from typing import List
class Solution:
def threeSum(self, nums: List[int]) -> List[List[int]]:
res = []
nums.sort()
for i in range(len(nums)):
l, r = i + 1, len(nums) - 1
if i > 0 and i < len(nums) and nums[i] == nums[i - 1]:
continue
while l < r:
total = nums[i] + nums[l] + nums[r]
if total == 0:
res.append([nums[i], nums[l], nums[r]])
while l < r and nums[l] == nums[l + 1]:
l += 1
while l < r and nums[r] == nums[r - 1]:
r -= 1
l += 1
r -= 1
elif total < 0:
l += 1
elif total > 0:
r -= 1
return res