如何从列表列表的某些元素之间的组合生成多个列表( java或C)

import java.util.ArrayList;
import java.util.List;

public class ListCombination {
    public static void main(String[] args) {
        List<Integer> inputList = new ArrayList<>();
        inputList.add(1);
        inputList.add(2);
        inputList.add(3);

        List<List<Integer>> result = generateCombinations(inputList);
        for (List<Integer> combination : result) {
            System.out.println(combination);
        }
    }

    public static List<List<Integer>> generateCombinations(List<Integer> inputList) {
        List<List<Integer>> result = new ArrayList<>();
        generateHelper(inputList, new ArrayList<>(), result, 0);
        return result;
    }

    private static void generateHelper(List<Integer> inputList, List<Integer> currentCombination,
                                       List<List<Integer>> result, int start) {
        result.add(new ArrayList<>(currentCombination));

        for (int i = start; i < inputList.size(); i++) {
            currentCombination.add(inputList.get(i));
            generateHelper(inputList, currentCombination, result, i + 1);
            currentCombination.remove(currentCombination.size() - 1);
        }
    }
}