OI-Codes/XSMOJ/数字菱形.cpp

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