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Cod sursa(job #757978)
#include <fstream>
#include <cstdlib>
using namespace std;
const int N = 500005;
int v[N], aux[N], n;
ifstream in("algsort.in");
ofstream out("algsort.out");
inline void sch(int& a, int& b)
{
int c = a;
a = b;
b = c;
}
void quick(int st,int dr)
{
if (st >= dr)
return;
int p, i, j;
sch(v[st + rand() % (dr - st + 1)], v[dr]);
p = v[dr];
for (i = st - 1, j = dr ; i < j ; )
{
while (i < j && v[++i] < p);
while (i < j && v[--j] > p);
sch(v[i], v[j]);
}
sch(v[i], v[dr]);
quick(st, i - 1);
quick(i + 1, dr);
}
int main()
{
in >> n;
for (int i = 1 ; i <= n ; i++)
in >> v[i];
quick(1, n);
for (int i = 1 ; i <= n ; i++)
out << v[i] << " ";
out << "\n";
return 0;
}