东方博宜1494. 奇特的三角

#include <bits/stdc++.h>

using namespace std;

int main() {

        long long m;

        cin>>m;

        for(int i=1; i<=m; i++) {

                for(int k=1;k<=m-i;k++){

                        cout<<"*";

                }

                for(int k1=1;k1<=i*2-1;k1++){

                        cout<<"@";

                }

                for(int k=1;k<=m-i;k++){

                        cout<<"*";

                }

                cout<<endl;

        }

        return 0;

}