comefrom: <doocs>0070.Climbing Stairs_1.py
code: def climbStairs( n: int) -> int:
      a, b = 0, 1
      for _ in range(n):
          a, b = b, a + b
      return b
masked: def sample_funcname ( var_0 : int ) -> int :
      var_3 , var_5 = 0 , 1
      for var_7 in range ( var_0 ) :
          var_3 , var_5 = var_5 , var_3 + var_5
      return var_5
  