#include <bits/stdc++.h>
#include "books.h"
using namespace std;
typedef long long ll;
void solve(int n, int k, ll s, int c) {
vector < int > ans, pos;
ll a[n + 1], cur = 0;
for(int i = 1; i <= n; i++) a[i] = skim(i);
for(int i = 1; i <= n; i++){
if(s <= a[i] && a[i] <= 2 * s){
answer({i}); return;
}
}
for(int i = n; i >= 1; i--)
if(a[i] < s && pos.size() < k)
pos.push_back(i);
if(pos.size() < k) { impossible(); return; }
for(int i = 1; i < pos[k - 1] && i <= k; i++)
pos.push_back(i);
for(int msk = 0; msk < (1 << (int)pos.size()); msk++){
if(__builtin_popcount(msk) != k) continue;
for(int i = 0; i < pos.size(); i++)
if((msk >> i & 1))
cur += a[pos[i]], ans.push_back(pos[i]);
if(s <= cur && cur <= 2 * s){ answer(ans); return; }
cur = 0, ans.clear();
}
impossible();
}
