代码

// 1000f: binary I/O — read 20 doubles from stdin, write 10 sums to OB
#include <stdint.h>
struct DuckInfo {
    unsigned long abi; const char *stdin_ptr; unsigned long stdin_size;
    char *stdout_ptr; unsigned long stdout_limit; unsigned long stdout_size;
    char *stderr_ptr; unsigned long stderr_limit; unsigned long stderr_size;
    const char *IB_ptr; unsigned long IB_limit; char *OB_ptr; unsigned long OB_limit;
    unsigned long tsc;
} __attribute__((packed));
double plus(double a, double b) { return a + b; }

extern "C" void __libc_start_main(int (*m)(int,char**,char**), int ac, char **av,
                                   void *x, void *y, void *z) {
    (void)m;(void)ac;(void)x;(void)y;(void)z;
    unsigned long *q = (unsigned long*)&av[ac + 1];
    while (*q) q++; q++;
    struct DuckInfo *d = 0;
    while (q[0]) { if (q[0] == 0x6b637564) { d = (struct DuckInfo*)q[1]; break; } q += 2; }
    const double *in = (const double*)d->stdin_ptr;
    double *out = (double*)d->OB_ptr;
    for (int i = 0; i < 10; i++) {
        out[i] = in[2*i] + in[2*i+1];
    }
    __asm__ volatile("mov $60,%%rax; xor %%rdi,%%rdi; syscall" ::: "rax","rdi","memory");
    __builtin_unreachable();
}

评测结果