#include<bits/stdc++.h> using namespace std; int main() { int n; cin>>n; int c=n; n=2*n-1; for(int i=1;i<=n;i++) { int cnt=1; for(int j=1;j<=n;j++) { if(abs(i-c)+abs(j-c)<c) { cout<<cnt; cnt++; } else { cout<<" "; } } cout<<endl; } return 0; }
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