#include <bits/stdc++.h>
#define ll long long int
#define mp make_pair
#define pb push_back
#define ld long double
#define pii pair<int,int>
#define sz(x) (int)x.size()
#define piii pair<pii,pii>
#define precise cout<<fixed<<setprecision(10)
#define st first
#define nd second
#define ins insert
#define vi vector<int>
#define BOOST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;
vi find_subset(int l,int u,vi w)
{
vector<pii>tab;
tab.clear();
int licznik=1;
for (auto it:w)tab.pb(mp(it,licznik++));
sort(tab.begin(),tab.end());
int ile=0;
vi ans;
ans.clear();
bool t=false;
for (int i=sz(tab)-1;i>=0;i--)
{
if (ile+tab[i].st<=u)ile+=tab[i].st,ans.pb(tab[i].nd);
if (ile>=l){t=true;break;}
}
if (!t)return {};
return ans;
}
/*
int32_t main()
{
BOOST;
vi rak;
rak=find_subset(15, 17, {6, 8, 8, 7});
cout<<sz(rak)<<"\n";
for (auto it:rak)cout<<it<<" ";
return 0;
}
*/
