text: ﻿#  学号:1827402015
  #  姓名:金晗昕
  #  IP:192.168.157.231
  #  上传时间:2018/11/12 15:21:51
  
  import math
  def func1(a,b):
      return
  
  def func2(a,b):
      return
              
  def func3(ls
  
  if __name__=="__main__":
  	pass
  