To access elements of a pair use the dot (.) operator. To access the elements, we use variable name followed by dot operator followed by the keyword first or second.The array of objects allocated in a map or hash_map is of type ‘pair’ by default in which all the ‘first’ elements are unique keys associated with their ‘second’ value objects. Pair can be assigned, copied, and compared.Pair provides a way to store two heterogeneous objects as a single unit. Pair is used to combine together two values that may be different in type.The first element is referenced as ‘first’ and the second element as ‘second’ and the order is fixed (first, second).A pair consists of two data elements or objects. Utility header in C++ provides us pair container. pop_back(): It is used to pop or remove elements from a 2D vector from the back.push_back(): It pushes a vector into a 2D vector from the back.empty(): Returns whether the 2D vector is empty.Getting used to handling 2D vectors in C++ helps us approach our problems. size(): Returns the number of elements in the 2D vector. This topic has a wide applications such as in graphs, or even in machine learning.Some of the functions associated with a 2D vector: It is the same as a matrix implemented with the help of vectors. In C++, a 2D vector is a vector of vectors which means that each element of a 2D vector is a vector itself. In other words, the dynamic features are the only distinction between a 2D vector and a vector array.
In 2D vectors, each vector index contains a vector that iterators can traverse and access. ISRO CS Syllabus for Scientist/Engineer Exam A 2D Vector in C++, commonly referred to as a vector of vectors, is a vector that has a changeable number of rows and each row is a different type of vector.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
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