class Solution {
public List<List<Integer>> threeSum(int[] nums) {
List<List<Integer>> resultList = new ArrayList<>();
Arrays.sort(nums);
for (int first = 0; first < nums.length; first++) {
int second = first + 1;
int third = nums.length - 1;
while (second < third) {
int temp = nums[second] + nums[third];
if (temp < -nums[first]) {
second++;
} else if (temp > -nums[first]) {
third--;
} else {
int finalFirst = first;
int finalSecond = second;
int finalThird = third;
resultList.add(new ArrayList<Integer>() {
private static final long serialVersionUID = 6096004525464010681L;
{
add(nums[finalFirst]);
add(nums[finalSecond]);
add(nums[finalThird]);
}
});
while (second < third && nums[second] == nums[second + 1]) {
second++;
}
second++;
while (second < third && nums[third] == nums[third - 1]) {
third--;
}
third--;
}
}
while (first < nums.length - 1 && nums[first] == nums[first + 1]) {
first++;
}
}
return resultList;
}
}
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