Created
March 24, 2021 13:36
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public class Solution { | |
public ArrayList<ArrayList<Integer>> threeSum(ArrayList<Integer> A) { | |
Collections.sort(A); | |
HashSet<ArrayList<Integer>> hs = new LinkedHashSet<>(); | |
int n = A.size(); | |
for(int i=0;i<n-2;i++){ | |
int v = A.get(i); | |
int j = i+1; | |
int k = n-1; | |
while(j<k){ | |
long v1 = A.get(j); | |
long v2 = A.get(k); | |
long sum = v1+v2+v; | |
if(sum == 0){ | |
ArrayList<Integer> l = new ArrayList<>(); | |
l.add(A.get(i)); | |
l.add((int)v1); | |
l.add((int)v2); | |
hs.add(l); | |
j++; | |
k--; | |
}else if(sum<0){ | |
j++; | |
}else{ | |
k--; | |
} | |
} | |
} | |
return new ArrayList<ArrayList<Integer>>(hs); | |
} | |
} |
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