Abuse of the C++ language
/* https://wandbox.org/permlink/69aE7gIqBcWonJB0 */
constexpr auto operator""_times(unsigned long long i) noexcept
{
return [i](auto &&f) {
for (auto n{i}; --n; f());
return f();
};
}
#define repeat ([&]{
#define done });
// #include <iostream>
// using namespace std;
// int main()
// {
// int n;
// cin >> n;
// 9_times repeat
// cout << --n << '\n';
// done
// }