#include<iostream> #include<cmath> using namespace std; int main(){ char t; cin>>t; char x='A'; while(x!=char(t+1)){ int n=t-x; for(int i=1;i<=n;i++) cout<<" "; char m='A'; while(m!=x){ cout<<m; m=char(int(m+1)); } while(m!='A'){ cout<<m; m=char(int(m-1)); } cout<<m<<endl; x=char(x+1); } return 0; }c++写的