什么情况,本地IDE一点问题木有啊
int main()
{
    int x, y, z;
    cin >> x;
    cin >> y;
    cin >> z;
    int a, b, c;
    vector<vector<int>>A, B, C;
    vector<int> tmp1, tmp2, tmp3;
    for (int i = 0; i < x; i++)
    {

        for (int j = 0; j < y; j++)
        {
            cin >> a;
            tmp1.push_back(a);
        }
        A.push_back(tmp1);
        tmp1.clear();
    }
    for (int i = 0; i < y; i++)
    {

        for (int j = 0; j < z; j++)
        {
            cin >> b;
            tmp2.push_back(b);
        }
        B.push_back(tmp2);
        tmp2.clear();
    }
    for (int i = 0; i < x; i++)
    {

        for (int j = 0; j < z; j++)
        {
            int sum = 0;
            for (int m = 0; m < y; m++)
            {
                c = A[i][m] * B[m][j];
                sum += c;
            }
            tmp3.push_back(sum);
        }
        C.push_back(tmp3);
        tmp3.clear();
    }
    for (int i = 0; i < x; i++)
    {
        for (int j = 0; j < z - 1; j++)
            cout << C[i][j] << ' ';
        cout << C[i][z - 1];
        cout << endl;
    }
    return 0;
}