message: Update handshakes-that-dont-cross.py
diff: @@ -8,7 +8,7 @@ class Solution(object):
  :rtype: int
  """
  MOD = 10**9+7
  - def inv(x, m):
  + def inv(x, m): # Euler's Theorem
  return pow(x, m-2, m) # O(logMOD) = O(1)
  def nCr(n, k, m):
  