返回数据而不首先在函数外部声明数组

#include <vector>

std::vector<int> getData() {
    std::vector<int> data;
    // 添加数据到数组
    data.push_back(1);
    data.push_back(2);
    data.push_back(3);
    return data;
}

int* getData() {
    int* data = new int[3];
    // 添加数据到数组
    data[0] = 1;
    data[1] = 2;
    data[2] = 3;
    return data;
}

// 调用函数并使用返回的数组
int* result = getData();
// 使用数组数据
int value1 = result[0];
int value2 = result[1];
int value3 = result[2];
// 释放内存
delete[] result;

struct Node {
    int value;
    Node* next;
};

Node* getData() {
    Node* head = new Node();
    head->value = 1;
    head->next = new Node();
    head->next->value = 2;
    head->next->next = new Node();
    head->next->next->value = 3;
    head->next->next->next = nullptr;
    return head;
}

// 调用函数并使用返回的数据结构
Node* result = getData();
// 使用数据结构中的数据
int value1 = result->value;
int value2 = result->next->value;
int value3 = result->next->next->value;
// 释放内存
Node* current = result;
while (current != nullptr) {
    Node* next = current->next;
    delete current;
    current = next;
}