Cod sursa(job #1576138)

Utilizator radiogard1999Dragoi Andrei radiogard1999 Data 22 ianuarie 2016 09:43:20
Problema Statistici de ordine Scor 90
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>

using namespace std;
ifstream fin("sdo.in");
ofstream fout("sdo.out");

int n,k,v[3000005];

void Citire()
{
    int i;
    fin>>n>>k;
    for(i=1;i<=n;i++)
        fin>>v[i];
    fin.close();
}

int Pivot(int st,int dr)
{
    int piv,x=st;
    piv=v[st];
    st++;
    while(st<=dr)
    {
        if(v[st]<=piv) st++;
        if(piv<v[dr]) dr--;
        if(v[st]>piv&&piv>=v[dr]&&st<dr)
        {
            swap(v[st],v[dr]);
            st++;
            dr--;
        }
    }
    swap(v[x],v[st-1]);
    return st-1;
}

int Elem(int st,int dr)
{
    int poz;
    if(st==dr) return v[st];
    poz=Pivot(st,dr);
    if(poz==k) return v[poz];
    if(poz>k) return Elem(st,poz-1);
    return Elem(poz+1,dr);
}

int main()
{
    int p;
    Citire();
    p=Elem(1,n);
    fout<<p<<"\n";
    fout.close();
    return 0;
}