#include <bits/stdc++.h>
using namespace std;
#ifdef DEBUG
#include "../Library/debug.h"
#else
#define dbg(x...)
#endif
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define F0R(i, a) for (int i = 0; i < (a); ++i)
#define FORd(i, a, b) for (int i = (b) - 1; i >= (a); --i)
#define F0Rd(i, a) for (int i = (a) - 1; i >= 0; --i)
#define trav(a, x) for (auto& a : x)
#define f first
#define s second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) x.begin(), x.end()
const char nl = '\n';
const int INF = 1e9;
const int MOD = 998244353;
#include "molecules.h"
vi find_subset(int u, int l, vi a){
int n = sz(a);
int sum = 0;
sort(all(a));
for(int i = 0, j = 0; i < n; ++i){
sum += a[i];
while(sum > l)
sum -= a[j++];
if(sum >= u && sum <= l){
vi ans;
FOR(k, j, i + 1)
ans.pb(k);
return ans;
}
}
vi ans;
return ans;
};
