Vector <> > Input

today, when the written test was wasted for a long time in a very small knowledge point, resulting in a written test has a problem without AC, very angry. Warning ~

Two-dimensional vector input problem:
Unlike a two-dimensional array, arr[i][j can be assigned directly to the loop. In vector<vector<int>>, because the vector is a container, the outermost vector container has a smaller vector, and the inside vector contains numbers of int. So we first have to assign a value to the vector container in the layer, and then insert the vector of the layers into the outer vector as an element. The code is as follows:

#include <iostream>
#include <vector>

using namespace std;

int main ()
{
    vector<vector<int>> test;
    Vector<int> v;
    int n,temp;

    CIN >> N;
    Test.clear ();

    Enter for (
    int i = 0; i<n; i++) {
        v.clear ();///Every time you remember clear: for
        (int j = 0; J < N; j +)
        {
            cin >> temp;
            V.push_back (temp);
        }
        Test.push_back (v);
    }

    Output for
    (int i = 0; i < n; i++)
    {for
        (int j = 0;j < n; j +)
        {
            cout << Test[i][j] < < "";
        }
        cout << Endl;
    }
    return 0;
}