multimi

#include <iostream>

using namespace std;

int main()

{
    int pb;
    cout << "Introdu nr problemei: "; cin >> pb;
    switch (pb)
    {
    case 1:
    {
        int A[100], B[100], a, b;
        cout << "Cate elemente are multimea A?"; cin >> a;
        cout << "Cate elemente are multimea B?"; cin >> b;
        cout << "Introduceti elementele multimii A: " << endl;
        for (int i = 0; i < a; i++)
            cin >> A[i];
        cout << "Introduceti elementele multimii B: " << endl;
        for (int j = 0; j < b; j++)
            cin >> B[j];
        //afisare multimi
        cout << "A={";
        for (int i = 0; i < a; i++)
            cout << A[i] << ",";
        cout << "}" << endl;
        cout << "B={";
        for (int j = 0; j < b; j++)
            cout << B[j] << ",";
        cout << "}" << endl;
        //intersectia
        int I[100], i = 0, k = 0;
        while (i < a)
        {
            int ok = 1;
            for (int j = 0; j < b && ok; j++)
            {
                if (A[i] == B[j])
                {
                    I[k] = A[i];
                    ok = 0;
                    k++;
                }
            }
            i++;
        }
        //reuniunea
        int R[200], l = 0;
        for (int i = 0; i < a; i++)
        {
            R[l] = A[i];
            l++;
        }
        int j = 0;
        while (j < b)
        {
            int ok = 1;
            for (int i = 0; i < a; i++)
            {
                if (A[i] == B[j])
                    ok = 0;
            }
            if (ok)
            {
                R[l] = B[j];
                l++;
            }
            j++;
        }
        //diferenta A\B
        int D[100], d = 0, m = 0;
        while (m < a)
        {
            int ok = 1;
            for (int j = 0; j < b; j++)
                if (A[m] == B[j])
                    ok = 0;
            if (ok)
            {
                D[d] = A[m];
                d++;
            }
            m++;
        }
        //afisare difernenta, reuniune, intersectie
        cout << "Diferenta A\B  este:{";
        for (int i = 0; i < d; i++)
            cout << D[i] << ",";
        cout << "}" << endl;
        cout << "Reuniunea celor doua multimi este: {";
        for (int i = 0; i < l; i++)
            cout << R[i] << ",";
        cout << "}" << endl;
        cout << "Intersectia multimilor A si B  este:{";
        for (int j = 0; j < k; j++)
            cout << I[j] << ",";
        cout << "}" << endl;
        break;
    }
    case 2:
    {
        int n, v[1000], d, k=0;
        cout << "Cate elemente are multimea??"; cin >> d;
        cout << "Introdu elementele multimii:";
        for (int i = 0; i < d; i++)
            cin >> v[i];
        cout << "Introdu nr: "; cin >> n;
        for (int i = 0; i < d; i++)
            if (v[i] == n)
                k++;
        if (k == 0)
            cout << "Nr citit nu se regaseste in multime" << endl;
        else
            cout << "Nr citit apare de " << k << " ori" << endl;
    }

    }
    system("pause");
    return 0;
}