#include<bits/stdc++.h>

using namespace std;

void help(vector<int> &arr,int &count,int sum,int target,int index,vector<vector<int>> &res,vector<int> &res1){

if(sum==target){

res.push_back(res1);

count++;

return ;

}

else if(sum>target || index==int(arr.size())) return ;

for (int i=index;i<int(arr.size());i++){

res1.push_back(arr[i]);

help(arr,count,sum+arr[i],target,i,res,res1);

res1.pop_back();

}

}

int main(){

vector<int> arr={2,2,3,7};

int count=0;

vector<vector<int>> res;

vector<int> res1;

help(arr,count,0,7,0,res,res1);

set<vector<int>> set1;

for (auto it:res){

set1.insert(it);

}

for (auto it=set1.begin();it!=set1.end();it++){

for (auto it1:(*it)){

cout<<it1<<" ";

}

cout<<endl;

}

// cout<<count<<endl;

}