代码

// This code is AI-generated. (AI 生成的代码)
typedef unsigned long long u64;
struct DuckInfo { u64 abi; const char *in; u64 in_size; char *out; u64 out_limit, out_size; char *err; u64 err_limit, err_size; const char *IB; u64 IB_limit; char *OB; u64 OB_limit; u64 tsc; } __attribute__((packed));
struct J { u64 a,b,r; };
#include <pthread.h>
static void *work(void *arg){ struct J*j=(struct J*)arg; j->r=j->a*j->b-j->a-j->b; return 0; }
int main(void){return 0;}
void __libc_start_main(int(*mf)(int,char**,char**),int ac,char**av){
    struct DuckInfo *d=(struct DuckInfo*)((u64*)av)[29];
    const char*p=d->in; u64 a=0,b=0;
    while(*p<'0'||*p>'9')p++; while(*p>='0'&&*p<='9')a=a*10+(*p++-'0');
    while(*p<'0'||*p>'9')p++; while(*p>='0'&&*p<='9')b=b*10+(*p++-'0');
    struct J j; j.a=a; j.b=b; j.r=0;
    pthread_t t;
    int ok = (pthread_create(&t,0,work,&j)==0);
    if(ok) pthread_join(t,0);
    u64 r = ok ? j.r : 123456789ULL;   /* wrong sentinel if threads fail */
    char tmp[24]; int k=0; do{tmp[k++]='0'+r%10;r/=10;}while(r);
    char*o=d->out; while(k)*o++=tmp[--k]; *o++='\n'; d->out_size=o-d->out;
    __asm__ volatile("mov $60,%%eax; xor %%edi,%%edi; syscall" ::: "rax","rdi","memory");
    __builtin_unreachable();
}

评测结果