代码

// This code is AI-generated. (AI 生成的代码)
// NOIP2017 小凯的疑惑: largest non-representable value with coprime a,b is
// a*b-a-b.  Read a,b from DuckInfo and print it directly.
typedef unsigned long long u64;
struct DuckInfo {
    u64 abi;
    const char *in; u64 in_size;
    char *out; u64 out_limit; u64 out_size;
    char *err; u64 err_limit; u64 err_size;
    const char *ib; u64 ib_limit;
    char *ob; u64 ob_limit; u64 tsc;
} __attribute__((packed));

int main(void) { return 0; }

void __libc_start_main(int (*mf)(int, char **, char **), int ac, char **av) {
    (void)mf;
    char **e = av + ac + 1;
    while (*e) e++;
    u64 *aux = (u64 *)(e + 1);
    struct DuckInfo *d = 0;
    for (; aux[0]; aux += 2)
        if (aux[0] == 0x6b637564) { d = (struct DuckInfo *)aux[1]; break; }
    const char *p = d->in;
    u64 a = 0, b = 0;
    while (*p && (*p < '0' || *p > '9')) p++;
    while (*p >= '0' && *p <= '9') a = a * 10 + (u64)(*p++ - '0');
    while (*p && (*p < '0' || *p > '9')) p++;
    while (*p >= '0' && *p <= '9') b = b * 10 + (u64)(*p++ - '0');
    u64 r = a * b - a - b;
    char tmp[24];
    int n = 0;
    do { tmp[n++] = (char)('0' + r % 10); r /= 10; } while (r);
    char *o = d->out;
    while (n) *o++ = tmp[--n];
    *o++ = '\n';
    d->out_size = (u64)(o - d->out);
    __asm__ volatile("mov $60,%eax; xor %edi,%edi; syscall" ::: "rax","rdi","rcx","r11","memory");
    __builtin_unreachable();
}

评测结果