动态数组

1、一维数组

    int *p1 = new int[10];  //一维数组

    //todo

    delete[] p1;

2、二维数组m*n

    int m = 10;
    int n = 5;
    int **p2 = new int*[m];
    for (int i = 0; i < m; i++){
        p2[i] = new int[n];
    }

    //todo

    for (int i = 0; i < m; i++){
        delete[] p2[i];
    }
    delete[] p2;

3、使用vector

//一维,n
    vector<int> vec1(n);
    /*for (int i = 0; i < n; i++){
        cout << vec1[i] << ends;
    }*/

//二维,m*n
    vector<vector<int> > vec2(m, vector<int>(n));