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15_3Sum.py
114 lines (98 loc) · 21.9 KB
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15_3Sum.py
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from typing import List
class Solution:
def threeSum(self, nums: List[int]) -> List[List[int]]:
nums.sort()
output = list()
last_1 = None
for i_1, num_1 in enumerate(nums[:-2]):
if num_1 == last_1:
continue
i_l = i_1 + 1
i_r = len(nums) - 1
while i_l < i_r:
three_sum = num_1 + nums[i_l] + nums[i_r]
if three_sum < 0:
i_l += 1
elif three_sum > 0:
i_r -= 1
else:
output.append([num_1, nums[i_l], nums[i_r]])
i_l += 1
while nums[i_l] == nums[i_l - 1] and i_l < i_r:
i_l += 1
last_1 = num_1
return output
"""
class Solution:
def threeSum(self, nums: List[int]) -> List[List[int]]:
nums.sort()
output = list()
last_1 = None
for i_1, num_1 in enumerate(nums[:-2]):
if num_1 == last_1:
continue
i_l = i_1 + 1
i_r = len(nums) - 1
while i_l < i_r:
three_sum = num_1 + nums[i_l] + nums[i_r]
if three_sum < 0:
i_l = move_index(nums, i_l, 1, i_r)
elif three_sum > 0:
i_r = move_index(nums, i_r, -1, i_l)
else:
output.append([num_1, nums[i_l], nums[i_r]])
i_l_old = i_l
i_l = move_index(nums, i_l, 1, i_r)
i_r = move_index(nums, i_r, -1, i_l_old)
last_1 = num_1
return output
def move_index(nums, i, delta, i_ref):
last_i = nums[i]
i += delta
while last_i == nums[i] and i != i_ref:
i += delta
return i
"""
"""
class Solution:
def threeSum(self, nums: List[int]) -> List[List[int]]:
nums.sort()
output = list()
last_1 = None
for i_1 in range(0, len(nums) - 2):
num_1 = nums[i_1]
if num_1 == last_1:
continue
last_1 = num_1
last_2 = None
for i_2 in range(i_1 + 1, len(nums) - 1):
num_2 = nums[i_2]
if num_2 == last_2:
continue
last_2 = num_2
num_3 = binary_search(nums[i_2 + 1:], -(num_1 + num_2))
if num_3 is not None:
output.append([num_1, num_2, num_3])
return output
def binary_search(nums, value):
low = 0
high = len(nums) - 1
while low <= high:
mid = (high + low) // 2
if nums[mid] < value:
low = mid + 1
elif nums[mid] > value:
high = mid - 1
else:
return nums[mid]
return None
"""
# print(binary_search([1,5,9,10], 9))
# print(binary_search([1], 9))
# print(binary_search([], 9))
input_list = [-1,0,1,2,-1,-4]
print(Solution().threeSum(input_list))
input_list = 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print(Solution().threeSum(input_list))
input_list = [0,0,0]
print(Solution().threeSum(input_list))