#include<bits/stdc++.h> using namespace std; int main(){ int n,a[20][20]; cin>>n; for(int i=0;i<n;i++){ for(int j=0;j<n;j++){ a[i][j]=1; } } for(int i=0;i<=n/2;i++){ for(int j=0;j<=n/2;j++){ a[i][n/2-i]=0; a[i][n/2+i]=0; a[n/2+j][j]=0; a[n/2+j][n-1-j]=0; } } a[n/2][n/2]=0; for(int i=0;i<n;i++){ for(int j=0;j<n;j++){ cout<<setw(3)<<a[i][j]; } cout<<endl; } return 0; } /************************************************************** Problem: 1327 User: laichenxu Language: C++ Result: Accepted Time:9 ms Memory:2072 kb ****************************************************************/