为什么0分

本地过了，洛谷0分？

#include <bits/stdc++.h>

using namespace std;

char fff,s[20], total[20];

int main(){
    int n, a, b, c;
    cin >> n;
    getchar();
    while(n--){
        fgets(s, sizeof(s), stdin);
        getchar();
        if(s[0] == 'a' || s[0] == 'b' || s[0] == 'c')
            fff = s[0], s[0] = ' ';
        sscanf(s, "%d %d", &a, &b);
        switch(fff){
            case 'a':c = a + b;sprintf(total, "%d+%d=%d", a, b, c);break;
            case 'b':c = a - b;sprintf(total, "%d-%d=%d", a, b, c);break;
            case 'c':c = a * b;sprintf(total, "%d*%d=%d", a, b, c);break;
        }
        printf("%s\n%d\n",total ,strlen(total));
    }
    return 0;
}