#include <bits/stdc++.h>
using namespace std;
bool f(vector<int>&v, vector<int>&ds,int idx, int sum, int k){
	if(idx>=(int)v.size() || sum==k){
		if(sum==k){
			for(int i=0;i<ds.size();i++)
			cout<<ds[i]<<" ";
			cout<<endl;
			return true;
		}
		return false;
	}
	sum=sum+v[idx];
	ds.push_back(v[idx]);
	bool ans = f(v,ds,idx+1,sum,k);
	if(ans==true)
	return true;
	sum = sum-v[idx];
	ds.pop_back();
	ans = f(v,ds,idx+1,sum,k);
	return ans;
}
int main() {
	vector<int>v= {3,1,2};
	vector<int>ds; int sum=0; int idx=0; int k=6;
	cout<<f(v,ds,idx,sum,k)<<endl;
}

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