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ThreeSum.java
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ThreeSum.java
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import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class ThreeSum {
public List<List<Integer>> threeSum(int[] nums) {
List<List<Integer>> res = new ArrayList<List<Integer>>();
if (nums.length < 3) return res;
Arrays.sort(nums);
for (int i = 0; i < nums.length - 2; i++) {
if (i > 0 && nums[i] == nums[i - 1]) continue;
int j = i + 1;
int k = nums.length - 1;
while (j < k) {
int sum = nums[i] + nums[j] + nums[k];
if (sum == 0) {
res.add(Arrays.asList(nums[i], nums[j], nums[k]));
while (j < k && nums[j++] == nums[j]);
while (j < k && nums[k--] == nums[k]);
} else if (sum < 0) {
while (j < k && nums[j++] == nums[j]);
} else {
while (j < k && nums[k--] == nums[k]);
}
}
}
return res;
}
}