#include<iostream> #include<iomanip> #include<cmath> using namespace std; int n,a[21][21],b=1,i=0; int main(){ cin>>n; while(b<=n*n){ for(int j=i;j<n-i&&b<=n*n;j++) a[i][j]=b++; for(int j=i+1;j<n-i&&b<=n*n;j++) a[j][n-i-1]=b++; for(int j=n-i-2;j>=i&&b<=n*n;j--) a[n-i-1][j]=b++; for(int j=n-i-2;j>i&&b<=n*n;j--) a[j][i]=b++; i++; } for(int j=0;j<n;j++){ for(int k=0;k<n;k++){ printf("%4d",a[j][k]); } cout<<endl; } return 0; } //Man!Ha ha ha......What can I say?Mamba out!