#include <algorithm>
#include <vector>
#include <assert.h>
int main()
{
int ia[] = {29,23,20,22,17,15,26,51,19,12,35,40};
sort( &ia[0], &ia[12] );
bool found_it = binary_search( &ia[0], &ia[12], 18 );
assert( found_it == false );
vector< int > vec( ia, ia+12 );
sort( vec.begin(), vec.end(), greater<int>() );
found_it = binary_search( vec.begin(), vec.end(),26, greater<int>() );
assert( found_it == true );
}