题解 | #菱形图案#

#include <iostream>
using namespace std;

int main() {
    int a;
    while (cin >>a) { // 注意 while 处理多个 case
       for(int i=1;i<=2*a+1;i++){
        if(i<=a){
          for(int j=i;j<=a;j++){
            cout<<" ";
       }
          for(int m=1;m<=i;m++){
           cout<<"* ";
       }
        cout<<endl;
        }
         else{ 
            for(int j=a+2;j<=i;j++){
                cout<<" ";
            }
            for(int m=0;m<=2*a+1-i;m++){
                cout<<"* ";
            }
             cout<<endl;
         }
       }
    }
}