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public class Solution {

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

List<List<Integer>> result = new ArrayList<List<Integer>>();

Arrays.sort(num);

for (int i = 0; i < num.length-2; i++) {

if (i != 0 && num[i] == num[i-1]) {

continue;

}

int left = i + 1;

int right = num.length - 1;

while (left < right) {

Boolean shrinkRight = false;

Boolean shrinkLeft = false;

int sum = num[i] + num[left] + num[right];

if (sum == 0) {

List<Integer> curr = new ArrayList<Integer>();

curr.add(num[i]);

curr.add(num[left]);

curr.add(num[right]);

result.add(curr);

shrinkLeft = true;

shrinkRight = true;

} else if (sum > 0) {

shrinkRight = true;

} else {

shrinkLeft = true;

}

if (shrinkLeft == true) {

int temp_left = left;

while (left < num.length && num[left] == num[temp_left]) {

left += 1;

}

}

if (shrinkRight == true) {

int temp_right = right;

while (right >= 0 && num[right] == num[temp_right]) {

right -= 1;

}

}

}

}

return result;

}

}