Merge pull request #253 from Gonglja/master

Add my_list, linkedlist_stack codes in C

codes/c/CMakeLists.txt

@@ -10,4 +10,5 @@ add_subdirectory(chapter_computational_complexity)
 add_subdirectory(chapter_array_and_linkedlist)
 add_subdirectory(chapter_sorting)
 add_subdirectory(chapter_tree)
+add_subdirectory(chapter_stack_and_queue)
 add_subdirectory(chapter_heap)

codes/c/chapter_array_and_linkedlist/CMakeLists.txt

@@ -1,2 +1,3 @@
 add_executable(array array.c)
 add_executable(linked_list linked_list.c)
+add_executable(my_list my_list.c)

codes/c/chapter_array_and_linkedlist/my_list.c

@@ -0,0 +1,159 @@
+/**
+ * File: list.c
+ * Created Time: 2022-01-12
+ * Author: Zero (glj0@outlook.com)
+ */
+
+#include "../include/include.h"
+
+
+// 用数组实现 list
+struct mylist {
+    int* nums;       // 数组（存储列表元素）
+    int capacity;    // 列表容量
+    int size;        // 列表大小
+    int extendRatio; // 列表每次扩容的倍数
+};
+
+typedef struct mylist MyList;
+/* 前置声明 */
+void extendCapacity(MyList *list);
+
+/* 构造函数 */
+void newMyList(MyList *list) {
+    list->capacity = 10;
+    list->nums = malloc(sizeof(int) * list->capacity);
+    list->size = 0;
+    list->extendRatio = 2;
+}
+
+/* 析构函数 */
+void delMyList(MyList *list) {
+    list->size = 0;
+    free(list->nums);
+}
+
+/* 获取列表长度 */
+int size(MyList *list) {
+    return list->size;
+}
+
+/* 获取列表容量 */
+int capacity(MyList *list) {
+    return list->capacity;
+}
+
+/* 访问元素 */
+int get(MyList *list, int index) {
+    assert(index < list->size);
+    return list->nums[index];
+}
+
+/* 更新元素 */
+void set(MyList *list, int index, int num) {
+    assert(index < list->size);
+    list->nums[index] = num;
+}
+
+/* 尾部添加元素 */
+void add(MyList *list, int num) {
+    if (size(list) == capacity(list)) {
+        extendCapacity(list); // 扩容
+    }
+    list->nums[size(list)] = num;
+    list->size++;
+}
+
+/* 中间插入元素 */
+void insert(MyList *list, int index, int num) {
+    assert(index < size(list));
+    for (int i = size(list); i > index; --i) {
+      list->nums[i] = list->nums[i-1];
+    }
+    list->nums[index] = num;
+    list->size++;
+}
+
+/* 删除元素 */
+// 由于引入了 stdio.h ，此处无法使用 remove 关键词
+// 详见 https://github.com/krahets/hello-algo/pull/244#discussion_r1067863888
+int removeNum(MyList *list, int index) {
+    assert(index < size(list));
+    int num = list->nums[index];
+    for (int i = index; i < size(list) - 1; i++) {
+        list->nums[i] = list->nums[i+1];
+    }
+    list->size--;
+    return num;
+}
+
+/* 列表扩容 */
+void extendCapacity(MyList *list) {
+    // 先分配空间
+    int newCapacity = capacity(list) * list->extendRatio;
+    int *extend = (int *)malloc(sizeof(int) * newCapacity);
+    int *temp = list->nums;
+
+    // 拷贝旧数据到新数据
+    for(int i = 0; i < size(list); i++)
+        extend[i] = list->nums[i];
+
+    // 释放旧数据
+    free(temp);
+
+    // 更新新数据
+    list->nums = extend;
+    list->capacity = newCapacity;
+}
+
+/* 将列表转换为 Array 用于打印 */
+int* toArray(MyList *list) {
+    return list->nums;
+}
+
+int main() {
+    /* 初始化列表 */
+    MyList list;
+    newMyList(&list);
+    /* 尾部添加元素 */
+    add(&list, 1);
+    add(&list, 3);
+    add(&list, 2);
+    add(&list, 5);
+    add(&list, 4);
+    printf("列表 list = ");
+    printArray(toArray(&list), size(&list));
+    printf("容量 = %d ，长度 = %d\r\n", capacity(&list), size(&list));
+
+    /* 中间插入元素 */
+    insert(&list, 3, 6);
+    printf("在索引 3 处插入数字 6 ，得到 list = ");
+    printArray(toArray(&list), size(&list));
+
+    /* 删除元素 */
+    removeNum(&list, 3);
+    printf("删除索引 3 处的元素，得到 list = ");
+    printArray(toArray(&list), size(&list));  
+
+    /* 访问元素 */
+    int num = get(&list, 1);
+    printf("访问索引 1 处的元素，得到 num = %d\r\n", num);
+
+    /* 更新元素 */
+    set(&list, 1, 0);
+    printf("将索引 1 处的元素更新为 0 ，得到 list = ");
+    printArray(toArray(&list), size(&list));
+
+    /* 测试扩容机制 */
+    for (int i = 0; i < 10; i++) {
+        // 在 i = 5 时，列表长度将超出列表容量，此时触发扩容机制
+        add(&list, i);
+    }
+
+    printf("扩容后的列表 list = ");
+    printArray(toArray(&list), size(&list));
+    printf("容量 = %d ，长度 = %d\r\n", capacity(&list), size(&list));
+
+    /* 析构函数，释放分配内存 */
+    delMyList(&list);
+}

