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3Sum.java
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3Sum.java
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class 3Sum {
public List<List<Integer>> threeSum(int[] nums) {
LinkedList<List<Integer>> output = new LinkedList<List<Integer>>();
Arrays.sort(nums);
for (int i = 0; i < nums.length - 2; i++) {
if (i == 0 || (i > 0 && nums[i - 1] != nums[i])) {
int target = 0 - nums[i];
int left = i + 1;
int right = nums.length - 1;
while (left < right) {
if (nums[left] + nums[right] == target) {
ArrayList<Integer> temp = new ArrayList<Integer>();
temp.add(nums[i]);
temp.add(nums[left]);
temp.add(nums[right]);
output.add(temp);
while (left < right && nums[left] == nums[left + 1]) {
left++;
}
while (left < right && nums[right] == nums[right - 1]) {
right--;
}
left++;
right--;
} else if (nums[left] + nums[right] > target) {
right--;
} else {
left++;
}
}
}
}
return output;
}
}