百练OJ-ISBN号码

#include<iostream>
#include<math.h>
#include<string>
#include<vector>
using namespace std;
void replace_all(string & s, string const & t, string const & w)
{
	string::size_type pos = s.find(t), t_size = t.size(), r_size = w.size();
	while (pos != string::npos) { // found   
		s.replace(pos, t_size, w);
		pos = s.find(t, pos + r_size);
	}
}
string strip(string const & s, char c = ' ')
{
	string::size_type a = s.find_first_not_of(c);
	string::size_type z = s.find_last_not_of(c);
	if (a == string::npos) {
		a = 0;
	}

	if (z == string::npos) {
		z = s.size();
	}
	return s.substr(a, z);
}
int main() {
	string m;
	string temp;
	while (cin >> m) {
		temp = m;
		replace_all(m, "-", "");
		int num = 0;
		for (int i = 0; i < m.size() - 1; i++) {
			num += (m[i] - '0')*(i + 1);
		}
		num = num % 11;
		if (num == m[m.size() - 1] - '0') {
			cout << "Right" << endl;
		}
		else
		{
			if (num != 10) { 
				temp.replace(temp.find_last_of("-") + 1, 1, to_string(num)); 
				cout << temp << endl;
			}
			else {
				if (m[m.size() - 1] == 'X') {
					cout << "Right" << endl;
					}
				else {
					temp.replace(temp.find_last_of("-") + 1, 1, "X");
					cout << temp << endl;
				}
			}
			
		}
	}
	return 0;
}