用鏈表實現隊列操作，代碼如下：

  1 #include <iostream>
  2 #include <cstdio>
  3 #include <algorithm>
  4 #include <malloc.h>
  5 
  6 using namespace std;
  7 
  8 //函數狀態碼定義
  9 #define TRUE        1
 10 #define FALSE       0
 11 #define OK          1
 12 #define ERROR       0
 13
 
 #define INFEASIBLE -1
 14 #define OVERFLOW   -2
 15 
 16 typedef int Status;
 17 typedef int QElemType;
 18 
 19 typedef struct QNode {
 20     QElemType data;
 21     struct QNode *next;
 22 }QNode, *QueuePtr;
 23 
 24 typedef struct {
 25     QueuePtr front;
 26     QueuePtr rear;
 27
 
 }LinkQueue;
 28 
 29 Status InitQueue(LinkQueue &Q) {
 30     Q.front = Q.rear = (QueuePtr)malloc(sizeof(QNode));
 31     if (!Q.front) exit(OVERFLOW);
 32     Q.front->next = NULL;
 33     return OK;
 34 }
 35 
 36 Status DestroyQueue(LinkQueue &Q) {
 37     while (Q.front) {
 
 38         cout << Q.front->data << endl;
 39         Q.rear = Q.front->next;
 40         free(Q.front);
 41         Q.front = Q.rear;
 42     }
 43     return OK;
 44 }
 45 
 46 Status EnQueue(LinkQueue &Q, QElemType e) {
 47     Q.rear->next = (QueuePtr)malloc(sizeof(QNode));
 48     if (!Q.rear->next) exit(OVERFLOW);
 49     Q.rear->data = e;
 50     Q.rear = Q.rear->next;
 51     Q.rear->next = NULL;
 52     return OK;
 53 }
 54 
 55 Status DeQueue(LinkQueue &Q, QElemType &e) {
 56     if (Q.front == Q.rear)
 57         return ERROR;
 58     e = Q.front->data;
 59     QueuePtr p = Q.front;
 60     Q.front = Q.front->next;
 61     free(p);
 62     return OK;
 63 }
 64 
 65 bool EmptyQueue(LinkQueue &Q) {
 66     return Q.front == Q.rear;
 67 }
 68 
 69 int main()
 70 {
 71     LinkQueue A, B;
 72     InitQueue(A);
 73     InitQueue(B);
 74     int n, m;
 75     cin >> n;
 76     for (int i = 0; i < n; ++i) {
 77         cin >> m;
 78         if (m & 1)
 79             EnQueue(A, m);
 80         else
 81             EnQueue(B, m);
 82     }
 83     bool ok = false;
 84     while (!EmptyQueue(A) && !EmptyQueue(B)) {
 85         DeQueue(A, m);
 86         if (ok)
 87             cout << ‘ ‘ << m;
 88         else
 89             cout << m;
 90 
 91         if (!EmptyQueue(A)) {
 92             DeQueue(A, m);
 93                 cout << ‘ ‘ << m;
 94         }
 95         DeQueue(B, m);
 96         cout << ‘ ‘ << m;
 97         ok = true;
 98     }
 99     while (!EmptyQueue(A)) {
100         DeQueue(A, m);
101         if (ok)
102             cout << ‘ ‘ << m;
103         else
104             cout << m;
105         ok = true;
106     }
107     while (!EmptyQueue(B)) {
108         DeQueue(B, m);
109         if (ok)
110             cout << ‘ ‘ << m;
111         else
112             cout << m;
113         ok = true;
114     }
115     return 0;
116 }

PTA 7-1 銀行業務隊列簡單模擬