How to implement dynamic resizing of data structures using C++ STL?

Yes, dynamic resizing of data structures is possible using C++ STL containers. Containers can automatically increase or decrease in size without manual allocation of memory. Specific steps: Use std::vector to create a dynamic array. Use std::deque to create a deque. Use std::list to create a linked list.

How to use C++ STL to implement dynamic resizing of data structures?

The C++ Standard Template Library (STL) provides a series of powerful data structure containers to help us efficiently store and manage data in our programs. A key feature of these containers is the ability to dynamically adjust their size to accommodate changes in data volume without the need to manually reallocate memory.

Use std::vector to implement dynamic arrays

std::vector is a dynamic array container that will automatically increase or decrease when needed reduce its capacity.

#include <vector>

std::vector<int> myVector;

// 添加元素
myVector.push_back(1);
myVector.push_back(2);

// 访问元素
std::cout << myVector[0] << std::endl; // 输出：1

// 动态调整大小
myVector.pop_back(); // 删除最后一个元素
myVector.resize(5, 0); // 调整大小为 5，并用 0 填充新元素

Use std::deque to implement a double-ended queue

std::deque is a double-ended queue container that allows the queue to Efficiently add and remove elements from the head or tail.

#include <deque>

std::deque<int> myDeque;

// 添加元素
myDeque.push_front(1); // 在头部添加元素
myDeque.push_back(2); // 在尾部添加元素

// 访问元素
std::cout << myDeque.front() << std::endl; // 输出：1

// 动态调整大小
myDeque.pop_front(); // 删除头部元素
myDeque.resize(5, 0); // 调整大小为 5，并用 0 填充新元素

Use std::list to implement linked list

std::list is a doubly linked list container, which can be used in O(1) time Inserting and deleting elements within complexity.

#include <list>

std::list<int> myList;

// 添加元素
myList.push_front(1);
myList.push_back(2);

// 访问元素
auto it = myList.begin();
std::cout << *it << std::endl; // 输出：1

// 动态调整大小
myList.pop_back(); // 删除尾部元素
myList.resize(5, 0); // 调整大小为 5，并用 0 填充新元素

Practical case: Dynamically resized array

Suppose we have a program that needs to process an uncertain number of input values. We can use std::vector to create a dynamically resized array to store these inputs.

#include <vector>
#include <iostream>

int main() {
  std::vector<int> inputValues;

  // 读取输入值并添加到数组中
  int value;
  while (std::cin >> value) {
    inputValues.push_back(value);
  }

  // 处理输入值中的数据......

  return 0;
}

By using the dynamic resizing feature of STL, we can write concise and efficient C++ programs that easily meet the scalability needs of the data structures in the program.

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