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public class ID15三数之和 {
public static List<List<Integer>> threeSum(int[] nums) {
List<List<Integer>> res = new ArrayList<>();
Arrays.sort(nums);
for (int i = 0; i < nums.length-2; i++) {
if(i>0&&nums[i]==nums[i-1])continue;
int l=i+1;
int r=nums.length-1;
while (l<r)
{
int sum = nums[i] + nums[l] + nums[r];
if(sum==0) {
res.add(Arrays.asList(nums[i], nums[l], nums[r]));
while (l < r && nums[l] == nums[l + 1]) l++;
while (l < r && nums[r] == nums[r - 1]) r--;
l++;
r--;
}
else if (sum<0) l++;
else r--;
}
}
return res;
}
public static void main(String[] args) {
List<List<Integer>> lists = threeSum(new int[]{0, 0, 0,0
});
System.out.println("lists = " + lists);
}
}
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