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- #include <iostream>
- using namespace std;
- /*
- int recj(int n, bool firstIt=true,int x=0,int nR=0,int N=0,int offset=0){
- if(!n) return 0;
- else{
- if(firstIt){
- nR = n+1;
- N = nR/2;
- return recj(n,false,x,nR,N,offset);
- }
- cout<<((offset<x)?(char)(65 + offset):' ')<<' ';
- return recj(n-1,false,x,nR,N,offset + ((nR-n<N)?1:-1));
- }
- }
- int reci(int n,bool firstIt=true,int N=0){
- if(!n) return 0;
- else {
- if(firstIt){
- N=n;
- return reci(n,false,N);
- }
- recj(2*N-1,true,n);
- cout<<'\n';
- return reci(n-1,false,N);
- }
- }*/
- int main() {
- int n,offset=0;
- cin>>n;
- for(int i=0,x=n;i<n;i++,offset=0,x--){
- for(int j=0;j<2*n-1;j++,(offset+=(j<n)?1:-1)){
- cout<<((offset<x)?(char)(65 + offset):' ')<<' ';
- }
- cout<<endl;
- }
- //reci(n);
- return 0;
- }
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