本地跑能过，线上跑AllWrongAnswer编译器clang16

#include <stdio.h>
#include <malloc.h>
#include <string.h>

int howManySpace(const char *);
void compute(int position,char** question,int * mode);

const char plus [50]="%d+%d=%d";
const char multiply[50]="%d*%d=%d";
const char minus[50]="%d-%d=%d";

enum{Plus,Multiply,Minus};
int main()
{
    int num;
    scanf("%d",&num);
    getchar();
    char ** question = (char **)malloc(num*sizeof(char *));
    for(int i=0;i<num;i++)
    {
        question[i]=(char *)malloc(50*sizeof(char));
        fgets(question[i], 50, stdin);
    }

    int mode;
    for(int i=0;i<num-1;i++)
    {
       compute(i, question, &mode);
       printf("\n");
    }
    compute(num-1, question, &mode);

    for(int i=0;i<num;i++)
    {
        free(question[i]);
    }
    free(question);
    return 0;
}

int howManySpace(const char * source)
{
    int ans=0;
    for(int i=0;source[i]!='\0';i++)
    {
        if(source[i]==' ')
        {
            ans++;
        }
    }
    return ans;
}

void compute(int position,char** question,int * mode)
{
    if(howManySpace(question[position])==2)
    {
        char m;int a;int b;
        sscanf(question[position], "%c%d%d",&m,&a,&b);
        if(m=='a')
        {
            *mode=Plus;
            char answer[50];
            sprintf(answer, plus,a,b,a+b);
            printf("%s\n%d",answer,(int)strlen(answer));
        }
        else if (m=='b') {
            *mode=Minus;
            char answer[50];
            sprintf(answer, minus,a,b,a-b);
            printf("%s\n%d",answer,(int)strlen(answer));
        }
        else {
            *mode=Multiply;
            char answer[50];
            sprintf(answer, multiply,a,b,a*b);
            printf("%s\n%d",answer,(int)strlen(answer));
        }
    }
    else {
        int a, b;
        sscanf(question[position], "%d%d",&a,&b);
        char answer[50];
        if(*mode==Plus)
        {
            char answer[50];
            sprintf(answer, plus,a,b,a+b);
            printf("%s\n%d",answer,(int)strlen(answer));
        }
        else if (*mode==Minus) {
            char answer[50];
            sprintf(answer, minus,a,b,a-b);
            printf("%s\n%d",answer,(int)strlen(answer));
        }
        else {
            char answer[50];
            sprintf(answer, multiply,a,b,a*b);
            printf("%s\n%d",answer,(int)strlen(answer));
        }
    }
}

不知为何，本地跑可以通过，线上却不行