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ThreeSum.py
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ThreeSum.py
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"""
Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.
Note:
The solution set must not contain duplicate triplets.
Example:
Given array nums = [-1, 0, 1, 2, -1, -4],
A solution set is:
[
[-1, 0, 1],
[-1, -1, 2]
]
3sum。
a + b + c = 0.
1. 第一次尝试首先是减去一个数，然后剩下的用twoSum的二分法做判断进行查找，结果非常慢。
TLE.
2. 学习了一波 O(n) 的算法:
start->+ -<-end
当等于之后，还有可能存在同样会相等的数：
我们预先去重了，所以是唯一的，start和end同时朝着各自的方向进1就可以。
然后就是去重问题：
在非0的情况下，如果下标多于等于2个，则判断-2*A 是否在里面。
在0的情况下，多于等于3个才可以。
beat 94%
测试链接：
https://leetcode.com/problems/3sum/description/
"""
class Solution(object):
def threeSum(self, nums):
"""
:type nums: List[int]
:rtype: List[List[int]]
"""
sortedNums = nums
result = []
index_dict = {}
for i, d in enumerate(sortedNums):
try:
index_dict[d].append(i)
except KeyError:
index_dict[d] = [i]
sortedNums = sorted(set(sortedNums))
length = len(sortedNums) - 1
result = []
for i, data in enumerate(sortedNums):
if data > 0:
break
target = 0 - data
start = i + 1
end = length
while start < end:
if sortedNums[start] + sortedNums[end] == target:
# print(target)
result.append(sorted((sortedNums[start], sortedNums[end], data)))
# break
end -= 1
start += 1
continue
if sortedNums[start] + sortedNums[end] > target:
end -= 1
else:
start += 1
for i in index_dict:
if i == 0:
if len(index_dict.get(i)) >= 3:
result.append([0, 0, 0])
continue
if len(index_dict.get(i)) >= 2 and i != 0:
if index_dict.get(-2*i):
result.append(sorted((i,i,-2*i)))
return result
# for j in range(i+1, length):
# pass
# target = j - data
# (data, sortedNums[j], target-sortedNums[j])
# x = self.binarySearch(sortedNums, target, j+1)
# if x:
# result.append(sorted((data, sortedNums[j], target-sortedNums[j])))
# length = len(sortedNums)
# data2 = sortedNums[j]
# if index_dict.get(target-data2):
# if data == target-data2:
# index_dict.get(data)[-1] >= j:
# result.append(sorted((data, data2, target-data2)))
# def twoSum(self, ranges, nums, target):
# print(target)
"""
:type nums: List[int]
:type target: int
:rtype: List[int]
"""
# indexmap = dict()
# num1index = 0
# for num0 in ranges:
# num2index = None
# num2index
# for num0 in ranges:
# num1 = nums[num0]
# num2index = indexmap.get(target-num1)
# if (
# (num2index is not None) and
# (num2index != num1index)
# ):
# break
# else:
# indexmap[num1] = num1index
# num1index = num1index + 1
# result = [num2index, num1index]
# # print(result)
# if all(result):
# return result
# return False
# for j, data2 in enumerate(sortedNums):
# a = sorted((data, data2, target-data2))
# if len(set(a)) != 3:
# if len(index_dict.get(target-data2)) >= 2:
# if a not in result:
# result.append(a)
# else:
# if a not in result:
# print((data, data2, target-data2))
# for x in (data, data2, target-data2):
# temp = index_dict.get(x)
# if not temp:
# break
# temp.pop()
# if not temp:
# index_dict.pop(x)
# else:
# if len(set((data, data2, target-data2))) == 2:
# result.append(sorted((data, data2, target-data2)))
# else:
# sortedNums[i+1:]
# if self.binarySearch(sortedNums[i+1:][j+1:], target-data2):
# if (data, data2, target-data2) not in result:
return result
a = 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# a = sorted([-1, 0, 1, 2, -1, -4, -1])
# a = [3,0,-2,-1,1,2]
[-2, -1, 0, 1, 2, 3]
# a = [0,0,0,0]
# a = [-1,0,1]
s = Solution()
# print(len(a))
print(s.threeSum(a))