题解 | 牛牛的字符菱形

//非常好用，简单易懂
#include <iostream>
using namespace std;

int main() {
    char a;
   cin>>a;
   cout<<"  "<<a<<endl;
   cout<<" "<<a<<a<<a<<endl;
   cout<<a<<a<<a<<a<<a<<endl;
   cout<<" "<<a<<a<<a<<endl;
   cout<<"  "<<a;
   return 0;
}