#include <iostream> #include <cstdio> #include <iomanip> using namespace std; int a[25][25]; int main() { int n; cin>>n; int x=1,y=1,s=0; a[x][y]=1; s++; while (s<n*n) { while (y+1<=n&&a[x][y+1]==0){ a[x][++y]=++s; } while (x+1<=n&&a[x+1][y]==0){ a[++x][y]=++s; } while (y-1>=1&&a[x][y-1]==0) { a[x][--y]=++s; } while (x-1>=1&&a[x-1][y]==0){ a[--x][y]=++s; } } for (int i=1;i<=n;i++) { for (int j=1;j<=n;j++){ cout<<setw(4)<<a[i][j]; } cout<<endl; } return 0; }