#!/usr/bin/env python
# -*- coding:utf-8 -*-
from __future__ import division
from __future__ import unicode_literals
from __future__ import print_function



#!/usr/bin/env python
# -*- coding:utf-8 -*-
from __future__ import division
from __future__ import unicode_literals
from __future__ import print_function

def merge(list_a, list_b):
    pass

def mergeSort(arr):
    pass

def selectSort(arr):
    pass

def insertionSort(arr):
    pass

def quickSort(arr):
    pass

add some sorting stub