Print all subsets of a set

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I need to write a recursive function that receives a number and print all subgroups from 1 to n. I don't care about the order.

For example if number=3 I need the output:

```{}
{1}
{2}
{3}
{1,2}
{1,3}
{2,3}
{1,2,3}
```

but my code gives:

```{1,2,3}
{2,3}
{3}

```

Here is my code, I call the method `subGroups(3);`

```    public static void subGroups(int num) {
int[] ar = new int[num];
subGroups(ar, 1, num);
}

private static int[] insertToArr(int num, int[] arr) {
if (num == 0)
return arr;
arr[num - 1] = num;
return insertToArr(num - 1, arr);
}

private static void subGroups(int[] arr, int start, int end) {
if (end <= 0 || start > arr.length)
return;
else if (start > end)
subGroups(arr, start, end - 1);
else {
if (start != 0) {
System.out.print("{");

printAll(start, end);
System.out.println("}");
}
subGroups(arr, start + 1, end);
}

}

// prints all in in one line recursive
private static void printAll(int start, int end) {
if (start < end) {
System.out.print(start + ",");
printAll(start + 1, end);
} else {
System.out.print(start);
}

}
```

How do I get the requested result?

This should work, see how this may be ported to arrays.

```import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.IntStream;

import static java.util.Collections.emptySet;
import static java.util.stream.Collectors.toList;

public class Main {
public static void powerset(int n) {
System.out.println(
powerset(IntStream.rangeClosed(1, n).boxed().collect(toList()))
);
}

public static Set<Set<Integer>> powerset(List<Integer> set) {
if (set.isEmpty()) {
Set<Set<Integer>> result = new HashSet();
return result ;
} else {
Integer element = set.remove(0);
Set<Set<Integer>> pSetN_1 = powerset(set);

Set<Set<Integer>> pSet_N= new HashSet();

for (Set<Integer> s : pSetN_1) {
Set<Integer> ss = new HashSet(s);
}
return pSet_N;
}
}

public static void main(String[] args) throws Exception {
powerset(3); // [[], [1], [2], [1, 2], [3], [1, 3], [2, 3], [1, 2, 3]]
}
}
```

By the way, you are calculating a power set, a set of all subsets (not groups) of a set

Finding all subsets of a given set in Java, Finding all subsets of a given set in Java. Last Updated: 31-01-2020. Problem: Find all the subsets of a given set. Input: S = {a, b, c, d} Output: {}, {a} , {b}, {c}, {d}, � In this tutorial, we will learn how to print all the possible subsets of a set in C++. Now, before moving to the problem which is to print all the possible subsets of a set in C++. Let us understand it with an example, where there were 3 sets {0,1,2} (which means n=3).

If `(start > end)` is true, then it will be true of the recursive call `subGroups(arr, start, end-1)` as well, and the recursion will continue along this path until `end` is too small.

So something here needs to change. Consider that nowhere do you ever reset either `start` or `end`.

Backtracking to find all subsets, Given a set of positive integers, find all its subsets. of the array, then print the subset or output array or insert the output array into the vector of� Printing all subsets of {1,2,3,n} without using array or loop; Partition of a set into K subsets with equal sum using BitMask and DP; Count of subsets of integers from 1 to N having no adjacent elements; Count number of ways to partition a set into k subsets; Split a binary string into K subsets minimizing sum of products of occurrences of 0 and 1

A few hints, and a code skeleton below: `arr` should be used as an accumulator for the subset being found. It has initial size=0, and the size is incremented whenever an element is added to the current subset.

The initial call should be:

```int[] arr = new int[0];
subGroups(arr, 1, num);
```

since at this point, you have selected 0 elements and you still need to select a subset of elements `{1,...,num}`.

The function `subGroups` should be:

```/*
* generates all subsets of set {start,...,end} , union "arr"
*/
private static void subGroups(int[] arr, int start, int end) {
//terminal condition: print the array
if (start>end) {
print(arr);
}
else {
//here we have 2 cases: either element "start" is part of the subset, or it isn't

// case 1: "start" is not part of the subset
// so "arr" is unchanged
subGroups(arr, start+1, end);

// case 2: "start" is part of the subset
// TODO: create another array, containing all elements of "arr", and "start"
int[] arrWithStart=copyAndInsert(arr, start);
subGroups(arrWithStart, start+1, end);
}
}

private static void print(int[] arr) {
// TODO code here
}

/*
* copy and insert:
* it should create a new array, with length=arr.length+1,
* containing all elements of array "arr", and also "element"
*/
static int[] copyAndInsert(int[] arr, int element) {
// TODO code here
}
```

Print All Subsets of a given set, Here we are generating every subset using recursion. The total number of subsets of a given set of size n = 2^n. The total number of possible subset a set can have is 2^n, where n is the number of elements in the set. We can generate all possible subset using binary counter. For example: Consider a set 'A' having elements {a, b, c}. So we will generate binary number upto 2^n - 1 (as we will include 0 also).

Print All the Subsets of a Given Set (Power Set), Objective: Given a set of numbers, print all the posssible subsets of it including empty set. Power Set: In mathematics, PowerSet of any given set S, PS(S) is set of� Objective: Given a set of numbers, print all the posssible subsets of it including empty set. Power Set: In mathematics, PowerSet of any given set S, PS(S) is set of all subsets of S including empty set.

Print all distinct subsets of a given set, To print only distinct subsets, we initially sort the subset and exclude all adjacent duplicate elements from the subset along with the current element in case 2. C++ � Print all distinct subsets of a given set. Given a set S, generate all distinct subsets of it i.e., find distinct power set of set S. A power set of any set S is the set of all subsets of S, including the empty set and S itself.

Facebook Coding Interview Question and Answer #1: All Subsets of , Find and print all subsets of a given set! (Given as an array.) Is there any other interview Duration: 10:58 Posted: Oct 2, 2017 Printing all possible subsets of a list it also contains an empty set). It's already been discussed on SO. of all the possible numbers generated by digits of