为什么全是WA，测试数据都通过了，求助！！！

#include<bits/stdc++.h>
using namespace std;
int getlen(int x)
{
    string a = to_string(x);
    return a.length();
}
int main()
{
    int n;
    cin >> n;
    bool flag = true;
    string s;
    char fh;
    int x1, x2, a1, a2; 
    char temp;
    cin.ignore();
    while (n--)
    {
        getline(cin, s);
        temp = s[0];
        if (!isdigit(temp))
        {
            fh = temp;
            a1=s.find(' ');
            string s2 = s.substr(a1 + 1);
            a2 = s2.find(' ');
            x1 = atoi(s2.substr(0, a2).c_str());
            x2 = atoi(s2.substr(a2 + 1).c_str());
        }
        else
        {
            a1 = s.find(' ');
            x1 = atoi(s.substr(0, a1).c_str());
            x2 = atoi(s.substr(a1 + 1).c_str());
        }
        switch (fh)
        {
        case 'a':cout << x1 << "+" << x2 << "=" << x1 + x2 << endl;
            cout << getlen(x1) + getlen(x2) + getlen(x1 + x2) + 2 << endl;
            break;
        case 'b':cout << x1 << "-" << x2 << "=" << x1 - x2 << endl;
            cout << getlen(x1) + getlen(x2) + getlen(x1 - x2) + 2 << endl;
            break;
        case 'c':cout << x1 << "*" << x2 << "=" << x1 * x2 << endl;
            cout << getlen(x1) + getlen(x2) + getlen(x1 * x2) + 2 << endl;
            break;
        }
    }
}