[置顶] 堆栈的各种算法

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各种基本算法实现小结（二）—— 堆 栈

（均已测试通过）

==============================================================

栈——数组实现

测试环境：Win - TC

 #include <stdio.h>
 char stack[512];
 int top=0;
 void push(char c)
 {
     stack[top]=c;
     top++;
 }
 char pop()
 {
     top--;
     return stack[top];
 }
 int is_empty()
 {
     return 0==top;
 }
 void main()
 {
     push('1');
     push('2');
     push('3');
     push('4');
     push('5');
     while(!is_empty())
         putchar(pop());
     putchar('/n');
     getch();
 }

运行结果：

====================================================

 

栈——数组实现2

测试环境：Win - TC

 #include <stdio.h>
 #include <malloc.h>
 /* typedef int DataType; */
 #define DataType int
 #define MAX 1024
 typedef struct
 {
     DataType data[MAX];
     int top;
 }stack, *pstack;
 pstack *init_stack()
 {
     pstack ps;
     ps=(pstack)malloc(sizeof(stack));
     if(!ps)
     {
         printf("Error. fail malloc.../n");
         return NULL;
     }
     ps->top=-1;
     return ps;
 }
 int empty_stack(pstack ps)
 {
     if(-1 == ps->top)
         return 1;
     else
         return 0;
 }
 int push(pstack ps, DataType data)
 {
     if(ps->top == MAX-1)
     {
         printf("Stack is full.../n");
         return 0;
     }
     ps->top++;
     ps->data[ps->top]=data;
     return 1;
 }
 int pop(pstack ps, DataType *data)
 {
     if(empty_stack(ps))
     {
         printf("Stack is empty.../n");
         return 0;
     }
     *data=ps->data[ps->top];
     ps->top--;
     return 1;
 }
 DataType top_stack(pstack ps)
 {
     if(empty_stack(ps))
     {
         printf("Stack is empty.../n");
         return 0;
     }
     return ps->data[ps->top];
 }
 void display(pstack ps)
 {
     int i;
     if(empty_stack(ps))
     {
         printf("Stack is empty.../n");
         return;
     }
     printf("printf the items of stack.../n");
     for(i=ps->top;i>-1;i--)
         printf("%4d", ps->data[i]);
     printf("/n/n");
 }
 void main()
 {
     int i, num, data, *pdata;
     pstack ps;
     ps=init_stack();
     printf("Enter stack num:");
     scanf("%d", &num);
     for(i=0;i<num;i++)
     {
         scanf("%d", &data);
         push(ps, data);
     }
     display(ps);
     printf("Top is %d/n/n", top_stack(ps));
     for(i=0;i<num;i++)
     {
         pop(ps, pdata);
         printf("%3d", *pdata);
     }
     printf("/n/n");
     display(ps);
     getch();
 }

运行结果：

 

====================================================

 

栈——链表实现

测试环境：Win - TC

 

