new_contents: """560. Subarray Sum Equals K
  Medium
  
  Given an array of integers and an integer k, you need to find the total 
  number of continuous subarrays whose sum equals to k.
  
  Example 1:
  Input: nums = [1,1,1], k = 2
  Output: 2
  
  Note:
  The length of the array is in range [1, 20,000].
  The range of numbers in the array is [-1000, 1000] and the range of the 
  integer k is [-1e7, 1e7].
  """
  
  class Solution(object):
      def subarraySum(self, nums, k):
          """
          :type nums: List[int]
          :type k: int
          :rtype: int
          """
          pass
  
  
  def main():
      import time
  
      nums = [1,1,1]
      k = 2
  
  
  if __name__ == '__main__':
      main()
  
subject: Add lc560_subarray_sum_equals_k.py