Cod sursa(job #1224162)

Utilizator S7012MYPetru Trimbitas S7012MY Data 29 august 2014 23:11:50
Problema Sortare prin comparare Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.93 kb
#include <fstream>
#include <cstdlib>
#include <algorithm>
#include <ctime>
using namespace std;
 
 
int n,v[500001];
 
int partitie(int p, int r) {
    int x,i,j;
    x=v[p];
    i=p-1;
    j=r+1;
    while (1) {
        do {
            j--;
        } while (v[j]>x);
        do {
            i++;
        }
        while(v[i]<x);
        if(i<j) swap(v[i],v[j]);
        else return j;
    }
}
 
int partitie_aleatoare (int p, int r) {
    int i;
    i=(rand() % (r-p)) + p + 1;
    //i=(r+p)/2;
    swap(v[p],v[i]);
    return partitie(p,r);
}
 
void qsort_aleator(int p, int r) {
    int q;
    if(p<r) {
        q=partitie_aleatoare(p,r);
        qsort_aleator(p,q);
        qsort_aleator(q+1,r);
    }
}
 
int main()
{
    srand( time(NULL) );
    int i;
    ifstream f("algsort.in");
    ofstream g("algsort.out");
    scanf("%d",&n);
    for(i=1; i<=n; i++) f>>v[i];
    qsort_aleator(1,n);
    for(i=1; i<=n; i++) g<<v[i]<<' ';
    return 0;
}