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ThreeSum.java
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ThreeSum.java
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package src.java.medium.array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
class Solution {
public List<List<Integer>> threeSum(int[] nums) {
List<List<Integer>> ret = new ArrayList<>();
if (nums==null || nums.length<3) return ret;
Arrays.sort(nums);
for(int i=0; i<nums.length-2; i++){
if (i>0 && nums[i]==nums[i-1]) continue;
int temp = 0-nums[i];
int j=i+1, k=nums.length-1;
while(j<k){
int n = nums[j]+nums[k];
if (n>temp) k--;
else if(n<temp) j++;
else{
ret.add(Arrays.asList(nums[i], nums[j++], nums[k--]));
while (nums[j-1]==nums[j]&&j<k)
j++;
while (nums[k+1]==nums[k]&&j<k)
k--;
}
}
}
return ret;
}
}