#include <iostream>
using namespace std;
class TV;
class Remote
{
private:
int mode;
public:
Remote(int n) : mode(n){}
void set_chan(TV & t, int c);
};
class TV
{
public:
friend void Remote::set_chan(TV & t, int c);
TV(int n) : channel(n){}
private:
int channel;
};
inline void Remote::set_chan(TV & t, int c) { t.channel = c; }
int main() {
// your code goes here
return 0;
}
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