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vector - C++ Users Instead, vector containers may allocate some extra storage to accommodate for possible growth, and thus the container may have an actual capacity greater than the storage strictly needed to contain its elements (i e , its size)
C++ STL vector容器详解 - C语言中文网 vector 常被称为 向量容器,因为该容器擅长在尾部插入或删除元素,在常量时间内就可以完成,时间复杂度为 O(1);而对于在容器头部或者中部插入或删除元素,则花费时间要长一些(移动元素需要耗费时间),时间复杂度为线性阶 O(n)。
std:: vector - cppreference. com The storage of the vector is handled automatically, being expanded as needed Vectors usually occupy more space than static arrays, because more memory is allocated to handle future growth
Vector in C++ STL - GeeksforGeeks A vector represents a dynamic sized array in the Standard Template Library (STL) that automatically grows when elements are added beyond current capacity A programmer does not have to worry about maintaining the capacity and allocating extra space initially