gg

#include<string>
#include<cstring>
#include<stdio.h>
#include<vector>
#include <sstream>
#include<iostream>
int summ (int number){
    int sum = 0;
        while (number > 0){
            sum += number % 10;
            number = number / 10;
        }
    return sum;
}
std::string function(std::string &str){
    std::vector<int>numbers;
    int number = 0;
    for (size_t i = 0; i < str.length() + 1; ++i){
        if (str[i] != ' ' && str[i] != '\0') number *= 10;
        if (str[i] != ' ' && str[i] != '\0') number += (int)str[i] - 48;
        if (str[i] == ' ' || str[i] == '\0'){
            numbers.push_back(number);
            number = 0;
        }
    }
    int x;

    for (size_t i = 0; i < numbers.size() - 1; i++) {
        for (size_t j = 0; j < numbers.size() - i - 1; j++) {
            if (summ(numbers[j]) > summ(numbers[j+1])) {
                x = numbers[j];
                numbers[j] = numbers[j+1];
                numbers[j+1] = x;
            }
            if (summ(numbers[j]) == summ(numbers[j + 1])){
                std::stringstream ss;
                std::stringstream tt;
                ss << numbers[j];
                tt << numbers[j+1];
                if (ss.str().compare(tt.str()) > 0){
                    x = numbers[j];
                    numbers[j] = numbers[j+1];
                    numbers[j+1] = x;
                }
            }
        }
    }
    std::stringstream ss;
    for (size_t i = 0; i < numbers.size(); i++){
        ss << numbers[i];
        ss << " ";
        std::cout << numbers[i] << std::endl;
    }
    str = ss.str();
    return str;
}

int main(int argc, char const *argv[]){
    std::string str = "2000 10003 1234000 44444444 9999 11 11 22 123";
    std::cout << function(str) << std::endl;
    return 0;
}