C++实现基于vector的矩阵乘法

#include 
#include 
using namespace std;

int main() {
    int m;
    int n;
    cin>>m>>n;
    vector> matrix_a(m);
    vector> matrix_b(n);
    int input;
    for (int i = 0; i < m; ++i) {
        for (int j = 0; j < n; ++j) {
            cin >> input;
            matrix_a[i].push_back(input);
        }
    }

    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            cin >> input;
            matrix_b[i].push_back(input);
        }
    }
    
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < m; j++) {
            int s = 0;
            for (int k = 0; k < n; k++) {
                s = s + matrix_a[i][k] * matrix_b[k][j];
            }
            if(j != 0) {
                cout << " " ;
            }
            cout << s;
        }
        cout << endl;
    }
    return 0;
}