#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int, int> pi;
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define pop_front(v) v.erase(v.begin())
#define REP(i, a, b) for (int i=a; i<=b; i++)
#define REPn(i, a, b) for (int i=a; i>=b; i--)
#define FOR(i, n) REP(i, 0, n-1)
#define FORn(j, n) REPn(j, n-1, 0)
#define all(v) (v).begin(), (v).end()
#define allR(v) (v).rbegin(), (v).rend()
vi find_subset(int l, int u, vi w) {
int n=w.size();
vector<pi> v(n);
FOR(i,n) v[i]={w[i],i};
sort(all(v));
int i=0,j=0; ll sum=v[0].F;
while (!(sum<=u&&sum>=l)) {
if (sum>u) {
if (i>=n-1) return {};
sum-=v[i].F; i++;
}
if (sum<u) {
if (j>=n-1) return {};
j++; sum+=v[j].F;
}
}
vi ans={};
REP(kk, i, j) {
ans.PB(v[kk].S);
}
return ans;
}
