C++ "Tổng tích 2 ma trận"

#include <iostream>
using namespace std;

int main(){
    int n, **A, **B, **C;
    cout << ("Nhap n = ");
    cin >> n;
    // cap phat bo nho
    A = new int*[n];
    B = new int*[n];
    C = new int*[n];
    for(int i = 0; i < n; i++){
        A[i] = new int[n];
        B[i] = new int[n];
        C[i] = new int[n];
    }
    // nhap cac phan tu
    for(int i = 0; i < n; i++)
        for(int j = 0; j < n; j++){
            cout << "A[" << i << "][" << j << "] = ";
            cin >> A[i][j];
        }
    for(int i = 0; i < n; i++)
        for(int j = 0; j < n; j++){
            cout << "B[" << i << "][" << j << "] = ";
            cin >> B[i][j];
        }
    // tinh tong ma tran
    for(int i = 0; i < n; i++)
        for(int j = 0; j < n; j++){
            C[i][j] = A[i][j] + B[i][j];
        }
    cout << "Tong hai ma tran la: \n";
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++)
            cout << C[i][j] << " ";
        cout << "\n";
    }
    // tinh tich ma tran
    for(int i = 0; i < n; i++)
        for(int j = 0; j < n; j++){
            C[i][j] = 0;
            for(int k = 0; k < n; k++)
                C[i][j] += A[i][k]*B[k][j];
        }
    cout << "Tich hai ma tran la: \n";
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++)
            cout << C[i][j] << "  ";
        cout << "\n";
    }
    return 0;
}