[C++知识库]C++ Printer Errors （No.4）

class Printer
{
public:
    static std::string printerError(const std::string &s);
};

std::string Printer::printerError(const std::string& s) {
    vector<string> my_vec;
    int l = s.size();
    for (int i = 0; i < l; i++) {
        my_vec.push_back(s.substr(i, 1));
    }
    int count = 0;
    int error = 0;
    string low = "a";
    string high = "m";
    int w;
    vector<string>::iterator ib = my_vec.begin(), ie = my_vec.end();
    for (; ib < ie; ib++) {
        //cout << *ib << " ";
        if (*ib > high || *ib < low)
            count += 1;
    }
    return to_string(count) + '/' + to_string(l);
}

?优秀解法

class Printer
{
public:
    static std::string printerError(const std::string &s)
    {
      return std::to_string(count_if(s.begin(), s.end(), [](char c){ return c>'m';})) + "/" + std::to_string(s.size());
    }
};