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3sum-zero.py
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3sum-zero.py
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#
# 应该是要求三个数相加 等于 0, 找出所有可能的匹配项。
#
def stre(n1, n2, n3):
return str(n1) + ' ' + str(n2) + ' ' + str(n3)
def threeSum(nums):
p_list = [] # positive list
p_dict = {}
n_list = [] # negative list
n_dict = {}
z_list = [] # zero list
results_list = [] # store results, sort needed to compare if result is unique.
results_map = {} # if find one, sort it and store the sequences in the map
if not nums:
return []
for n in nums:
if n > 0:
p_list.append(n)
if n not in p_dict:
p_dict[n] = 1
else:
p_dict[n] += 1
elif n < 0:
n_list.append(n)
if n not in n_dict:
n_dict[n] = 1
else:
n_dict[n] += 1
else:
z_list.append(n)
if len(z_list) > 2:
results_list.append([0,0,0])
for p, p_value in enumerate(p_list):
for n, n_value in enumerate(n_list):
target_num = -(p_value + n_value)
new_result = None
if target_num > 0:
if target_num in p_dict:
if target_num == p_value and p_dict[target_num] < 2:
continue
new_result = stre(p_value, target_num, n_value) if p_value > target_num else stre(target_num, p_value, n_value)
elif target_num < 0:
if target_num in n_dict:
if target_num == n_value and n_dict[target_num] < 2:
continue
new_result = stre(p_value, target_num, n_value) if target_num > n_value else stre(p_value, n_value, target_num)
else:
if len(z_list) > 0:
new_result = stre(p_value, 0, n_value)
if new_result and new_result not in results_map:
results_list.append(new_result)
results_map[new_result] = 1
return list(map(lambda result: [int(num) for num in result.split(' ')], results_list))
sample = 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print(threeSum(sample))
print(len(sample))