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ThreeSum.java
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43 lines (39 loc) · 1.14 KB
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package TwoPointers;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/*
15. 3Sum
Time Complexity: O(n^2)
Space: O(N)
*/
public class ThreeSum {
public static List<List<Integer>> threeSum(int[] nums) {
List<List<Integer>> res = new ArrayList<>();
Arrays.sort(nums);
for(int i=0;i<nums.length;i++){
int left = i+1;
int right =nums.length-1;
if(i>0 && nums[i]==nums[i-1]) continue;
else {
while(left<right){
int threeSum =nums[i]+nums[left] + nums[right];
if(threeSum >0){
right--;
}
else if(threeSum <0){
left++;
}
else {
res.add(Arrays.asList(nums[i],nums[left],nums[right]));
left++;
while (left<right && nums[left]==nums[left-1]){
left++;
}
}
}
}
}
return res;
}
}