codes/c/chapter_stack_and_queue/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_executable(array_stack array_stack.c)
+add_executable(linkedlist_stack linkedlist_stack.c)

codes/c/chapter_stack_and_queue/array_stack.c

@@ -0,0 +1,43 @@
+/**
+ * File: array_stack.c
+ * Created Time: 2022-01-12
+ * Author: Zero (glj0@outlook.com)
+ */
+
+#include "../include/include.h"
+
+
+struct ArrayStack {
+    int *array;
+    size_t stkSize;
+};
+
+typedef struct ArrayStack ArrayStack;
+
+void new(ArrayStack* stk) {
+
+}
+
+size_t size(ArrayStack* stk) {
+
+}
+
+bool empty(ArrayStack* stk) {
+
+}
+
+void push(ArrayStack* stk, int num) {
+
+}
+
+void pop(ArrayStack* stk) {
+
+}
+
+int top(ArrayStack* stk) {
+
+}
+
+int main() {
+    return 0;
+}

codes/c/chapter_stack_and_queue/linkedlist_stack.c

@@ -0,0 +1,110 @@
+/**
+ * File: linkedlist_stack.c
+ * Created Time: 2022-01-12
+ * Author: Zero (glj0@outlook.com)
+ */
+
+#include "../include/include.h"
+
+/* 基于链表实现的栈 */
+struct LinkedListStack {
+    ListNode* stackTop; // 将头结点作为栈顶
+    int size;           // 栈的长度
+};
+
+typedef struct LinkedListStack LinkedListStack;
+
+/* 构造函数 */
+void newLinkedListStack(LinkedListStack* stk) {
+    stk->stackTop = NULL;
+    stk->size = 0;
+}
+
+/* 析构函数 */
+void delLinkedListStack(LinkedListStack* stk) {
+    while(stk->stackTop) {
+        ListNode *n = stk->stackTop->next;
+        free(stk->stackTop);
+        stk->stackTop = n;
+    }
+    stk->size = 0;
+}
+
+/* 获取栈的长度 */
+int size(LinkedListStack* stk) {
+    assert(stk);
+    return stk->size;
+}
+
+/* 判断栈是否为空 */
+bool empty(LinkedListStack* stk) {
+    assert(stk);
+    return size(stk) == 0;
+}
+
+/* 访问栈顶元素 */
+int top(LinkedListStack* stk) {
+    assert(stk);
+    assert(size(stk) != 0); 
+    return stk->stackTop->val;
+}
+
+/* 入栈 */
+void push(LinkedListStack* stk, int num) {
+    assert(stk);
+    ListNode *node = (ListNode *)malloc(sizeof(ListNode));
+    node->next = stk->stackTop; // 更新新加结点指针域
+    node->val = num;            // 更新新加结点数据域
+    stk->stackTop = node;       // 更新栈顶
+    stk->size++;             // 更新栈大小
+}
+
+/* 出栈 */
+void pop(LinkedListStack* stk) {
+    assert(stk);
+    int num = top(stk);
+    ListNode *tmp = stk->stackTop;
+    stk->stackTop = stk->stackTop->next;
+    // 释放内存
+    free(tmp);
+    stk->size--;
+}
+
+/* Driver Code */
+int main() {
+    /* 初始化栈 */
+    LinkedListStack stack;
+    /* 构造函数 */
+    newLinkedListStack(&stack);
+
+    /* 元素入栈 */
+    push(&stack, 1);
+    push(&stack, 3);
+    push(&stack, 2);
+    push(&stack, 5);
+    push(&stack, 4);
+
+    printf("栈 stack = ");
+    printLinkedList(stack.stackTop);
+
+    /* 访问栈顶元素 */
+    int stackTop = top(&stack);
+    printf("栈顶元素 top = %d\r\n", stackTop);
+
+    /* 元素出栈 */
+    pop(&stack);
+    printf("出栈元素 pop = %d, 出栈后 stack =  ", stackTop);
+    printLinkedList(stack.stackTop);
+
+    /* 获取栈的长度 */
+    int stackSize = size(&stack);
+    printf("栈的长度 size = %d\r\n", stackSize);
+
+    /* 判断是否为空 */
+    bool isEmpty = empty(&stack);
+    printf("栈是否为空 = %s\r\n", isEmpty ? "yes" : "no");
+
+    /* 析构函数 */
+    delLinkedListStack(&stack);
+    return 0;
+}

codes/c/include/include.h

@@ -12,6 +12,7 @@
 #include <string.h>
 #include <stdbool.h>
 #include <time.h>
+#include <assert.h>
 
 #include "list_node.h"
 #include "tree_node.h"