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Cod sursa(job #462324)
#include <cstdlib>
#include <fstream>
#include <iterator>
#include <algorithm>
#define MAX_N 3000011
/*
*
*/
using namespace std;
int v[MAX_N];
int main( void )
{
int N, k;
ifstream in( "sdo.in" );
in>>N>>k;
copy( istream_iterator<int>(in), istream_iterator<int>(), v+1 );
ofstream out( "sdo.out" );
nth_element( v+1, v+k+1, v+N+1 );
out<<v[k]<<'\n';
return EXIT_SUCCESS;
}