Problema 5 (până acum)

#include <iostream>
using namespace std;

int* suma(int a[], int b[], int max, bool &incaOCifra) {
    int s[50];
    int t = 0;
    for (int i = max - 1; i >= 0; i--) {
        int suma = a[i] + b[i] + t;
        s[i] = suma % 10;
        t = suma / 10;
    }
    if (t) {
        s[max] = t;
        incaOCifra = true;
    }
    return s;
}

int main() {
    int a[50], b[50], n, m, *s, d[50];

    char aa[51], bb[51];
    cout << "a = "; cin >> aa; n = strlen(aa);
    cout << "b = "; cin >> bb; m = strlen(bb);

    int max = n >= m ? n : m;
    for (int i = 0; i < max; i++) {
        a[i] = 0;
        b[i] = 0;
    }
    for (int i = 0; i < n; i++) {
        a[max - n + i] = aa[i] - '0';
    }
    for (int i = 0; i < m; i++) {
        b[max - m + i] = bb[i] - '0';
    }

    cout << "a = ";
    for (int i = max - n; i < max; i++) {
        cout << a[i];
    }
    cout << endl << "b = ";
    for (int i = max - m; i < max; i++) {
        cout << b[i];
    }

    // Adunare:
    bool incaOCifra = false;
    s = suma(a, b, max, incaOCifra);

    cout << endl << "a + b = ";
    if (incaOCifra) {
        cout << s[max];
    }
    for (int i = 0; i < max; i++) {
        cout << s[i];
    }

    // Scadere:
    for (int i = max - 1; i >= 0; i--) {
        int dif = a[i] - b[i];
        if (dif < 0) {
            a[i - 1]--;
            d[i] = 10 + dif;
        }
        else {
            d[i] = dif;
        }
    }

    cout << endl << "a - b = ";
    int i = 0;
    while (d[i] == 0) {
        i++;
    }
    for (; i < max; i++) {
        cout << d[i];
    }
    cout << endl;
    cin >> n;

    return 0;
}