how to delete a certain amount of numbers of the same value in multiset c++

To delete a certain number of elements with the same value from a multiset in C++, you can follow these steps:

1. Initialize a multiset with the desired values. For example:

std::multiset<int> mySet = {1, 2, 2, 3, 3, 3, 4, 5, 5};

1. Specify the value you want to delete and the number of occurrences you want to remove. For example, if you want to delete two occurrences of the value 3:

int valueToDelete = 3;
int numOccurrencesToDelete = 2;

1. Use the std::multiset::erase function to remove the specified number of occurrences of the value from the multiset. The erase function takes two parameters: the value to be deleted and the number of occurrences to remove.

mySet.erase(valueToDelete, numOccurrencesToDelete);

1. After executing the erase function, the multiset will have the desired elements removed. You can iterate over the remaining elements to verify the result:

for (const auto& element : mySet) {
    std::cout << element << " ";
}

This will output:

1 2 2 3 4 5 5

Note that the erase function will delete all occurrences of the specified value if the number of occurrences to delete is greater than or equal to the number of occurrences in the multiset. If you only want to delete a certain number of occurrences, you can check the result of the erase function to see how many elements were actually removed.

That's it! This is how you can delete a certain number of elements with the same value from a multiset in C++.