# include<iostream> using namespace std; int main(){ int n, i=0; way=1, x=0, y=0, juzhen[21][21]={0}; cin>>n; for(; i <= n*n; i++){ juzhen[y][x]=i; if(way==1){ x++; if(x>=n||juzhen[y][x]!=0){ x--; way++; continue; } }else if(way==2){ y++; if(y>=n||juzhen[y][x]!=0){ y--; way++; continue; } }else if(way==3){ x--; if(y<0||juzhen[y][x]!=0){ x++; way++; continue; } }else if(way==4){ y--; if(y<0||juzhen[y][x]!=0){ y++; way=1; continue; } } i++; } for(int a = 0; a < n; a++){ for(int j = 0; j < n; j++)cout<<juzhen[a][j]<<" "; cout<<endl; } return 0; }