C++中数据结构问题和解决方案的讨论

#include <iOStream>
using namespace std;

int main()
{
    int size;
    cout << "请输入数组的大小：";
    cin >> size;

    int *arr = new int[size];  // 动态分配内存

    for (int i = 0; i < size; i++) {
        cout << "请输入第 " << i + 1 << " 个元素：";
        cin >> arr[i];
    }

    // 对数组进行操作...

    delete[] arr;  // 释放内存

    return 0;
}

#include <iostream>
using namespace std;

struct node {
    int data;
    Node *next;
};

int main()
{
    Node *head = NULL;
    Node *current = NULL;

    int size;
    cout << "请输入链表的长度：";
    cin >> size;

    for (int i = 0; i < size; i++) {
        int val;
        cout << "请输入第 " << i + 1 << " 个节点的值：";
        cin >> val;

        Node *newNode = new Node;
        newNode->data = val;
        newNode->next = NULL;

        if (head == NULL) {
            head = newNode;
            current = head;
        } else {
            current->next = newNode;
            current = current->next;
        }
    }

    // 遍历链表并打印每个节点的值
    Node *temp = head;
    while (temp != NULL) {
        cout << temp->data << " ";
        temp = temp->next;
    }

    // 对链表进行操作...

    // 释放内存
    temp = head;
    while (temp != NULL) {
        Node *delNode = temp;
        temp = temp->next;
        delete delNode;
    }

    return 0;
}

#include <iostream>
#include <stack>
#include <queue>
using namespace std;

int main()
{
    // 使用栈
    stack<int> myStack;
    myStack.push(1);
    myStack.push(2);
    myStack.push(3);

    while (!myStack.empty()) {
        cout << myStack.top() << " ";
        myStack.pop();
    }
    cout << endl;

    // 使用队列
    queue<int> myQueue;
    myQueue.push(1);
    myQueue.push(2);
    myQueue.push(3);

    while (!myQueue.empty()) {
        cout << myQueue.front() << " ";
        myQueue.pop();
    }
    cout << endl;

    return 0;
}

#include <iostream>
#include <unordered_map>
using namespace std;

int main()
{
    unordered_map<string, int> myMap;
    myMap["Alice"] = 24;
    myMap["Bob"] = 30;
    myMap["Charlie"] = 18;

    cout << "Bob 的年龄是：" << myMap["Bob"] << endl;

    return 0;
}