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public list integer four sum(int[]nums,int target) {

ListListInteger ans=new ArrayListListInteger();

if(nums==null || nums.length==0)返回美国国家标准(American National Standards的缩写)

list integer list=new ArrayList();



返回美国国家标准(American National Standards的缩写)


private void getSum(int[] nums,int sum,int target,ListListInteger ans,ListInteger list,int pos){

if(list.size()==4 sum==target!答案包含(列表)){

ans。add(new ArrayList(list));返回;

}else if(list.size()==4)返回;

for(int I=pos;i nums.lengthi)




getSum(nums,sum nums,target,ans,list,I 1);




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