数据结构是程序设计中一个非常重要的部分,基本的数据结构包括链表、栈和队列,当然高级一点的还有树、图等,实际上链表、栈和队列都是线性表,只是在操作和表示方式上有所不同,线性表用顺序结构表示就是顺序表,用链结构表示就是链表,如果对线性表的操作加以限制,只能有在表尾进行插入和删除元素,这就变成栈了,如果只能允许元素从表尾插入,表头删除,这就变成队列了。
链表
/* * 数据结构 链表 * 链式结构 */ #include <iostream> using namespace std; enum Status { ERROR = -1, OK = 0 }; typedef int ElemType; //定义链表的节点 typedef struct LNode { ElemType data; LNode *next; } LNode, *LinkList; /* * 创建一个长度为size的单链表,并返回链表头结点 * 从后先前不断插入新的元素,每次新元素都添加到头结点后面 */ LinkList createList(int size) { if (size <= 0) return NULL; //定义头节点 LinkList list = new LNode[1]; list->next = NULL; for (int i=size; i>=1; i--) { LNode *node = new LNode[1]; cin>>node->data; node->next = list->next; list->next = node; } return list; } /* * 从链表 list 中取第 pos 个元素,并将元素值付给 elem */ Status getElem(LinkList list, int pos, ElemType &elem) { if (! list) { return Status::ERROR; } LNode *p = list->next; int j = 1; while (p && j<pos) { p = p->next; j++; } //判断是否存在第 pos 个元素,或者 pos 值输入不合法(负值或0) if (! p || j > pos) { return Status::ERROR; } elem = p->data; return Status::OK; } /* * 将元素elem插入到链表list中的第pos个位置 * 要想在第pos个位置插入元素,需要先找到第 * pos-1个位置 */ Status insertList(LinkList list, int pos, ElemType elem) { LNode *p = list; int j = 0; while (p && j<pos-1) { p = p->next; j++; } if (! p || j > pos-1) { return Status::ERROR; } LNode *node = new LNode[1]; node->data = elem; node->next = p->next; p->next = node; return Status::OK; } /* * 从链表list中删除第pos个元素,并将该元素值赋给elem * 首先找到第pos-1个元素 */ Status deleteList(LinkList list, int pos, ElemType &elem) { LNode *p = list; int j = 0; //找到第 pos-1 个元素 while (p && j<pos-1) { p = p->next; j++; } if (! p || j>pos-1 || ! p->next) { return Status::ERROR; } LNode *q = p->next; elem = q->data; p->next = q->next; delete q; return Status::OK; } /* * 合并链表list1和list2,并返回合并后的链表头结点 * list1和list2均是按值非递减排列 */ LinkList mergeList(LinkList list1, LinkList list2) { LinkList list; if (! list1 || ! list2) { list = list2==NULL ? list1 : list2; return list; } list = list1; LinkList p = list, p1 = list1->next, p2 = list2->next; while (p1 && p2) { if (p1->data <= p2->data) { p->next = p1; p1 = p1->next; } else { p->next = p2; p2 = p2->next; } p = p->next; } p->next = p1 ? p1 : p2; delete list2; return list; } void printList(LinkList list, char *str="") { cout<<str<<endl; if (list == NULL) return; LNode *p = list->next; while (p) { cout<<p->data<<" "; p = p->next; } cout<<endl; } void destroyList(LinkList list) { if (! list) { return; } while (list->next) { LNode *p = list->next; list->next = p->next; delete p; } delete list; }
栈
/* * 数据结构 栈 * 顺序结构 */ #include <iostream> #include <cstdlib> using namespace std; #define STACK_INIT_SIZE 100 #define STACK_INCREMENT 10 enum Status { ERROR = -1, OK = 0, TRUE = 1, FALSE = 2 }; typedef int ElemType; typedef struct Stack { ElemType *top;//指向栈顶元素的上一个位置 ElemType *base;//指向栈底元素 int size;//栈空间的长度 } Stack; /* * 初始化栈操作 */ Status initStack(Stack* &stack) {//此处的形参必须使用指针的引用,因为可能会改变指针本身的值,而不是其指向的对象的值 if (! stack) { stack = (Stack*)malloc(sizeof(Stack)); } stack->base = (ElemType*)malloc(STACK_INIT_SIZE * sizeof(ElemType)); if (! stack->base) { return Status::ERROR; } stack->top = stack->base; stack->size = STACK_INIT_SIZE; return Status::OK; } /* * 获取栈顶元素 */ Status getTop(Stack *stack, ElemType &elem) { if (! stack || stack->base == stack->top) { return Status::ERROR; } elem = *(stack->top-1); return Status::OK; } /* * 压入新的元素到栈顶 */ Status push(Stack *stack, ElemType elem) { if (! stack) { return Status::ERROR; } //先判断栈是否满 if (stack->top - stack->base >= stack->size) { stack->base = (ElemType*)realloc(stack->base, (stack->size+STACK_INCREMENT)*sizeof(ElemType)); if (! stack->base) { return Status::ERROR; } stack->top = stack->base + stack->size; stack->size += STACK_INCREMENT; } *stack->top = elem; stack->top++; return Status::OK; } /* * 判断栈是否为空 */ Status isEmpty(Stack *stack) { if (! stack || stack->base == stack->top) { return Status::TRUE; } return Status::FALSE; } /* * 弹出栈顶元素 */ Status pop(Stack* stack, ElemType &elem) { if (isEmpty(stack) == Status::TRUE) { return Status::ERROR; } stack->top--; elem = *stack->top; return Status::OK; } Status destroyStack(Stack *stack) { if (! stack) return Status::OK; if (stack->base) { free(stack->base); stack->base = stack->top = NULL; } return Status::OK; } void printStack(Stack *stack, char *str = "") { if (isEmpty(stack) == Status::TRUE) { return; } cout<<str<<endl; ElemType *p = stack->base; while (p != stack->top) { cout<<*p<<" "; p++; } cout<<endl; }
