#include <iostream>
#include <string>
#include <random>
#include <algorithm>
 
std::string generateRandomCode(int length = 8) {
    const std::string characters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    std::random_device rd;
    std::mt19937 generator(rd());
    std::uniform_int_distribution<> distribution(0, characters.size() - 1);
 
    std::string code;
    for (int i = 0; i < length; ++i) {
        code += characters[distribution(generator)];
    }
    return code;
}
 
int main() {
    std::string username;
    std::cout << "กรุณาใส่ชื่อผู้ใช้: ";
    std::getline(std::cin, username);
 
    std::string code = generateRandomCode();
    std::cout << "ยินดีต้อนรับ " << username << "!" << std::endl;
    std::cout << "รหัสของคุณคือ: " << code << std::endl;
 
    return 0;
}

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