leetcode 3Sum

题目链接

public class Solution {
    public   List<List<Integer>> result = new LinkedList<List<Integer>>();  


    public   List<List<Integer>> threeSum(int[] nums) {



        Arrays.sort(nums);
        int last=Integer.MAX_VALUE;
        for(int i=0;i<nums.length&&nums[i]<=0;i++)
        {
            if(last==nums[i])
            {
                continue;
            }
            last=nums[i];
            fun(nums,0-nums[i],i+1,nums.length-1);

        }


        return result;
    }

    public void fun(int[] nums,int target,int start,int end)
    {
    int lastStart=Integer.MAX_VALUE;
        int lastEnd=Integer.MAX_VALUE;

        while(start<end)
        {


            lastStart=nums[start];
            lastEnd=nums[end];
            if(nums[start]+nums[end]==target)
            {
                LinkedList<Integer> temp=new LinkedList<Integer>();
                temp.add(0-target);
                temp.add(nums[start]);
                temp.add(nums[end]);
                result.add(temp);
                while(start<end&&nums[start]==nums[start+1])
                {
                    start++;
                }
                while(start<end&&nums[end-1]==nums[end])
                {
                    end--;
                }
                start++;
                end--;
            }
            else if(nums[start]+nums[end]<target)
            {
                start++;

            }
            else
            {
                end--;

            }
        }


    }
}

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