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Copy pathThreeSum.java
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ThreeSum.java
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import java.util.*;
public class ThreeSum {
public List<List<Integer>> threeSum(int[] nums) {
List<List<Integer>> result = new ArrayList<>();
Arrays.sort(nums);
for (int i = 0; i < nums.length - 2; i++) {
if (i == 0 || (i > 0 && nums[i] != nums[i - 1])) {
int left = i + 1, right = nums.length - 1, target = -nums[i];
while (left < right) {
if (nums[left] + nums[right] == target) {
result.add(Arrays.asList(nums[i], nums[left], nums[right]));
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) {
left++;
} else {
right--;
}
}
}
}
return result;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter the number of elements in the array:");
int n = scanner.nextInt();
int[] nums = new int[n];
System.out.println("Enter the elements of the array:");
for (int i = 0; i < n; i++) {
nums[i] = scanner.nextInt();
}
ThreeSum solution = new ThreeSum();
List<List<Integer>> triplets = solution.threeSum(nums);
System.out.println("Triplets that sum up to 0:");
for (List<Integer> triplet : triplets) {
System.out.println(triplet);
}
}
}