comefrom: <doocs>2220.Minimum Bit Flips to Convert Number_1.py
code: def minBitFlips( start: int, goal: int) -> int:
      t = start ^ goal
      ans = 0
      while t:
          ans += t & 1
          t >>= 1
      return ans
masked: def sample_funcname ( var_0 : int , var_2 : int ) -> int :
      var_3 = var_0 ^ var_2
      var_5 = 0
      while var_3 :
          var_5 += var_3 & 1
          var_3 >>= 1
      return var_5
  