def fib(n):
  if n==1 or n==2:
    return 1
  else:
    return fib(n-1)+fib(n-2)

def fib(n):
  if isinstance(n, int):
    print('兄弟,输入正整数哈')
    return
  try:
    if n==1 or n==2:
      return 1
    elif n <= 0:
      print('兄弟别输入0或负数呀')
    else:
      return fib(n-1)+fib(n-2)
  except RecursionError:
    print('兄弟，超过了最大递归深度'

def fib(n):
  if n==1 or n == 2:
    return 1
  a, b = 1, 1
  for i in range(2, n):
    a, b = b, a+b
  return b

def YH_tri(a, b):
  if a == b or b == 0:
    return 1
  else:
    return YH_tri(a-1, b)+YH_tri(a-1, b-1)