comefrom: <qiyuangong>070_Climbing_Stairs_2.py
code: def climbStairs( n):
      if n <= 1:
          return 1
      dp = [1] * 2
      for i in range(2, n + 1):
          dp[1], dp[0] = dp[1] + dp[0], dp[1]
      return dp[1]
masked: def sample_funcname ( var_0 ) :
      if var_0 <= 1 :
          return 1
      var_3 = [ 1 ] * 2
      for var_5 in range ( 2 , var_0 + 1 ) :
          var_3 [ 1 ] , var_3 [ 0 ] = var_3 [ 1 ] + var_3 [ 0 ] , var_3 [ 1 ]
      return var_3 [ 1 ]
  