#include <vector>
#include <iostream>
 
using namespace std;
 
int main()
{
    vector<vector<int> > matrix;
    int n;
 
    cout << "Please enter the size of the identity matrix" << endl;
    cin >> n;
 
    // Initialize the matrix as a n x n array of 0.
    matrix = vector<vector<int> >(n, vector<int>(n,0));
 
    // Set the diagonal to be 1s
    for(unsigned int t = 0; t < n; t++)
        matrix[t][t] = 1;
 
    // Print it
    for(unsigned int y = 0; y < n; y++)
    {
        for(unsigned int x = 0; x < n; x++)
            cout << "\t" << matrix[y][x];
        cout << "\n";
    }
}

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