#include <iostream>
using namespace std;

int main () {
    const unsigned int n = 5;
    unsigned int matrix[n][n];

    //*************************************

    unsigned int zahl=0;
    unsigned int zeile=0;
    unsigned int spalte=-1;
    unsigned int w=0;

    while(zahl<n*n){
        for(unsigned int i=0;i<n-w;i++){
            spalte ++;
            zahl++;
            matrix[zeile][spalte]=zahl;
        }
        w++;
        for(unsigned int j=0;j<n-w;j++){
            zeile++;
            zahl++;
            matrix[zeile][spalte]=zahl;
        }
        for(unsigned int k=0;k<n-w;k++){
            spalte--;
            zahl++;
            matrix[zeile][spalte]=zahl;
        }
        w++;
        for(unsigned int l=0;l<n-w;l++){
            zeile--;
            zahl++;
            matrix[zeile][spalte]=zahl;
        }
    }



    //*************************************

    for (unsigned int r = 0; r < n; ++r){
        for (unsigned int c = 0; c < n; ++c){
            if (matrix [r][c] < 10){
                cout << ' ';
            }
            cout << matrix[r][c] << ' ';
        }
        cout << endl;
    }

    return 0;
  }