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; }