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Cod sursa(job #236673)
#include <stdio.h>
int divide (int p,int q)
{
int st,dr,x;
st=p;
dr=q;
x=a[p];
while (st<dr)
{
while (st<dr && a[dr]>=x)
--dr;
a[st]=a[dr];
while (st<dr && a[st]<=x)
++st;
a[dr]=a[st];
a[st]=x;
}
return st;
}
void qsort (int p, int q)
{
int m;
m=divide (p,q);
if (m-1>p)
qsort (p,m-1);
if (m+1<q)
qsort (m+1,q);
}
int main ()
{
freopen ("economie.in","r",stdin);
freopen ("economie.out","w",stdout);
int i;
scanf ("%d",&n);
for (i=1; i<=n; ++i)
scanf ("%d",&a[i]);
qsort (1,n);
return 0;
}