Cod sursa(job #2277303)

Utilizator adimiclaus15Miclaus Adrian Stefan adimiclaus15 Data 5 noiembrie 2018 23:32:22
Problema Statistici de ordine Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.9 kb
#include <iostream>
#include <fstream>
#include <ctime>
#include <cstdlib>
using namespace std;
ifstream f("sdo.in");
ofstream g("sdo.out");
int n,k,a[3000005];
int partitionare(int st,int dr)
{
    int i,j,pivot;
    swap(a[st+rand()%(dr-st+1)],a[dr]);
    pivot=a[dr];
    j=st-1;
    for(i=st;i<=dr;i++)
    {
        if(a[i]<=pivot)
        {
            j++;
            swap(a[i],a[j]);
        }
    }
    return j;
}
int statistica(int st,int dr)
{
    int poz=partitionare(st,dr);
    if(poz==k)
    {
        return a[k];
    }
    else
    {
        if(poz<k)
        {
            return statistica(poz+1,dr);
        }
        else
        {
            return statistica(st,poz-1);
        }
    }
}
int main()
{
    int i;
    srand(time(NULL));
    f>>n>>k;
    for(i=1;i<=n;i++)
    {
        f>>a[i];
    }
    g<<statistica(1,n);
    return 0;
}