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Cod sursa(job #392536)
#include <cstdio>
#include <cstdlib>
#define N 3000005
int A[N];
int poz(int a, int b, int k)
{
int t,x=a,y=b,r=a+rand()%(b-a+1);
t=A[a]; A[a]=A[r]; A[r]=t;
for (int i=0, j=-1; x<y; x+=i, y+=j)
if (A[x]>A[y])
{
t=A[x]; A[x]=A[y]; A[y]=t;
t=i; i=-j; j=-t;
}
if (x==k) return A[k];
if (x<k) return poz(x+1,b,k);
return poz(a,x-1,k);
}
int main()
{
int n,k;
freopen("sdo.in","r",stdin);
freopen("sdo.out","w",stdout);
scanf("%d%d",&n,&k);
for (int i=1; i<=n; i++) scanf("%d",&A[i]);
printf("%d",poz(1,n,k));
return 0;
}