二分查找。

#include<cstdio>
#include<cstring>
#include<cmath>
#include<vector>
#include<map>
#include<queue>
#include<stack>
#include<string>
#include<algorithm>
using namespace std; const int maxn=+;
int n;
long long a[maxn],k;
vector<int>ans; bool check(long long m)
{
long long res=;
for(int i=;i<=n;i++) res=res+min(m,a[i]);
if(res>=k) return ;
return ;
} int main()
{
scanf("%d%lld",&n,&k);
for(int i=;i<=n;i++) scanf("%lld",&a[i]);
if(k==)
{
for(int i=;i<=n;i++) printf("%lld ",a[i]);
printf("\n");
return ;
}
long long l=,r=1e9, p=-;
while(l<=r)
{
long long mid=(l+r)/;
if(check(mid)) p=mid,r=mid-;
else l=mid+;
}
if(p==-) printf("-1\n");
else
{
long long sum=;
int pos;
for(int i=;i<=n;i++) sum=sum+min(a[i],p-);
for(int i=;i<=n;i++)
{
if(a[i]>=p) sum++;
if(sum==k) { pos=i; break; }
} for(int i=pos+;i<=n;i++) if(a[i]>=p) ans.push_back(i);
for(int i=;i<=pos;i++) if(a[i]>=p+) ans.push_back(i); for(int i=;i<ans.size();i++) printf("%d ",ans[i]);
printf("\n"); }
return ;
}

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