#include <iostream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <numeric>
#include <cstring>
#include <string>
#include <cmath>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
using namespace std;
#define ll long long
#define ull unsigned long long
#define f first
#define s second
#define PF push_front
#define PB push_back
#define MP make_pair
#define max(a, b) ((a > b)? a : b)
#define min(a, b) ((a < b)? a : b)
#define max3(a, b, c) max(max(a, b), c)
#define min3(a, b, c) min(min(a, b), c)
const int N = 2e5 + 5;
const int M = 1e9 + 7;
const int inf = 0x3f3f3f3f;
const ll int INF = 1e18;
vector<int> find_subset(int l, int u, vector<int> w){
int n = w.size();
vector<pair<int, int>> v;
for(int i = 0; i < n; i++){
v.PB(MP(w[i], i));
}
sort(w.begin(), w.end());
ll int pre = 0, suf = 0, sz = -1;
for(int i = 0; i < n; i++){
pre += v[i].f;
suf += v[n-i-1].f;
if(pre <= u && suf >= l){
sz = i;
break;
}
}
vector<int> ans;
if(sz == -1) return ans;
pre = suf = 0;
for(int i = 0; i <= sz; i++){
pre += v[i].f;
}
for(int i = 0; i <= sz; i++){
if(pre + suf >= l && pre + suf <= u) break;
pre -= v[sz-i].f;
suf += v[n-i-1].f;
}
for(ll int i = 0, temp = 0; temp < pre; temp += v[i].f, i++) ans.PB(v[i].s);
for(ll int i = 0, temp = 0; temp < suf; temp += v[n-i-1].f, i++) ans.PB(v[n-i-1].s);
return ans;
}
// int main(){
// ios::sync_with_stdio(false);
// cin.tie(NULL);
// // ifstream cin();
// // ofstream cout();
// vector<int> temp;
// // temp = find_subset(15, 17, {6, 8, 8, 7});
// // temp = find_subset(14, 15, {5, 5, 6, 6});
// // temp = find_subset(10, 20, {15, 17, 16, 18});
// for(int i : temp){
// cout << i << ' ';
// }
// }
