comefrom: <qiyuangong>018_4Sum_1.py
code: def fourSum( nums, target):
      sort_nums = sorted(nums)
      ls = len(nums)
      res = {}
      pairs = {}
      for i in range(ls - 3):
          for j in range(i + 1, ls - 2):
              res_2 = sort_nums[i] + sort_nums[j]
              try:
                  pairs[target - res_2].append([i, j])
              except KeyError:
                  pairs[target - res_2] = [[i, j]]
      for key, temp in pairs.items():
          for pair in temp:
              j = pair[1] + 1
              k = ls - 1
              while j < k:
                  current = sort_nums[j] + sort_nums[k]
                  if current == key:
                      result = (sort_nums[pair[0]], sort_nums[pair[1]], sort_nums[j], sort_nums[k])
                      res[result] = True
                      j += 1
                  elif current < key:
                      j += 1
                  else:
                      k -= 1
      return res.keys()
masked: def sample_funcname ( var_0 , var_1 ) :
      var_3 = sorted ( var_0 )
      var_5 = len ( var_0 )
      var_6 = { }
      var_7 = { }
      for var_10 in range ( var_5 - 3 ) :
          for var_13 in range ( var_10 + 1 , var_5 - 2 ) :
              var_14 = var_3 [ var_10 ] + var_3 [ var_13 ]
              try :
                  var_7 [ var_1 - var_14 ].append ( [ var_10 , var_13 ] )
              except KeyError :
                  var_7 [ var_1 - var_14 ] = [ [ var_10 , var_13 ] ]
      for var_18 , var_19 in var_7.items ( ) :
          for var_20 in var_19 :
              var_13 = var_20 [ 1 ] + 1
              var_21 = var_5 - 1
              while var_13 < var_21 :
                  var_22 = var_3 [ var_13 ] + var_3 [ var_21 ]
                  if var_22 == var_18 :
                      var_24 = ( var_3 [ var_20 [ 0 ] ] , var_3 [ var_20 [ 1 ] ] , var_3 [ var_13 ] , var_3 [ var_21 ] )
                      var_6 [ var_24 ] = True
                      var_13 += 1
                  elif var_22 < var_18 :
                      var_13 += 1
                  else :
                      var_21 -= 1
      return var_6.keys ( )
  