public class genlist<T>{
        public T[] data;
        public int size=0,capacity;
        public genlist(int c=1){ capacity=c; data = new T[capacity]; }
	public T this[int i] => data[i];
        public void add(T item){
		if(size==capacity){
                	T[] newdata = new T[capacity*=2];
                	for(int i=0;i<size;i++)newdata[i]=data[i];
			data = newdata;
			}
                data[size]=item;
                size++;
        }
}