#include<bits/stdc++.h>
#include "books.h"
using namespace std;
#define all(fl) fl.begin(),fl.end()
#define pb push_back
#define fi first
#define se second
#define for1(i,j,k) for(int i=j;i<=k;i++)
#define for2(i,j,k) for(int i=j;i>=k;i--)
#define for3(i,j,k,l) for(int i=j;i<=k;i+=l)
#define lb lower_bound
#define ub upper_bound
#define sz(a) (int)a.size()
#define pii pair<int,int>
#define pli pair<long long,int>
#define gcd __gcd
#define lcm(x,y) x*y/__gcd(x,y)
/*
typedef long long ll;
void __attribute__((noreturn)) __attribute__((format(printf, 1, 2))) result(const char *msg, ...)
{
va_list args;
va_start(args, msg);
vfprintf(stderr, msg, args);
fprintf(stderr, "\n");
va_end(args);
exit(0);
}
namespace
{
int N, K, S, sUsed;
long long A;
vector<long long> seq;
}
void impossible()
{
result("Impossible (not checked): %d book(s) skimmed", sUsed);
exit(0);
}
long long skim(int pos)
{
printf("skim(%d): ", pos);
if (pos<1 || pos>N) result("Invalid skim");
printf("%lld\n", seq[pos]);
sUsed++;
if (sUsed>S) result("Out of books to skim");
return seq[pos];
}
void answer(vector<int> v)
{
printf("answer({");
for(int i = 0; i < (int) v.size(); ++i)
{
printf("%d", v[i]);
if(i + 1 != (int) v.size()) printf(", ");
}
printf("})\n");
if ((int) v.size() != K) result("Invalid answer");
ll sum = 0;
for(auto x: v) {
if (x<1 || x>N) result("Invalid answer");
sum += seq[x];
}
if (sum < A || 2*A<sum) result("Wrong answer");
result("Correct: %d book(s) skimmed", sUsed);
exit(0);
}
*/
void solve(int n,int k,long long A,int s){
long long vcl=(A+k-1)/k;
long long vl=-1;
int l=1,r=n,ans=-1;
while (l<=r){
int mid=(l+r)/2;
long long d=skim(mid);
if (d>=vcl){
ans=mid;
vl=d;
r=mid-1;
}
else l=mid+1;
}
if (ans==-1){
impossible();
return ;
}
vector<pli>a;
a.pb({vl,ans});
for1(i,ans+1,min(n,ans+k-1)){
a.pb({skim(i),i});
}
for1(i,ans-1,max(1,ans-k+1)){
a.pb({skim(i),i});
}
int m=sz(a);
for1(i,0,(1<<m)-1){
if (__builtin_popcount(i)!=k)continue;
long long s=0;
for1(j,0,m-1){
if (i>>j&1){
s+=a[j].fi;
}
}
if (s>=A&&s<=2*A){
vector<int>id;
for1(j,0,m-1){
if (i>>j&1)id.pb(a[j].se);
}
answer(id);
return;
}
}
impossible();
}
/*signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
//freopen(".INP","r",stdin);
//freopen(".OUT","w",stdout);
if(scanf("%d %d %lld %d", &N, &K, &A, &S) != 4)
result("Invalid input");
seq.resize(N + 1);
for(int i = 1; i <= N; ++i) {
if(scanf("%lld", &(seq[i])) != 1) result("Invalid input");
if(i>1 && seq[i]<=seq[i-1]) result("Invalid input");
}
solve(N, K, A, S);
result("No answer");
}*/
