Cod sursa(job #1744416)

Utilizator Dan_RadulescuRadulescu Dan Dan_Radulescu Data 19 august 2016 19:05:17
Problema Statistici de ordine Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include<fstream>
#include<stdlib.h>
using namespace std;
ifstream fin("sdo.in");
ofstream fout("sdo.out");
int n,v[3000005],i,j,k;
int pos(int st,int dr){
    int i,j,val,aux;
    val=v[st+(rand()%(dr-st+1))];
    i=st-1;j=dr+1;
    while(0<1){
        do{
            i++;
        }while(v[i]<val);
        do{
            j--;
        }while(v[j]>val);
        if (i<j){
            aux=v[i];
            v[i]=v[j];
            v[j]=aux;
        }
          else
            return j;
    }
}
int sord(int st,int dr,int poz){
    int q,pivot;
    if (st==dr) return v[st];
    pivot=pos(st,dr);
    q=pivot-st+1;
    if (q>=poz) return sord(st,pivot,poz);
      else
        return sord(pivot+1,dr,poz-q);
}
int main(){
    fin>>n>>k;
    for (i=1;i<=n;i++)
        fin>>v[i];
    fin.close();
    fout<<sord(1,n,k);
    fout.close();
    return 0;
}