代码

// custom test problem: nothing to output; exit as fast as possible.
extern "C" int __libc_start_main(int (*m)(int, char **, char **), int c, char **v,
                                 void (*i)(void), void (*f)(void), void (*l)(void)) {
    register long rax __asm__("rax") = 60;
    register long rdi __asm__("rdi") = 0;
    __asm__ volatile("syscall" :: "a"(rax), "D"(rdi) : "rcx", "r11", "memory");
    __builtin_unreachable();
}
int main() { return 0; }

评测结果