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Cod sursa(job #984237)
#include <fstream>
#include <ctime>
#include <cstdlib>
#define maxn 500001
using namespace std;
ifstream fin("algsort.in");
ofstream fout("algsort.out");
int v[maxn],n;
void exchange (int &i, int &j)
{
int temp=v[i];
v[i]=v[j];
v[j]=temp;
}
void quicksort (int p, int q)
{
if (q<=p) return;
int x=v[rand()%(q-p+1)+p],i=p-1,j=q+1,f=p,l=q;
while (i<j)
{
do i++; while (v[i]<x);
do j--; while (v[j]>x);
if (i>=j) break;
exchange (i,j);
if (v[i]==x) {exchange (i,f); ++f;}
if (v[j]==x) {exchange (j,l); --l;}
}
quicksort (p,j);
quicksort (j+1,q);
}
int main()
{
fin>>n;
for (int i=1; i<=n; ++i) fin>>v[i];
srand (time(NULL));
quicksort (1,n);
for (int i=1; i<=n; ++i) fout<<v[i]<<" ";
}