triangle of 0 and 1

class Main {
    public static void main(String[] args) {
        int n = 5;
        int cv = 1;
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= i; j++){
                System.out.print(cv);
                if(cv == 1){
                    cv = 0;
                }
                else{
                    cv = 1;
                }
            }
            System.out.println();
        }
    }
}