Numere mari

#include <bits/stdc++.h>

using namespace std;

ifstream fin("baza.in");
ofstream fout("baza.out");

vector<int> x, y, z;
char numere[1001];

vector<int> adunare_numere_mari(vector<int> x, vector<int> y)
{
    vector<int> rez;
    int l = x.size(), t = 0, r = 0;

    for(int i = 0; i < l; i++)
    {
        r = x[i] + y[i] + t;
        rez.push_back(r % 10);
        t = r / 10;
    }
    if(t)
    {
        rez.push_back(t);
    }
    return rez;
}

vector<int> inmultire_scalar(vector<int> x, int s )
{
    int t = 0;
    vector<int> rez;

    for(int i = 0; i < x.size(); i++)
    {
        int r = x[i] * s + t;
        rez.push_back(r % 10);
        t = r / 10;
    }
    while(t)
    {
        rez.push_back(t % 10);
        t /= 10;
    }
    return rez;
}

vector<int> inmultire_numere_mari(vector<int> x, vector<int> y)
{
    int t = 0, marime = x.size() + y.size() - 1;
    vector<int> rez;
    rez.resize(marime);

    for(int i = 0; i < x.size(); i++)
    {
        for(int j = 0; j < y.size(); j++)
        {
            rez[i+j] += x[i] * y[j];
        }
    }
    for(int i = 0; i < marime; i++)
    {
        int r = t + rez[i];
        rez[i] = r % 10;
        t = r / 10;
    }
    while(t)
    {
        rez.push_back(t % 10);
        t /= 10;
    }
    return rez;
}

vector<int> scadere_numere_mari(vector<int> x, vector<int> y)
{
    int t = 0;
    vector<int> rez;

    for(int i = 0; i < x.size(); i++)
    {
        int r = x[i] - y[i] - t;
        if(r < 0)
            r += 10, t = 1;
        else
            t = 0;
        rez.push_back(r);
    }
    while(t)
    {
        rez.push_back(t % 10);
        t /= 10;
    }
    while(rez.back() == 0 && rez.size() > 1)
        rez.pop_back();
    return rez;
}

vector<int> impartire_scalar(vector<int> x, int s)
{
    int t = 0;
    vector<int> rez;

    for(int i = x.size()-1; i >= 0; i--)
    {
        int r = t * 10 + x[i];
        rez.push_back(r / s);
        t = r % s;
    }
    return rez;
    /// pentru imparire nu mai inversez vectorul
}

void afisare(vector<int> a)
{
    for(const auto it : a)
        if(it > 9)
            fout << char(it - 10 + 65);
        else
            fout << it;
    fout << '\n';
}

int main()
{
    fin >> numere;
    for(int i = 0; i < strlen(numere); i++)
        if(isdigit(numere[i]))
            x.push_back(numere[i]-'0');
        else
            x.push_back(numere[i] - 65 + 10);

    fin >> numere;
    for(int i = 0; i < strlen(numere); i++)
        if(isdigit(numere[i]))
            y.push_back(numere[i] - '0');
        else
            y.push_back(numere[i] - 65 + 10);

    reverse(x.begin(), x.end());
    reverse(y.begin(), y.end());

    while(x.size() < y.size())
        x.push_back(0);

    while(y.size() < x.size())
        y.push_back(0);

    afisare(x);
    afisare(y);

    //z = adunare_numere_mari(x, y);
    //z = inmultire_scalar(x, 2);
    //z = inmultire_numere_mari(x, y);
    //z = scadere_numere_mari(x, y);
    z = impartire_scalar(x, 2);

    //reverse(z.begin(), z.end());
    afisare(z);
}