习题2-3 倒三角形-----《竞赛算法入门指导》

#include <iostream>
using namespace std;
int main()
{
    int n,i,j;
    cin>>n;
    for(i=n-1;i>=0;i--)
    {
        for(j=0;j<n-(i+1);j++){
            cout<<‘ ‘;
        }
            
        for(j=n-(i+1);j<n+i;j++){
            cout<<‘#‘;
        }
            
        for(j=n+i;j<2*n;j++){
            cout<<‘ ‘;
        }
        cout<<endl;
        cout<<endl;
    }
    return 0;
}