题解

#include <iostream>
using namespace std;

int main() {
    char ch;
    int sum = 0, count = 0;
    
    // 单次遍历，实时计算，不存储整个字符串
    for (int i = 1; i <= 12; i++) {
        cin.get(ch);
        if (ch >= '0' && ch <= '9') {
            count++;
            sum += (ch - '0') * count;
        }
    }
    
    // 读取最后一个字符（识别码）
    char last_char;
    cin.get(last_char);
    
    // 计算正确识别码
    char correct_char;
    int mod_result = sum % 11;
    if (mod_result == 10) {
        correct_char = 'X';
    } else {
        correct_char = mod_result + '0';
    }
    
    // 直接比较并输出，不存储中间结果
    if (last_char == correct_char) {
        cout << "Right";
    } else {
        // 重新输出前12个字符
        cin.clear();
        cin.seekg(0);
        for (int i = 0; i < 12; i++) {
            cout.put(cin.get());
        }
        cout << correct_char;
    }
    
    return 0;
}