 #include <stdio.h>
 #include <malloc.h>
 typedef char DataType;
 struct _node
 {
     DataType data;
     struct _node *next;
 };
 typedef struct _node node, *pstack;
 pstack init_stack()
 {
     pstack ps;
     ps=(pstack)malloc(sizeof(node));
     if(NULL == ps)
     {
         printf("Error. malloc is fail.../n");
         return NULL;
     }
     ps->data=-1;  /* base of stack: data=-1 and next=NULL */
     ps->next=NULL;
     return ps;
 }
 pstack push(pstack ps, DataType data)
 {
     pstack ptop;
     ptop=(pstack)malloc(sizeof(node));
     if(NULL == ptop)
     {
         printf("Error. malloc is fail.../n");
         return NULL;
     }
     ptop->data=data;
     ptop->next=ps;   /* insert new item */
     ps=ptop;         /* move top */
     return ps;
 }
 pstack pop(pstack ps, DataType *data)
 {
     if(ps->next == NULL)
     {
         printf("stack is empty.../n");
         return NULL;
     }
     *data=ps->data;
     ps=ps->next;
     return ps;
 }
 DataType top_stack(pstack ps)
 {
     if(ps->next == NULL)  /* if empty */
     {
         printf("stack is empty.../n");
         return -1;
     }
     return ps->data;
 }
 int len_stack(pstack ps)
 {
     int len=0;
     pstack ptop=ps;
     while(ptop->next)
     {
         len++;
         ptop=ptop->next;
     }
     return len;
 }
 void display(pstack ps)
 {
     pstack ptop;
     ptop=ps;
     while(ptop->next != NULL)
     {
         printf("%4c", ptop->data);
         ptop=ptop->next;
     }
     printf("/n/n");
 }
 void main()
 {
     pstack ps;
     DataType *data=(DataType *)malloc(sizeof(DataType));
     ps=init_stack();
     ps=push(ps, 'a');
     ps=push(ps, 'b');
     ps=push(ps, 'c');
     ps=push(ps, 'd');
     ps=push(ps, 'e');
     display(ps);
     printf("len of stack is: %d/n/n", len_stack(ps));
     printf("top of stack is: %c/n/n", top_stack(ps));
     ps=pop(ps, data);
     printf("pop %c/n",*data);
     display(ps);
     ps=pop(ps, data);
     printf("pop %c/n",*data);
     display(ps);
     getch();
 }

运行结果：

 

========================================================

 

堆 ——链表实现

测试环境：Win - TC

 #include <stdio.h>
 #include <malloc.h>
 #include <stdlib.h>
 struct _node
 {
     int data;
     struct _node *next;
 };
 typedef struct _node node, *pnode;
 struct _linkqueue
 {
     pnode front;
     pnode rear;
 };
 typedef struct _linkqueue linkqueue, *plinkqueue;
 linkqueue init_queue()
 {
     linkqueue lq;
     lq.front=lq.rear=(pnode)malloc(sizeof(node));
     if(NULL == lq.front)
     {
         printf("Error. malloc is fail.../n");
         exit(1);
     }
     lq.rear->data=lq.front->data=-1;
     lq.rear->next=lq.front->next=NULL;
     return lq;
 }
 int empty_queue(linkqueue lq)
 {
     if(lq.front == lq.rear)
         return 1;
      else
         return 0;
 }
 linkqueue insert_item(linkqueue lq, int data)
 {
     pnode pq;
     pq=(pnode)malloc(sizeof(node));
     if(pq == NULL)
     {
         printf("Error. malloc is fail.../n");
         exit(1);
     }
     pq->data=data;
     pq->next=lq.rear->next;
     lq.rear->next=pq;
     lq.rear=lq.rear->next;
     return lq;
 }
 linkqueue delete_item(linkqueue lq, int *data)
 {
     if(empty_queue(lq))
     {
         printf("queue is empty.../n");
         exit(1);
     }
     *data=lq.front->data;
     lq.front=lq.front->next;
     return lq;
 }
 int len_queue(linkqueue lq)
 {
     int len=0;
     while(lq.front)
     {
         len++;
         lq.front=lq.front->next;
     }
     return len;
 }
 void display(linkqueue lq)
 {
     linkqueue p;
     p=lq;
     if(empty_queue(lq))
     {
         printf("queue is empty.../n");
         return;
     }
     while(p.front->next)
     {
         printf("%4d", p.front->data);
         p.front=p.front->next;
     }
     printf("%4d/n/n", p.front->data);
 }
 void main()
 {
     int *data = (int *)malloc(sizeof(int));
     linkqueue lq;
     lq=init_queue();
     lq=insert_item(lq, 1);
     lq=insert_item(lq, 2);
     lq=insert_item(lq, 3);
     lq=insert_item(lq, 4);
     lq=insert_item(lq, 5);
     display(lq);
     printf("len of queue is: %d/n/n", len_queue(lq));
     lq=delete_item(lq, data);
     printf("delete %d/n", *data);
     display(lq);
     lq=delete_item(lq, data);
     printf("delete %d/n", *data);
     display(lq);
     getch();
 }

运行结果：