The exp2() is a builtin function in C++ STL that computes the base-2 exponential function of a given number. It can also be written as 2num....

The multiset::empty() function is a built-in function in C++ STL which checks if the multiset is empty or not. It returns true if the multiset is empty, else it returns false....

Given a number n, find the ordered prime signatures and using this find the number of divisor of given n. Any positive integer, ‘n’ can be expressed in the form of its prime factors. If ‘n’ has p1, p2, … etc. as its prime factors, then n can be expressed as : Now, arrange the obtained exponents of the prime factors of ‘n’ in non-decreasing order. The arrangement thus obtained is called the ordered prime signature of the positive integer ‘n’.Example:...

std::partial_sort is used for sorting the range within the entire container. So, if we want to keep the original container intact and just copy the sorted sub-part of the container into another one, then for that purpose, we can use std::partial_sort_copy....

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std::is_sorted_until is used to find out the first unsorted element in the range [first, last). It returns an iterator to the first unsorted element in the range, so all the elements in between first and the iterator returned are sorted.It can also be used to count the total no. of sorted elements in the range. It is defined inside the header file . In case, the whole range is sorted, it will return an iterator pointing to last.It can be used in two ways as shown below:...

In C++, both set and HashSet(also called unordered_set) are used to store elements but they have different properties and use cases. In this article, we will learn the key differences between a set and a HashSet in C++....

In C++, a deque (double-ended queue) is a container that allows insertion and removal of elements from both ends whereas an unordered set is a container that stores unique elements in no particular order. In this article, we will learn how to create a deque of unordered sets in C++ STL....

Prerequisite: unordered_set() in C++...

In C++, the std::bind function is a part of the Standard Template Library (STL) and it is used to bind a function or a member function to a specific object or value. It creates a new function object by “binding” a function or member function to a specific object or value, allowing it to be called with a different number of arguments or with a different order of arguments....

A permutation, also called an “arrangement number” or “order”, is a rearrangement of the elements of an ordered list S into a one-to-one correspondence with S itself. A string of length n has n! permutation. Source: Mathword...

In C++, a pair container is defined in <utility> header that can store two values that may be of different data types so as to store two heterogeneous objects as a single unit. In this article, we will learn how to access elements of a pair in C++....