일단... 삭제는 방법이 2개 있다. 1. Delete location known2. Delete with search (애는 search running time 와서 합치는 식이다) When we want to delete something, there are two possibilities:We already know where the element/node isWe only know the key/value, so we must search first So the running time changes depending on whether:we know the locationor we must search by key firstAndin an array, “location known” means ..