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import java.util.*; public class ThreeSum { public static List<List<Integer>> threeSum(int[] nums) { List<List<Integer>> result = new ArrayList<>(); Arrays.sort(nums); // Step 1: Sort the array for (int i = 0; i < nums.length - 2; i++) { // Avoid duplicates for the fixed number if (i > 0 && nums[i] == nums[i - 1]) continue; int target = -nums[i]; int left = i + 1, right = nums.length - 1; while (left < right) { int sum = nums[left] + nums[right]; if (sum == target) { result.add(Arrays.asList(nums[i], nums[left], nums[right])); left++; right--; // Skip duplicates for the left and right pointers while (left < right && nums[left] == nums[left - 1]) left++; while (left < right && nums[right] == nums[right + 1]) right--; } else if (sum < target) { left++; } else { right--; } } } return result; } public static void main(String[] args) { int[] nums = {-1, 0, 1, 2, -1, -4}; System.out.println(threeSum(nums)); } }
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