Alien Invasion II

input/code.cpp: In function 'std::__cxx11::string longDivision(std::__cxx11::string, int)':
input/code.cpp:15:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (number.size() > idx) { 
            ~~~~~~~~~~~~~~^~~~~
input/code.cpp: In function 'int main()':
input/code.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < x.size(); i++) {
                     ~~^~~~~~~~~~
input/code.cpp:28:12: warning: unused variable 'm' [-Wunused-variable]
     int s, m;
            ^
input/code.cpp:32:22: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int add = 3 - (s % 3);
                   ~~~^~~~

#include <iostream>
#include <string>

using namespace std;

string longDivision(string number, int divisor) 
{ 
    string ans; 
  
    int idx = 0; 
    int temp = number[idx] - '0'; 
    while (temp < divisor) 
        temp = temp * 10 + (number[++idx] - '0'); 
  
    while (number.size() > idx) { 
        ans += (temp / divisor) + '0'; 
        temp = (temp % divisor) * 10 + number[++idx] - '0'; 
    } 
    if (ans.length() == 0) 
        return "0"; 
    return ans; 
}

int main() {
    string x;
    cin >> x;
    //int t = x;
    int s, m;
    for (int i = 0; i < x.size(); i++) {
        s += (x[i] - '0');
    } 
    int add = 3 - (s % 3);
    string str = to_string(add) + x;
    cout << str << endl;
    cout << 3 << " " << longDivision(str, 3);
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED