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Solution.java
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Solution.java
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public class Solution {
List<List<Integer>> ans=new ArrayList<List<Integer>>();
public List<List<Integer>> threeSum(int[] nums) {
Arrays.sort(nums);
if (nums.length<3) {
return ans;
}
int length=nums.length;
for (int i = 0; i < length-2; i++) {
if (i==0||nums[i]!=nums[i-1]) {
f(nums,nums[i],i+1,length-1);
}
}
return ans;
}
public void f(int[] nums,int target,int s,int e){
while (s<e) {
int res=nums[s]+nums[e]+target;
if (res==0) {
List<Integer> list=new ArrayList<Integer>();
list.add(target);
list.add(nums[s]);
list.add(nums[e]);
ans.add(list);
while (s<e&&nums[s] == nums[s+1]) {
s++;
}
while (s<e&&nums[e] == nums[e-1]) {
e--;
}
s++;
e--;
}else if(res<0) {
s++;
}else {
e--;
}
}
};
}