哈夫曼树wpl计算代码
时间: 2023-12-20 08:31:44 浏览: 40
以下是Python中计算哈夫曼树WPL值的代码:
```python
import heapq
class HuffmanNode:
def __init__(self, value, freq):
self.value = value
self.freq = freq
self.left = None
self.right = None
def __lt__(self, other):
return self.freq < other.freq
def calculate_wpl(root, depth):
if not root:
return 0
if not root.left and not root.right:
return depth * root.freq
return calculate_wpl(root.left, depth + 1) + calculate_wpl(root.right, depth + 1)
def huffman_wpl(values, freqs):
nodes = []
for i in range(len(values)):
nodes.append(HuffmanNode(values[i], freqs[i]))
heapq.heapify(nodes)
while len(nodes) > 1:
left = heapq.heappop(nodes)
right = heapq.heappop(nodes)
new_node = HuffmanNode(None, left.freq + right.freq)
new_node.left = left
new_node.right = right
heapq.heappush(nodes, new_node)
root = nodes[0]
return calculate_wpl(root, 0)
# 示例
values = ['a', 'b', 'c', 'd', 'e', 'f']
freqs = [5, 9, 12, 13, 16, 45]
wpl = huffman_wpl(values, freqs)
print(wpl) # 输出:224
```