对已按平均成绩排好序的4个班的同学的构造一个所有按平均成绩的以非递增方式班内排序
平均成绩已经算好了,如何让这个链表在主函数中实现题目的意思呢,就是说template<typename T>
struct Node {
T data;
Node* next;
Node(T value) : data(value), next(nullptr) {}
};
template<typename T>
class LinkedList {
private:
Node<T>* head;
Node<T>* tail;
public:
LinkedList() : head(nullptr), tail(nullptr) {}
~LinkedList() {
while (head != nullptr) {
Node<T>* temp = head;
head = head->next;
delete temp;
}
}
void insert(T value) {
Node<T>* newNode = new Node<T>(value);
if (head == nullptr) {
head = newNode;
tail = newNode;
}
else {
tail->next = newNode;
tail = newNode;
}
}
void display() const {
Node<T>* current = head;
while (current != nullptr) {
std::cout << current->data << " -> ";
current = current->next;
}
std::cout << "nullptr" << std::endl;
}
};
void swap(double &a, double &b)
{
if (a > b)
{
double temp = a;
a =b;
b = temp;
}
}
LinkedList<int> list;
void makelist(student students[])
{
double arr1[] = { 0 };
double arr2[] = { 0 };
double arr3[] = { 0 };
double arr4[] = { 0 };
double* begin1 = arr1;
double* end1 = arr1 + sizeof(arr1) / sizeof(arr1);
double a = accumulate(begin1, end1, 0);
double* begin2 = arr2;
double* end2 = arr2 + sizeof(arr2) / sizeof(arr2);
double b = accumulate(begin2, end2, 0);
double* begin3 = arr3;
double* end3 = arr3 + sizeof(arr3) / sizeof(arr3);
double c = accumulate(begin3, end3, 0);
double* begin4 = arr4;
double* end4 = arr4 + sizeof(arr4) / sizeof(arr4);
double d = accumulate(begin4, end4, 0);
swap(a, b);
swap(b, c);
swap(c, d);
swap(a, b);
swap(b, c);
list.insert(a);
list.insert(b);
list.insert(c);
list.insert(d);
list.display();
} 要按照题目的要求对链表进行非递增排序,可以通过以下步骤实现:
1. 在`LinkedList`类中新增一个函数`sortDescending()`用于排序。在该函数内部,我们将使用插入排序的方法对链表进行排序。
2. 在`LinkedList`类中添加一个私有函数`insertNode(Node* newNode)`,该函数用于将一个节点插入到已排序的链表中,并保持链表的非递增顺序。
3. 在`sortDescending()`函数中,遍历链表中的每个节点,然后调用`insertNode()`函数将每个节点插入到已排序的部分链表中。
4. 在主函数中,创建一个`LinkedList`对象,并插入已按平均成绩排好序的节点。
下面是修改后的代码示例:
template<typename T>
struct Node {
T data;
Node* next;
Node(T value) : data(value), next(nullptr) {}
};
template<typename T>
class LinkedList {
private:
Node<T>* head;
Node<T>* tail;
public:
LinkedList() : head(nullptr), tail(nullptr) {}
~LinkedList() {
while (head != nullptr) {
Node<T>* temp = head;
head = head->next;
delete temp;
}
}
void insert(T value) {
Node<T>* newNode = new Node<T>(value);
if (head == nullptr) {
head = newNode;
tail = newNode;
}
else {
tail->next = newNode;
tail = newNode;
}
}
void display() const {
Node<T>* current = head;
while (current != nullptr) {
std::cout << current->data << " ";
current = current->next;
}
}
void sortDescending() {
if (head == nullptr || head->next == nullptr) {
return;
}
Node<T>* current = head->next;
head->next = nullptr;
while (current != nullptr) {
Node<T>* nextNode = current->next;
insertNode(current);
current = nextNode;
}
}
private:
void insertNode(Node<T>* newNode) {
if (newNode->data >= head->data) {
newNode->next = head;
head = newNode;
}
else {
Node<T>* current = head;
while (current->next != nullptr && newNode->data < current->next->data) {
current = current->next;
}
newNode->next = current->next;
current->next = newNode;
}
}
};
int main() {
LinkedList<int> list;
// 假设已经按平均成绩排好序,如:80, 75, 70, 60
list.insert(80);
list.insert(75);
list.insert(70);
list.insert(60);
list.sortDescending();
list.display();// 输出结果为:80 75 70 60
return 0;
}
在主函数中,我们首先创建一个`LinkedList`对象`list`并插入已按平均成绩排好序的4个节点。然后调用`list.sortDescending()`函数对链表进行排序,并调用`list.display()`函数来展示排序后的链表结果。最后,输出结果为`80 75 70 60`,符合题目要求的非递增顺序。
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