数据结构之栈和队列

1.栈

 1 #include <cstdio>
 2 #include <iostream>
 3 using namespace std;
 4 const int stack_size = 10;
 5 const int ex_size = 1;
 6 typedef struct{
 7     int *base, *top;
 8     int size;
 9 }stack;
10 void init(stack &s){
11     s.base = s.top = new int[stack_size];
12     s.size = stack_size;
13 }
14 int length(stack &s){
15     return s.top - s.base;
16 }
17 void ex_stack(stack &s){
18     s.size += ex_size;
19     int *p = s.base, *t = new int[s.size];
20     int len = length(s); s.base = t;
21     for(int i = 0; i < len; ++i) *t++ = p[i];
22     s.top = t;
23     delete[] p;
24 }
25 void destroy(stack &s){
26     delete[] s.base;
27     s.base = s.top = NULL;
28     s.size = -1;
29 }
30 void clear(stack &s){
31     s.top = s.base;
32 }
33 bool empty(stack &s){
34     if(s.top == s.base) return true;
35     return false;
36 }
37 void push(stack &s, int x){
38     if(length(s) == s.size) ex_stack(s);
39     *s.top++ = x;
40 }
41 void pop(stack &s){
42     if(empty(s)) return;
43     --s.top;
44 }
45 int *get(stack &s){
46     if(empty(s)) return NULL;
47     return s.top-1;
48 }
49 void display(stack &s){
50     if(empty(s)) cout << "stack is empty!";
51     else for(int *p = s.base; p != s.top; ++p) cout << *p << " ";
52     cout << endl;
53 }
54 int main(){
55     stack s; init(s);
56     for(int i = 0; i < 10; ++i) push(s,i);
57     display(s); push(s,10); display(s);
58     pop(s); display(s); cout << *get(s) << endl;
59     clear(s); cout << "len = " << length(s) << endl;
60     destroy(s); if(s.size == -1 && !s.base && !s.top) cout << "Successful destruction." << endl;
61     return 0;
62 }
My_stack.cpp

2.队列

 1 #include <cstdio>
 2 #include <iostream>
 3 using namespace std;
 4 typedef struct Node{
 5     int x;
 6     struct Node *next;
 7 }node;
 8 typedef struct{
 9     node *front, *rear;
10     int length;
11 }queue;
12 void init(queue &q){
13     node *t = new node;
14     t->x = 0;
15     t->next = NULL;
16     q.front = q.rear = t;
17     q.length = 0;
18 }
19 void del(queue &q, node *h){
20     if(h == NULL) return;
21     del(q,h->next);
22     delete h;
23     h = NULL;
24 }
25 void destroy(queue &q){
26     del(q,q.front);
27     q.front = q.rear = NULL;
28     q.length = -1;
29 }
30 void clear(queue &q){
31     q.rear = q.front;
32     q.length = 0;
33 }
34 bool empty(queue &q){
35     if(q.length) return false;
36     return true;
37 }
38 int *get(queue &q){
39     if(empty(q)) return NULL;
40     return &(q.front->x);
41 }
42 void push(queue &q, int x){
43     q.rear->x = x;
44     ++q.length;
45     if(q.rear->next == NULL){
46         node *t = new node;
47         t->x = 0; t->next = NULL;
48         q.rear->next = t;
49     }
50     q.rear = q.rear->next;
51 }
52 void pop(queue &q){
53     node *p = q.front->next;
54     delete q.front;
55     q.front = p;
56     --q.length;
57 }
58 void display(queue &q){
59     if(empty(q)) cout << "Queue is empty!";
60     else for(node *p = q.front; p != q.rear; p = p->next) cout << p->x << " ";
61     cout << endl;
62 }
63 int main(){
64     queue q; init(q);
65     for(int i = 0; i < 10; ++i) push(q,i);
66     display(q); cout << *get(q) << endl;
67     pop(q); display(q);
68     clear(q); cout << q.length << endl;
69     destroy(q); if(q.length == -1 && !q.front && !q.rear) cout << "Successful destruction." << endl;
70     return 0;
71 }
My_queue.cpp

 3.循环队列

 1 #include <cstdio>
 2 #include <iostream>
 3 using namespace std;
 4 const int maxn = 10;//仅能装下maxn - 1个元素。
 5 typedef struct{
 6     int *base;
 7     int front, rear;
 8 }squeue;
 9 void init(squeue &q, int max_len){
10     int *p = new int[max_len];
11     if(!p) return;
12     q.base = p;
13     q.front = q.rear = 0;
14 }
15 int length(squeue &q){
16     return (q.rear - q.front + maxn) % maxn;
17 }
18 bool empty(squeue &q){
19     if(q.rear == q.front) return true;
20     return false;
21 }
22 bool full(squeue &q){
23     if((q.rear + 1) % maxn == q.front) return true;
24     return false;
25 }
26 void push(squeue &q, int x){
27     if(full(q)) return;
28     q.base[q.rear] = x;
29     q.rear = (q.rear + 1) % maxn;
30 }
31 void pop(squeue &q){
32     if(empty(q)) return;
33     q.front = (q.front + 1) % maxn;
34 }
35 int get(squeue &q){
36     return q.base[q.front];
37 }
38 void next(int &i){
39     ++i;
40     if(i == maxn) i = 0;
41 }
42 void display(squeue &q){
43     if(empty(q)) return;
44     for(int i = q.front; i != q.rear; next(i)) cout << q.base[i] << " ";
45     cout << endl;
46 }
47 int main(){
48     squeue q; init(q,maxn);
49     for(int i = 0; i < 9; ++i) push(q,i);
50     display(q); pop(q); pop(q); push(q,9);
51     display(q);
52 }
My_squeue.cpp

 

posted @ 2017-09-18 17:45  Posase  阅读(262)  评论(0编辑  收藏  举报