ksir

#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("ksir.in");
ofstream g("ksir.out");
char s[200000];
int k,x;

int main()
{
    f.getline(s,200000);
    string str(s);
    sort(str.begin(),str.end());
    f>>k;
    int start,stop;
    unsigned lungime=str.length(),s,p;
    while(k)
    {
        f>>x;
        start=0;
        p=lungime;
        s=0;
        while(s<x)
        {
            s+=p;
            --p;
            start++;
        }
        --start;
        stop=x-s+p+1;
        for(int j=start;j<start+stop&&str[j]!='\0';++j)
            g<<str[j];
        g<<'\n';
        --k;
    }
    return 0;
}