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17_78_subsets.py
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17_78_subsets.py
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import copy
__author__ = "Wangdu Lin"
__copyright__ = "Copyright 2018, The Algorithm Project"
__credits__ = ["Wangdu Lin, jiuzhang"]
__license__ = "GPL"
__version__ = "1.0.1"
__maintainer__ = "Wangdu Lin"
__email__ = "[email protected]"
__status__ = "Production"
class Solution:
def subsets(self, nums):
"""
:type nums: List[int]
:rtype: List[List[int]]
"""
numsCount = dict()
numsCount[nums[0]] = 1
numsLen = len(nums)
# print(numsLen)
for i in range(1, numsLen):
# print("nums: {}".format(nums[i]))
if not numsCount.get(nums[i]):
numsCount[nums[i]] = 1
else:
numsCount[nums[i]] = numsCount.get(nums[i]) + 1
# print(numsCount)
preCha = 0
sumCha = 1
nexCha = 0
res = []
newSub = []
# print("newSub init len: ", len(newSub))
for key, val in numsCount.items():
# print("key: ", key, ",val: ", val)
preCha = sumCha
sumCha = sumCha * (val + 1)
if preCha == 1:
nexCha = sumCha
else:
nexCha = sumCha - preCha
for i in range(0, nexCha):
if len(res) == i and i == 0:
print("the len of res: ", len(res))
# the first empty change, pass [] to res == [[]]
res.append(newSub)
# newSub.clear()
# print("if len(res) == i and i == 0: res: ", res)
elif len(res) <= i and i != 0:
cpNewSub = []
if len(res) == 1: #which mean res must only have one empty arr == [[]]
cpNewSub.append(key)
res.append(cpNewSub)
else:
cpSub = copy.deepcopy(res[i - 1])
cpSub.append(key)
res.append(cpSub)
# print("elif len(res) <= i and i != 0: res: ", res)
elif len(res) > i and i == 0:
cpSub2 = []
cpSub2.append(key)
res.append(cpSub2)
# print("elif len(res) > i and i == 0: res: ", res)
elif len(res) > i and i != 0:
cpSub3 = copy.deepcopy(res[i])
cpSub3.append(key)
res.append(cpSub3)
# print("elif len(res) > i and i != 0: res: ", res)
return res