extend Graph
minor fix
using default template template parameters
add default pool allocator
leetcode
leetcode 86
Combinations and Permutations
function pointers
recursively iteratively morris pre/in/post order
Add keymap policy
fixed travis ci

http://stackoverflow.com/questions/5286922/g-template-parameter-error
fixed Big Endian
refactor
using hashmap as adjacency list
run tests on travis ci
run tests on travis ci
run tests on travis ci
fixed graph test
Add Floyd_Warshall
Add Maximum Flow Method Edmonds-Karp