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数据结构
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顺序表
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顺序表的形式
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顺序表的结构与实现
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顺序表的操作
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<b>2.4.</b>
Python中的顺序表
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链表
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<b>3.1.</b>
单向链表
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<b>3.2.</b>
单项循环链表
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<b>3.3.</b>
双向链表
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栈
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<b>4.1.</b>
栈结构实现
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<b>5.</b>
队列
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队列的实现
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<b>5.2.</b>
双端队列
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排序与搜索
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<b>6.1.</b>
冒泡排序
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<b>6.2.</b>
选择排序
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<b>6.3.</b>
插入排序
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快速排序
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<b>6.5.</b>
希尔排序
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<b>6.6.</b>
归并排序
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常见排序算法效率比较
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搜索
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树与树算法
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二叉树
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二叉树的遍历
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<section class="normal" id="section-">
<h1 id="队列的实现">队列的实现</h1>
<p>同栈一样，队列也可以用顺序表或者链表实现。</p>
<h3 id="操作">操作</h3>
<ul>
<li>Queue() 创建一个空的队列</li>
<li>enqueue(item) 往队列中添加一个item元素</li>
<li>dequeue() 从队列头部删除一个元素</li>
<li>is_empty() 判断一个队列是否为空</li>
<li>size() 返回队列的大小</li>
</ul>
<pre><code class="lang-Python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Queue</span><span class="hljs-params">(object)</span>:</span>
<span class="hljs-string">"""队列"""</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self)</span>:</span>
self.items = []
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">is_empty</span><span class="hljs-params">(self)</span>:</span>
<span class="hljs-keyword">return</span> self.items == []
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">enqueue</span><span class="hljs-params">(self, item)</span>:</span>
<span class="hljs-string">"""进队列"""</span>
self.items.insert(<span class="hljs-number">0</span>,item)
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">dequeue</span><span class="hljs-params">(self)</span>:</span>
<span class="hljs-string">"""出队列"""</span>
<span class="hljs-keyword">return</span> self.items.pop()
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">size</span><span class="hljs-params">(self)</span>:</span>
<span class="hljs-string">"""返回大小"""</span>
<span class="hljs-keyword">return</span> len(self.items)
<span class="hljs-keyword">if</span> __name__ == <span class="hljs-string">"__main__"</span>:
q = Queue()
q.enqueue(<span class="hljs-string">"hello"</span>)
q.enqueue(<span class="hljs-string">"world"</span>)
q.enqueue(<span class="hljs-string">"itcast"</span>)
<span class="hljs-keyword">print</span> q.size()
<span class="hljs-keyword">print</span> q.dequeue()
<span class="hljs-keyword">print</span> q.dequeue()
<span class="hljs-keyword">print</span> q.dequeue()
</code></pre>
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