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C++ valarray and vector are two different containers in C++ used to store and manipulate data.

Valarray: - It is a built-in container in C++ standard library. - It is designed specifically for numerical computations, particularly for speed and efficiency in large computations. - It allows element-wise operations on arrays such as addition, subtraction, multiplication, and division. - It provides certain mathematical functions like sin, cos, log, etc. which can be applied to all elements in the array. - It does not have many of the features of the vector, such as resizing and insertion/deletion of elements.

Vector: - It is a standard template library container. - It is a general-purpose container that can hold any type of data, including user-defined types. - It can dynamically resize itself to accommodate new elements. - It provides several methods for inserting and removing elements at the beginning, end, or any other position in the vector. - It does not provide the same level of efficiency for numerical computations as valarray.