AJUTOR M-AM SATURAT DE PROBLEMA!!

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

vector < int > suma;
vector < int > produs;
vector < int > cifren;
int coeficienti[] = {4, 30, 50, 30, 6};

void prod(vector < int > &v, vector < int > &v2)
{
    int i, j, t = 0;

    vector < int > v3 = vector < int > (v.size() + v2.size() - 1 , 0);

    for(i = 0; i < v.size(); i++)
    {
        for(j = 0; j < v2.size(); j++)
        {
            v3[i + j] += v[i] * v2[j];
        }
    }

    for(i = 0; i < v3.size(); i++)
    {
        t += v3[i];

        v3[i] = t % 10;

        t /= 10;
    }

    while(t)
    {
        v3.push_back(t % 10);
        t /= 10;
    }

    cout <<"v3 ";


    v = vector < int > ();

    for(i = 0; i < v3.size(); i++)
    {
        cout << v3[i];
        v.insert(v.begin() , v3[i]);
    }
    cout << " ";
}

void adunare(vector < int > &v, vector < int > &v2)
{
    int e = 0, i;

    if(v.size() < v2 .size())
    {
        v.resize(v2.size());

        for(i = v.size(); i < v2.size(); i++)
        {
            v.push_back(0);
        }
    }
    else
    {
        for(i = v2.size(); i < v.size(); i++)
        {
            v2.push_back(0);
        }

    }

    for(i = 0; i < v.size(); i++)
    {
        e += (v[i] + v2[i]);
        v[i] = e % 10;
        e /= 10;
    }

   while(e)
    {
        v.push_back(e % 10);
        e /= 10;
    }
}

void imp(vector < int > &v , int n)
{
    int i , r = 0;

    for(i = v.size() - 1; i >= 0; i--)
    {
        r = r * 10 +  v[i];
        v[i] = r / n;
        r %= n;
    }



    for( ; v.size() > 1 && v[v.size() - 1] == 0 ;  )
    {
        v.pop_back();
    }

    cout<<"imp ";

    for(i = 0; i < v.size(); i++)
    {
        cout << v[i] << " ";
    }
    cout<<endl;
}

int main()
{
    int n;

    cin >> n;

    while(n)
    {
        cifren.insert(cifren.begin(), n % 10);
        n /= 10;
    }

    int p = 1;
    int i, j;

    for(i = 0; i < cifren.size(); i++)
    {
        cout << cifren[i];
    }

    cout << '\n';

    for(i = 0; i < 5; i++)
    {
        while(coeficienti[i])
        {
            produs.insert(produs.begin(), coeficienti[i] % 10);
            coeficienti[i] /= 10;
        }

        cout << "\ncifre coeficienti: ";

        for(j = 0; j < produs.size(); j++)
        {
            cout << produs[j];
        }

        cout << '\n';

        cout << "i: " << i + 1 << '\n';

        for(j = 0; j < p; j++)
        {
            prod(produs, cifren);
            cout << "p: " << j + 1 << " ";
            for(int k = 0; k < produs.size(); k++)
            {
                cout << produs[k];
            }

            cout << '\n';
        }
        cout << "produs nou: ";

        for(j = 0; j< produs.size(); j++)
        {
            cout << produs[j];
        }

        cout << '\n';
        cout << "suma ";

        adunare(suma, produs);
        p++;
        produs = vector < int > (0);

    for(j = 0; j < suma.size(); j++)
    {
        cout << suma[i];
    }

    cout << '\n';
}

    for(j = 0; j < suma.size(); j++)
    {
        cout << suma[j];
    }

    cout << '\n';

    imp(suma , 120);


    cout << "suma ";
    for(i = 0; i < suma.size(); i++)
    {
        cout << suma[i];
    }

    return 0;
}