题解

#include <bits/stdc++.h>
using namespace std;
int main() {
int n,a,z,m;
char c;
cin>>n>>c;
a=n;z=0;m=n2-3;
for(int i=1;i<n2;i++){

    if(i<=n){
        for(int j=1;j<a;j++)
            cout<<" ";
            cout<<"*";
        for(int j=1;j<=z;j++)
            cout<<" ";
        if(i!=1)cout<<"*";
        cout<<endl;
    }
    else{
        for(int j=0;j<=a;j++)
            cout<<" ";
            cout<<"*";
        for(int j=1;j<=z;j++)
            cout<<" ";
        if(i!=n*2-1)cout<<"*";
        cout<<endl;
    }
    if(i==1){a--;z++;}
    else if(i<=n){a--;z+=2;}
    else if(i<n*2-1){a++;z-=2;}
    else{a++;z--;}
    if(i==n)z-=4;
}
return 0;

}