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ThreeSum.java
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ThreeSum.java
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class ThreeSum {
public 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 left = i + 1;
int right = nums.length - 1;
while (left < right) {
int tmp = nums[left] + nums[right];
if (tmp + nums[i] == 0) {
res.add(Arrays.asList(nums[i], nums[left], nums[right]));
left++;
right--;
while (left < right && nums[left] == nums[left - 1]) {
left++;
}
} else if (tmp + nums[i] < 0) {
left++;
} else {
right--;
}
}
}
return res;
}
}