6.12

class Solution(object):
    def threeSum(self, nums):
        res_list=[]
        nums.sort()
        for i in  range(len(nums)):
            if(nums[i]>0):
                break

            if i>0 and nums[i]==nums[i-1]:
                continue
            j=i+1
            k=len(nums)-1
            while j<k:
                if(nums[j]+nums[k]==-nums[i]):
                    res_list.append([nums[i],nums[j],nums[k]])
                    while j < k and nums[j] == nums[j + 1]:
                        j=j+1
                    while j < k and nums[k] == nums[k - 1]:
                        k=k-1
                    j=j+1
                    k=k-1
                elif nums[j] + nums[k] < -nums[i]: j =j+1
                else: k=k-1
        return res_list