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Cod sursa(job #373217)
#include<stdio.h>
#include<vector>
#include<algorithm>
#include<ctime>
using namespace std;
vector <int> a(1);
int n,k;
int partition(int st,int dr)
{
int i=st-1,j=dr+1,q=a[st+(rand()%(dr-st+1))];
while(1)
{
do
{
i++;
}while(a[i]<q);
do
{
j--;
}while(q<a[j]);
if(i<j)
swap(a[i],a[j]);
else
return j;
}
return 0;
}
int sdo(int st,int dr,int ind)
{
if(st==dr)
return a[st];
int q=partition(st,dr);
k=q-st+1;
if(ind<=k)
return sdo(st,q,ind);
else
return sdo(q+1,dr,ind-k);
}
int main()
{
srand(time(NULL));
freopen("sdo.in","r",stdin);
freopen("sdo.out","w",stdout);
scanf("%d%d",&n,&k);
for(int i=0;i<n;i++)
{
int x;
scanf("%d",&x);
a.push_back(x);
}
printf("%d\n",sdo(1,n,k));
return 0;
}