腾讯五十题 No.9

题目链接

刚开始感觉哇这代码好长，还总写漏，但是写了几遍后感觉好了很多

class Solution {
    public List<List<Integer>> threeSum(int[] nums) {
        List<List<Integer>> result = new ArrayList<>();
        //先排序
        Arrays.sort(nums);

        //开始遍历
        for (int i = 0; i < nums.length; i++) {
            if (nums[i] > 0) {
                return result;
            }
            //nums[i]去重
            if (i > 0 && nums[i] == nums[i - 1]) {
                continue;
            }

            //左右指针
            int left = i + 1;
            int right = nums.length - 1;
            while (right > left) {
                int sum = nums[i] + nums[left] + nums[right];
                if (sum > 0) {
                    right--;
                } else if (sum < 0) {
                    left++;
                } else {
                    result.add(Arrays.asList(nums[i], nums[left], nums[right]));
                    //元素去重
                    while (right > left && nums[right] == nums[right - 1]) right--;
                    while (right > left && nums[left] == nums[left + 1]) left++;
                    
                    //每轮移动左右指针
                    right--; 
                    left++;
                }
            }
        }
        return result;
    }
}

标签：right,nums,int,++,result,腾讯,五十,No.9,left
来源： https://www.cnblogs.com/jianjiana/p/15864854.html