Cod sursa(job #760580)

Utilizator Theorytheo .c Theory Data 22 iunie 2012 01:01:50
Problema Statistici de ordine Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include<fstream>
#include<algorithm>
using namespace std;
ifstream fin("sdo.in");
ofstream fout("sdo.out");
const int nmax = 10000;
int v[nmax], k, N;

int qsort(int p, int q, int k)
{
    int piv = rand() % (q - p + 1) + p ;

    swap(v[piv], v[p]);

    int x = v[p];
    int st = p, dr = q;
    while(st<dr)
    {
        for( ; st< dr && x <= v[dr]; --dr) ;
            v[st] = v[dr] ;
        for( ; st <dr && x >= v[st]; ++st) ;
            v[dr] = v[st];

    }
    v[st] = x;

    int pozpiv = st;
    int le = pozpiv - p + 1;
    if( le > k)
        qsort(p , pozpiv - 1, k);
    if(le < k)
        qsort(pozpiv + 1, q, k - le);

}
void read()
{
    fin >>N>>k;
    for(int i = 1; i <= N; i++)
        fin>>v[i];
        //fout<<rand() + 1 <<'\n';
    qsort(1,N, k);
}
int main()
{
    read();
    fout <<v[k] ;
    fin.close();
    return 0;
}