简单题解C++

#include<iostream>
using namespace std;
int main()
{
long long n,a,b;
char c;
cin>>n>>c;
a=n-1;
b=1;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=a;j++)
{
cout<<" ";
}
for(int j=1;j<=b;j++)
{
cout<<c;
}

    for(int j=1;j<=a;j++)
    {
        cout<<" ";
    }
    cout<<endl;
    a=a-1;
    b=b+2;
}
a=a+1;
b=b-2;
for(int i=1;i<n;i++)
{
   
    a=a+1;
    b=b-2;
    for(int j=1;j<=a;j++)
    {
        cout<<" ";
    }
    for(int j=1;j<=b;j++)
    {
        cout<<c;
    }
    
    for(int j=1;j<=a;j++)
    {
        cout<<" ";
    }
    cout<<endl;
    
}

}