将long long数组转换为字符串

#include <iostream>
#include <vector>
#include <string>

std::string convertArrayToString(const std::vector<long long>& arr) {
    std::string result;
    for (const auto& num : arr) {
        result += std::to_string(num) + " ";
    }
    return result;
}

int main() {
    std::vector<long long> arr = {123456789, 987654321, 555555555};
    std::string str = convertArrayToString(arr);
    std::cout << str << std::endl;
    return 0;
}