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#include <iostream>
using namespace std;

int** vvodmatr(int n)
{
    cout << "Введите вашу матрицу смежности: \n";
    int** matrix = new int* [n];
    for (int i = 0; i < n; i++)
        matrix[i] = new int[n];
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            cin >> matrix[i][j];
    return matrix;
}
bool isgood(int*col, int**matrix, int n)
{
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            if (matrix[i][j] && (col[i] == col[j]) && (col[i] != 0))
                return false;
    return true;
}
bool color(int*col, int k, int n, int**matrix)
{
    bool f = false;
    int i = 1;
    for (i; i >= 0 && i < n; i++)
    {
    ex:
        if (f)
        {
            f = false;
            if (col[i] > k)
                goto ex2;
        }
        else
            if (col[i] + 1 <= k)
                col[i]++;
            else
                goto ex2;
    ex1:
        if (!isgood(col,matrix,n))
            if (col[i] == k)
            {
            ex2:
                col[i] = 0;
                if (i - 1 >= 0)
                {
                    col[i - 1]++;
                    i--;
                }
                else
                    return 1;
                f = true;
                goto ex;
            }
            else
            {
                col[i]++;
                goto ex1;
            }
    }
    if (i < 0)
        return true;
    return false;
}
void deletematrix(int** m, int n)
{
    for (int i = 0; i < n; i++)
        delete[] m[i];
    delete[] m;
}
int main()
{
    setlocale(LC_ALL, "RU");
    int n;
    cout << "Введите количество вершин: \n";
    cin >> n;
    int** matrix = vvodmatr(n);
    int* col = new int[n];
    for (int k = 4; k > 0; k--)
    {
        col[0] = 1;
        for (int l = 1; l < n; l++)
            col[l] = 0;
        if (color(col,k,n,matrix))
        {
            cout << "Хроматическое число = " << k + 1;
            break;
        }
    }
    deletematrix(matrix, n);
    return 0;
}