#include <bits/stdc++.h>
#include "books.h"
using namespace std;
using ll = long long;
//
// --- Sample implementation for the task books ---
//
// To compile this program with the sample grader, place:
// books.h books_sample.cpp sample_grader.cpp
// in a single folder and run:
// g++ books_sample.cpp sample_grader.cpp
// in this folder.
//
void solve(int N, int K, ll A, int S) {
vector <int> ans;
ll sum = 0;
int lo = 1, hi = N+1;
while (lo < hi && (int)ans.size() < K) {
int mid = (lo + hi) / 2;
ll x = skim(mid);
if (sum + x <= 2*A) {
sum += x;
ans.push_back(mid);
if (sum < A)
lo = mid;
else
hi = mid;
} else
hi = mid;
}
if (sum < A || (int)ans.size() != K || sum > 2*A)
impossible();
answer(ans);
}
// int main() {
// int n, k, a, s;
// cin >> n >> k >> a >> s;
// vector <int> nums(n+1);
// for (int i = 1; i <= n; i++)
// cin >> nums[i];
// auto res = solve(n, k, a, s);
// }
