求助全部WA

测试可以过，第一个也可以过，第一个WA说第一行过短

#include <bits/stdc++.h>
using namespace std;

int string_to_int(string x){
    stringstream y;
    y << x;
    int z;
    y >> z;
    return z;
}

string int_to_string(int x){
    stringstream y;
    y << x;
    return y.str();
}
string r[55];
int r1[55];
int n;
int s = 0;
char type, memo;
string x, y;
string z;
bool flag = true;
int main()
{
    cin >> n;
    int count = 0;
    for(int i = 0; i < n; i++){
        fflush(stdin);
        if(flag){
            type = getchar();
            if(type == 'a' || type == 'b' || type == 'c'){
                memo = type;
            }
        }

        switch(memo){
            case 'a':
                cin >> x >> y;
                if(type != 'a'){
                    flag = true;
                    x = type + x;
                }
                z = int_to_string(string_to_int(x)+string_to_int(y));
                count += x.length()+y.length()+z.length()+2;
                r[s] = x+"+"+y+"="+z;
                r1[s++] = count;
                count = 0;
                break;
            case 'b':
                cin >> x >> y;
                if(type != 'b'){
                    flag = true;
                    x = type + x;;
                }
                z = int_to_string(string_to_int(x)-string_to_int(y));
                count += x.length()+y.length()+z.length()+2;
                r[s] = x+"-"+y+"="+z;
                r1[s++] = count;
                count = 0;
                break;
            case 'c':
                cin >> x >> y;
                if(type != 'c'){
                    flag = true;
                    x = type + x;
                }
                z = int_to_string(string_to_int(x)*string_to_int(y));
                count += x.length()+y.length()+z.length()+2;
                r[s] = x+"*"+y+"="+z;
                r1[s++] = count;
                count = 0;
                break;
        }
    }
    for(int i = 0; i < s; i++){
        cout << r[i] << endl << r1[i] << endl;
    }

    return 0;
}