#include <iostream>

using namespace std;

class matrix{
private:
    int n,m;
    double **mx;
    double dt;
public:
    matrix(){
        this->mx = NULL;
    }
    matrix(int N,int M,double** MX){
        n=N; m=M;
        mx = new double * [n];
        for (int i=0;i<n;i++){
            mx[i] = new double [m];
            for (int j=0;j<m;j++)
                mx[i][j] = MX[i][j];
        }
    }
    matrix(const matrix* cp){
        this->n = cp->n;
        this->m = cp->m;
        mx = new double * [n];
        for (int i=0;i<n;i++)
            {
                mx[i] = new double [m];
                for (int j=0;j<m;j++)
                    mx[i][j] = cp->mx[i][j];
            }
    }
    ~matrix(){
        this->clear();
    }
    double calcMinor (int i,int j){
        if (n==m&&i<n&&j<m&&i>=0&&j>=0){
            double ** buf;
            buf = new double *[n-1];
            for (int q=0;q<n-1;q++)
                buf[q] = new double [m-1];

        }
        return 0;
    }
    void calcDet(){
        if (m==n)
            dt=det (n,mx);
    }
    void showDet(){
        cout << this->dt;
    }
    void showMatrix(){
        for (int i=0;i<n;i++){
            for (int j=0;j<m;j++) cout << mx[i][j] <<" ";
            cout << endl;
        }
    }
    int pow(int a,int b){
        int q=a;
        for (int i=0;i<b-1;i++){
        a*=q;
        }
        return a;
    }
    double det(int N,double** A){ // N-размерность матрицы, A-собственно матрица
        double sum=0;
        if (N==1) return A[0][0];
        else
        if(N!=2)
            for(int i=0;i<N;i++){ //Разложение по первой строке
                sum+=pow((-1),(i+2))*A[0][i]*det(N-1,minor(0,i,N,A));
            }
        else
        sum=A[0][0]*A[N-1][N-1]-A[N-1][0]*A[0][N-1];
        return sum;
    }
    double** minor(int z,int x,int N, double** A){
            double **C = new double*[N-1];
                for(int i=0;i<N-1;i++)
                    C[i]=new double[N-1];
                for(int h=0,i=0; i<N-1;i++,h++){
                if(i==z) h++;
                for(int k=0,j=0;j<N-1;j++,k++){
                    if(k==x) k++;
                    C[i][j]=A[h][k];
                }
            }
        return C;
    }
    void clear(){
        for (int i=0;i<n;i++)
            delete [] mx[i];
        delete [] mx;
    }
};

int main()
{
    double ** mas;
    mas = new double * [2];
    mas[0] = new double[2];
    mas[1] = new double[2];
    mas[0][0]=1;
    mas[0][1]=2;
    mas[1][0]=3;
    mas[1][1]=4;
    matrix A(2,2,mas);
    A.calcDet();
    A.showDet();
    //A.showMatrix();
    //cout << "Hello world!" << endl;
    return 0;
}