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ThreeSumZero.java
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ThreeSumZero.java
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public class Solution {
public ArrayList<ArrayList<Integer>> threeSum(ArrayList<Integer> A) {
ArrayList<ArrayList<Integer>> res = new ArrayList<ArrayList<Integer>>();
Collections.sort(A);
for(int i = 0; i <= A.size()-3;i++){
if(i==0 || A.get(i)>A.get(i-1)){
int s = i +1 ; // start
int e = A.size()-1; //end
while(s<e){
if(A.get(i)+ A.get(s) + A.get(e) == 0){
ArrayList<Integer> pair = new ArrayList<>();
pair.add(A.get(i));
pair.add(A.get(s));
pair.add(A.get(e));
res.add(pair);
}
if(A.get(i)+A.get(s) + A.get(e) <0){
//s++;
int cs = s; // current start
while(A.get(s)==A.get(cs) && s<e){
s++;
}
}else{
int ce = e; // current end
while(A.get(e)==A.get(ce) && s<e){
e--;
}
}
}
}
}
return res;
}
}