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Cod sursa(job #677376)
//http://infoarena.ro/problema/algsort
#include<iostream.h>
#include<fstream.h>
ifstream fin("algsort.in");
ofstream fout("algsort.out");
long a[500000],n;
void quickSort(long arr[], long left, long right)
{
long i = left, j = right;
long tmp;
long pivot = arr[(left + right) / 2];
/* partition */
while (i <= j)
{
while (arr[i] < pivot)
i++;
while (arr[j] > pivot)
j--;
if (i <= j)
{
tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
i++;
j--;
}
};
/* recursion */
if (left < j)
quickSort(arr, left, j);
if (i < right)
quickSort(arr, i, right);
}
int main()
{
long i;
fin>>n;
for(i=1;i<=n;i++)
fin>>a[i];
quickSort(a,1,n);
for(i=1;i<=n;i++)
fout<<a[i]<<" ";
return 0;
}