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# 计算机代写|算法和结构代写Data Structures and Algorithms代考|COMP3506 Deletion

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## 计算机代写|算法和结构代写Data Structures and Algorithms代考|Deletion

Deletion from an array is the process of eliminating the value at a particular index.

Let’s return to our original example array, and delete the value at index 2 . In our example, this would be the “cucumbers”.
Step # 1: We delete “cucumbers” from the array:

While the actual deletion of “cucumbers” technically took just one step, we now have a problem: we have an empty cell sitting smack in the middle of our array. An array is not allowed to have gaps in the middle of it, so to resolve this issue, we need to shift “dates” and “elderberries” to the left.

## 计算机代写|算法和结构代写Data Structures and Algorithms代考|Sets: How a Single Rule Can Affect Efficiency

Let’s explore another data structure: the set. A set is a data structure that does not allow duplicate values to be contained within it.

There are actually different types of sets, but for this discussion, we’ll talk about an array-based set. This set is just like an array-it is a simple list of values. The only difference between this set and a classic array is that the set never allows duplicate values to be inserted into it.

For example, if you had the set [“a”, “b”, “c”] and tried to add another “b”, the computer just wouldn’t allow it, since a “b” already exists within the set.
Sets are useful when you need to ensure that you don’t have duplicate data.
For instance, if you’re creating an online phone book, you don’t want the same phone number appearing twice. In fact, I’m currently suffering from this with my local phone book: my home phone number is not just listed for myself, but it is also erroneously listed as the phone number for some family named Zirkind. (Yes, this is a true story.) Let me tell you-it’s quite annoying to receive phone calls and voicemails from people looking for the Zirkinds.

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