ccf 201312-2 ISBN号码，水题，考前增强信心

#include<iostream>
#include<string>
using namespace std;
int main() {
	string n;
	cin >> n;
	int num[100];
	int q = 0;
	string::iterator s;
	for (s = n.begin(); s != n.end()-1; s++) {
		if (*s != '-') {
			num[q] = *s; q++;
		}
	}
	int sum = 0;
	for (int i = 0; i < n.length()-3; i++) {
		sum += num[i] * i;
	}
	int check = sum % 11;
	if (check == 10) check = 'X';
	//cout << (check==*(n.end() - 1)-'0') << endl;
	if (check == *(n.end()-1)-'0') cout << "Right";
	else {
		string::iterator s1;
		for (s1 = n.begin(); s1 != n.end()-1; s1++) {cout<<*s1;	}
		cout << check;
	}
	return 0;
}