队列
/* * 数据结构 队列 * 链式结构 */ #include <iostream> using namespace std; enum Status { ERROR = -1, OK = 0, TRUE = 1, FALSE = 2 }; typedef int ElemType; typedef struct QNode { ElemType data; QNode* next; } QNode; typedef struct LinkQueue { QNode* front; QNode* rear; } LinkQueue; /* * 初始化队列 */ Status initQueue(LinkQueue* &queue) { if (! queue) { queue = (LinkQueue*)malloc(sizeof(LinkQueue)); } queue->front = queue->rear = (QNode*)malloc(sizeof(QNode)); if (! queue->front) { return Status::ERROR; } queue->front->next = NULL; return Status::OK; } /* * 入队 */ Status enQueue(LinkQueue* queue, ElemType elem) { if (! queue) { return Status::ERROR; } QNode* node = (QNode*)malloc(sizeof(QNode)); if (! node) { return Status::ERROR; } node->data = elem; node->next = NULL; queue->rear->next = node; queue->rear = node; return Status::OK; } /* * 判断队列是否为空 */ Status isEmpty(LinkQueue* queue) { if (! queue || queue->front == queue->rear) return Status::TRUE; return Status::FALSE; } /* * 出队 */ Status deQueue(LinkQueue* queue, ElemType &elem) { if (isEmpty(queue) == Status::TRUE) { return Status::ERROR; } QNode* p = queue->front->next; elem = p->data; queue->front->next = p->next; if (queue->rear == p) queue->rear = queue->front; free(p); return Status::OK; } /* * 销毁队列 */ Status destroyQueue(LinkQueue* queue) { if (! queue) return Status::OK; while (queue->front) { queue->rear = queue->front->next; free(queue->front); queue->front = queue->rear; } return Status::OK; } void printQueue(LinkQueue* queue, char* str) { if (isEmpty(queue) == Status::TRUE) { return; } cout<<str<<endl; QNode* p = queue->front->next; while (p) { cout<<p->data<<" "; p = p->next; } cout<<endl; }
/* * 数据结构 队列 * 顺序结构,循环队列 * 因为队列是从队头删除元素,从队尾插入元素 * 在删除元素之后,不可能让队列中的所有元素都向前移动 * 只能是将队头指针向后收缩一个位置,则前面空出了空间,为了使用这些空间 * 就需要使用循环队列,将队头和队尾连接起来,这样真正的队头并不一定就是申请 * 到的顺序空间的首地址,队尾也并不一定就是顺序空间的尾地址,所以在循环队列满了之后 * 无法使用realloc重新分配新的空间使用,因为这样会打破原来的队列结构,新的队列空间可能 * 会插入到队列的任意位置,对队列的头尾操作同样无法进行,所以只能给循环队列设置一个最大 * 队列长度,无法动态分配,如果最大长度不确定,则使用链式队列较好 */ #include <iostream> using namespace std; #define MAXSIZE 100 enum Status { ERROR = -1, OK = 0, TRUE = 1, FALSE = 2 }; typedef int ElemType; typedef struct CircleQueue { ElemType* base; int front; int rear; } CircleQueue; /* * 初始化队列 */ Status initQueue(CircleQueue* &queue) { if (! queue) { queue = (CircleQueue*)malloc(sizeof(CircleQueue)); } if (! queue) return Status::ERROR; queue->base = (ElemType*)malloc(MAXSIZE * sizeof(ElemType)); if (! queue->base) { return Status::ERROR; } queue->front = queue->rear = 0; return Status::OK; } /* * 获取队列的长度 */ int getLength(CircleQueue* queue) { if (! queue) { return 0; } return (queue->rear - queue->front + MAXSIZE) % MAXSIZE; } /* * 入队 */ Status enQueue(CircleQueue* queue, ElemType elem) {//预留一个空间不放元素,以区别队列满和空的标志 if (! queue || (queue->rear+1)%MAXSIZE == queue->front) { return Status::ERROR; } queue->base[queue->rear] = elem; queue->rear = (queue->rear + 1) % MAXSIZE; return Status::OK; } /* * 判断队列是否为空 */ Status isEmpty(CircleQueue* queue) { if (! queue || ! queue->base || queue->front == queue->rear) { return Status::TRUE; } return Status::FALSE; } /* * 出队 */ Status deQueue(CircleQueue* queue, ElemType &elem) { if (isEmpty(queue) == Status::TRUE) { return Status::ERROR; } elem = queue->base[queue->front]; queue->front = (queue->front + 1) % MAXSIZE; return Status::OK; } /* * 销毁队列 */ Status destroyQueue(CircleQueue* queue) { if (! queue) { return Status::OK; } if (queue->base) { free(queue->base); queue->base = NULL; } return Status::OK; } void printQueue(CircleQueue* queue, char* str) { if (isEmpty(queue) == Status::TRUE) return; cout<<str<<endl; int pos = queue->front; while (pos != queue->rear) { cout<<queue->base[pos]<<" "; pos = (pos+1)%MAXSIZE; } cout<<endl; }
时间: 2024-10-12 21:50:54