Java在跳过列表中实现删除方法

Question

The delete method for my skip list is going in an infinite loop! I followed the pseudo code from this website http://www.mathcs.emory.edu/~cheung/Courses/323/Syllabus/Map/skip-list-impl.html . The other methods seems to be working fine except the delete. This is my code:

public void delete(String k) {
    SkipListEntry p = findEntry(k);

    if (p.key != k) {
        return; // Not found, don't remove
    }

    while (p != null) {
        //need to delete the entry from each list using the "up" or "down" links
        p.left.right = p.right;
        p.right.left = p.left;  
    }
}

This is my entire code http://pastebin.com/StJRzixN
Thanks

Answer 1

You're missing a step in delete .

Before the recursive call, you need to assign p the value of p.up .

Otherwise, you sit on the lowest tiered p and just keep adjusting the neighbors' right and left pointers.