binary tree
word break 1 ,time limited exceed
word break 2 ;half done
word break 2;single number 1 & 2
dynamic_method:metaclass