2D array input, output, total sum, sum by row

#include <iostream>
#define MAXN 10
using namespace std;

void input_2d(int &n, int &m, int a[][MAXN]) {
    cin >> n >> m;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> a[i][j];
        }
    }
}

void output_2d(int &n, int &m, int a[][MAXN]) {

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cout << a[i][j] << " ";
        }
        cout << endl;
    }
}

int sum_2d(int n, int m, int a[][MAXN]) {
    int sum = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            sum += a[i][j];
        }
    }

    return sum;
}

void sum_2d_rows(int n, int m, int a[][MAXN], int sums[]) {
    for (int i = 0; i < n; i++) {
        sums[i] = 0;
        for (int j = 0; j < m; j++) {
            sums[i] += a[i][j];
        }
    }

}



int main() {

    int a[MAXN][MAXN], n, m, sum[MAXN];
    input_2d(n, m, a);
    output_2d(n, m, a);
    cout << sum_2d(n, m, a) << endl;
    sum_2d_rows(n, m, a, sum);
    for (int i = 0; i < n; i++)
    {
        cout << sum[i] << " ";
    }

    cout << endl;
    return 0;
}