#include<bits/stdc++.h>
using namespace std;
int n,a[99999999],sum;
int main()
{
    cin>>n;
    for (int i=1;sum<=n*n;i++)
    {
        cin>>a[i];
        sum+=a[i];
    }
    int shu=0;
    for (int i=1;i<=n;i++)
    {
        
        if (i%2==1)
        {
            for (int j=1;j<=a[i];j++)
            {
                cout<<"0";
                shu++;
                if (shu==n)
                {
                    cout<<endl;
                    shu=0;
                }
            } 
        }
        else
        {
            for (int j=1;j<=a[i];j++)
            {
                cout<<"1";
                shu++;
                if (shu==n)
                {
                    cout<<endl;
                    shu=0;
                }
            }
        }
    }
    return 0;
}
```//对一半