#include <iostream>
#include <type_traits>
template <int N>
typename std::enable_if<N, int>::type f() { return N; }
template <int N>
typename std::enable_if<!N, std::string>::type f() { return "zero"; }
int main()
{
std::cout << f<1>() << std::endl;
std::cout << f<0>() << std::endl;
return 0;
}
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