HashSet | Data Structure || Java || смотреть онлайн

Hello everyone and welcome to this video about hash sets in Java.
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What is a hash set?
- A hash set is a collection in Java that stores unique elements. It is
implemented using a hash table, which is a data structure that maps
keys to values. In a hash set, the keys are the elements that are being
stored, and the values are arbitrary objects that are used to represent the
keys.

How does a hash set work?
- When an element is added to a hash set, its hash code is computed
using a hash function. The hash code is used to compute the index of the
element in the hash table. If there is no collision at that index, the
element is added to the hash table. If there is a collision, the element is
added to a linked list that is stored at that index.Find the minimum
number of problems which Chef's team needs to solve in order to get all
the balloons for problems 1 through 7 (and possibly some other balloons
too) tied next to their desk, if you know that Chef's team knows the
difficulties of all problems and solves the problems in increasing order of
difficulty.

When an element is removed from a hash set, its hash code is used to
locate the element in the hash table. If the element is found, it is removed
from the hash table. If there is a linked list at that index, the element is
removed from the linked list.

Why are hash sets useful?
- Hash sets are useful because they allow us to efficiently store and
retrieve unique elements in a collection. Because the hash function
distributes the elements evenly across the hash table, the time
complexity of adding, removing, and searching for elements in a hash set
is O(1) on average. This makes hash sets a good choice for situations
where we need to perform these operations frequently.
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