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Main.java
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Main.java
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package com.company;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class Main {
public static void main(String[] args) {
int[] nums = {1, 2, 2};
System.out.println(subsetsWithDup(nums));
}
public static List<List<Integer>> subsetsWithDup(int[] nums) {
Arrays.sort(nums);
List<List<Integer>> res = new ArrayList<>();
dfs(nums, 0, new ArrayList<>(), res);
return res;
}
public static void dfs(int[] nums, int start, List<Integer> item, List<List<Integer>> res){
res.add(new ArrayList<>(item));
for (int i = start; i < nums.length; i++) {
if(i > start && nums[i] == nums[i - 1]) continue;
item.add(nums[i]);
dfs(nums, i + 1, item, res);
item.remove(item.size() - 1);
}
}
}