Cod sursa(job #1281571)

Utilizator ovidiuz98Zamfir Ovidiu ovidiuz98 Data 3 decembrie 2014 13:15:35
Problema Sortare prin comparare Scor 60
Compilator cpp Status done
Runda Arhiva educationala Marime 0.74 kb
#include <fstream>
#include <ctime>
#include <stdlib.h>
using namespace std;
ifstream fin("algsort.in");
ofstream fout("algsort.out");
long a[500002],n,i;
int part(int p,int u){
    int x = p+rand()%(u-p);
    swap(a[p], a[x]);
    int i,j,d=a[u];
    j=p-1;
    for(i=p;i<=u && i!=j;i++)
        if(a[i]<=d) swap(a[++j],a[i]);
    return j;
}
void quicksort(int p,int u){
    if(p>=u)
        return;
    int poz=part(p,u);
    if(p<poz-1);
        quicksort(p,poz-1);
    if(u>poz+1)
        quicksort(poz+1,u);
}
int main(){
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>a[i];
        srand(time(0));
    quicksort(1,n);
    for(i=1;i<=n;i++)
        fout<<a[i]<<" ";
    fin.close();fout.close();
    return 0;
}