假设Q[0..6]是一个循环队列,初始状态为front=rear=0,画出做完下列操作后队列的头尾指针的状态变化情况,若不能入队,请指出其元素,并说明理由。 d,e入队;d出队;i,j,k,m入队;n,o,p入队
时间: 2023-08-22 18:07:47 浏览: 135
循环队列的初始化、入队、队列长度、取队头元素、出队、遍历等基本操作
循环队列的基本操作包括入队和出队,循环队列相比于普通队列的特点是可以循环利用空间,避免空间浪费。假设Q[0..6]是一个循环队列,初始状态为front=rear=0,接下来进行一系列操作,分别为d,e入队,d出队,i,j,k,m入队,n,o,p入队。根据这些操作,队列的状态变化如下所示:
1. d入队后,队列状态为:
```
+---+---+---+---+---+---+---+
| d | | | | | | |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
2. e入队后,队列状态为:
```
+---+---+---+---+---+---+---+
| d | e | | | | | |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
3. d出队后,队列状态为:
```
+---+---+---+---+---+---+---+
| | e | | | | | |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
4. i入队后,队列状态为:
```
+---+---+---+---+---+---+---+
| | e | i | | | | |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
5. j入队后,队列状态为:
```
+---+---+---+---+---+---+---+
| | e | i | j | | | |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
6. k入队后,队列状态为:
```
+---+---+---+---+---+---+---+
| | e | i | j | k | | |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
7. m入队后,队列状态为:
```
+---+---+---+---+---+---+---+
| | e | i | j | k | m | |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
8. n入队后,队列状态为:
```
+---+---+---+---+---+---+---+
| n | e | i | j | k | m | |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
9. o入队后,队列状态为:
```
+---+---+---+---+---+---+---+
| n | e | i | j | k | m | o |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
10. p入队后,队列状态为:
```
+---+---+---+---+---+---+---+
| n | e | i | j | k | m | o |
+---+---+---+---+---+---+---+
↑ ↑
front rear
```
此时队列已经满了,再入队无法成功。
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