View Code of Problem 53

#include<cstdio>
#include<iostream>
using namespace std;
int a[20];
int main()
{
    int n;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        for(int j=0;j<n-i;j++)
            cout<<" ";
        for(int j=0;j<i*2-1;j++)
            cout<<"*";
        cout<<endl;
    }
    for(int i=n-1;i>=1;i--)
    {
        for(int j=0;j<n-i;j++)
            cout<<" ";
        for(int j=0;j<i*2-1;j++)
            cout<<"*";
        cout<<endl;
    }
    return 0;
}