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Cod sursa(job #392788)
#include <cstdio>
#include <cstdlib>
#define N 3000005
#define S_MAX 65536
int A[N];
int p=-1;
char S[S_MAX];
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);
}
void read(int &x)
{
x=0;
for (; S[p]<'0' && S[p]>'9'; ++p)
if (p==S_MAX)
{
fread(S,1,S_MAX,stdin);
p=-1;
}
for (; S[p]>='0' && S[p]<='9'; ++p)
{
x=10*x+S[p]-'0';
if (p==S_MAX)
{
fread(S,1,S_MAX,stdin);
p=-1;
}
}
}
int main()
{
int n,k;
freopen("sdo.in","r",stdin);
freopen("sdo.out","w",stdout);
fread(S,1,S_MAX,stdin);
read(n); read(m);
for (int i=1; i<=n; i++) read(A[i]);
printf("%d",poz(1,n,k));
return 0;
}