comefrom: <doocs>2110.Number of Smooth Descent Periods of a Stock_1.py
code: def getDescentPeriods( prices: List[int]) -> int:
      i, n = 0, len(prices)
      ans = 0
      while i < n:
          j = i
          while j + 1 < n and prices[j] - prices[j + 1] == 1:
              j += 1
          t = j - i + 1
          ans += t * (t + 1) // 2
          i = j + 1
      return ans
masked: def sample_funcname ( var_0 : List [ int ] ) -> int :
      var_4 , var_6 = 0 , len ( var_0 )
      var_7 = 0
      while var_4 < var_6 :
          var_8 = var_4
          while var_8 + 1 < var_6 and var_0 [ var_8 ] - var_0 [ var_8 + 1 ] == 1 :
              var_8 += 1
          var_10 = var_8 - var_4 + 1
          var_7 += var_10 * ( var_10 + 1 ) // 2
          var_4 = var_8 + 1
      return var_7
  