find with hash set

To find an element in a hash set in C++, you can follow these steps:

Create a hash set: Start by creating a hash set using the unordered_set container from the C++ Standard Library. This container uses a hash function to efficiently store and retrieve elements.
Insert elements: Insert the desired elements into the hash set using the insert() function. Each element will be hashed and stored in the appropriate bucket.
Find an element: To find a specific element in the hash set, use the find() function. This function takes the value you want to find as an argument and returns an iterator pointing to the element if it is found. If the element is not found, the iterator returned by find() will be equal to the end() iterator.
Check if the element was found: Compare the iterator returned by find() with the end() iterator to determine if the element was found. If the iterators are equal, it means the element was not found. Otherwise, the element was found.

Here's an example that demonstrates these steps:

#include <iostream>
#include <unordered_set>

int main() {
    // Step 1: Create a hash set
    std::unordered_set<int> hashSet;

    // Step 2: Insert elements
    hashSet.insert(10);
    hashSet.insert(20);
    hashSet.insert(30);

    // Step 3: Find an element
    auto it = hashSet.find(20);

    // Step 4: Check if the element was found
    if (it != hashSet.end()) {
        std::cout << "Element found: " << *it << std::endl;
    } else {
        std::cout << "Element not found" << std::endl;
    }

    return 0;
}

In this example, we create a hash set hashSet and insert three elements (10, 20, and 30) into it. We then use the find() function to search for the element 20. If the element is found, we print a message indicating that it was found along with its value. Otherwise, we print a message indicating that it was not found.

When you run this code, the output will be:

Element found: 20

This confirms that the element 20 was successfully found in the hash set.