Blogpost: [C++] 巢狀迴圈與圖形輸出 C0

#include<iostream>
using namespace std;
int main(){
    int a;
    while(cin>>a){
        for(int i=1;i<=a;i++){
            for(int j=1;j<=a-i;j++){
                cout<<" ";
            }
            for(int k=1;k<=2*i-1;k++){
                cout<<"$";
            }
            cout<<endl;
        }
    }
    return 0;
}