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cs4/CPP5/作业5.cpp

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+#include<stdio.h>
+#include<stdlib.h>
+#include<time.h>
+
+typedef struct Node
+{
+	int data;
+	Node* next;
+} Node;
+
+// 链式基数排序
+Node* radixSort(Node* head)
+{
+	if (head == NULL) return NULL;
+	int max = head->data;
+	Node* current = head;
+	while (current != NULL)
+	{
+		if (current->data > max)  max = current->data;
+		current = current->next;
+	}
+	// 基数排序
+	for (int exp = 1; max / exp > 0; exp *= 10)
+	{
+		Node* buckets[10] = { NULL };
+		Node* tails[10] = { NULL };
+		current = head;
+		while (current != NULL)
+		{
+			Node* next = current->next; // 保存下一个节点
+			current->next = NULL;       // 断开，防止形成环或错连
+
+			int digit = (current->data / exp) % 10;
+			if (buckets[digit] == NULL)
+			{
+				buckets[digit] = current;
+				tails[digit] = current;
+			}
+			else
+			{
+				tails[digit]->next = current;
+				tails[digit] = current;
+			}
+			current = next;
+		}
+		Node* newHead = NULL;
+		Node* newTail = NULL;
+		for (int i = 0; i < 10; i++)
+		{
+			if (buckets[i] != NULL)
+			{
+				if (newHead == NULL)
+				{
+					newHead = buckets[i];
+					newTail = tails[i];
+				}
+				else
+				{
+					newTail->next = buckets[i];
+					newTail = tails[i];
+				}
+			}
+		}
+		if (newTail != NULL)
+			newTail->next = NULL;
+		head = newHead;
+	}
+	return head;
+}
+
+int main()
+{
+	srand((unsigned int)time(NULL));
+	Node* head = NULL;
+	for (int i = 0; i < 100000; i++)
+	{
+		Node* newNode = (Node*)malloc(sizeof(Node));
+		newNode->data = rand() % 100;
+		newNode->next = head;
+		head = newNode;
+	}
+	printf("链表已创建！\n");
+	double clock1 = clock();
+	head = radixSort(head);
+	double clock2 = clock();
+	printf("排序完成:\n");
+	printf("排序时间: %f 秒\n", (double)(clock2 - clock1) / CLOCKS_PER_SEC);
+	return 0;
+}