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标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 主页 | 类别: 计算机科学 | 514 次阅读, 18861 次搜索 | 142 个单词
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Hi, here's your problem today. This problem was recently asked by Apple:
You are given a binary tree representation of an arithmetic expression. In this tree, each leaf is an integer value,, and a non-leaf node is one of the four operations: '+', '-', '*', or '/'.
Write a function that takes this tree and evaluates the expression.
Example:
This is a representation of the expression (3 + 2) * (4 + 5), and should return 45.
Here's a starting point:
标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 主页 | 类别: 计算机科学 | 514 次阅读, 18861 次搜索 | 142 个单词 You are given a binary tree representation of an arithmetic expression. In this tree, each leaf is an integer value,, and a non-leaf node is one of the four operations: '+', '-', '*', or '/'.
Write a function that takes this tree and evaluates the expression.
Example:
*
/ \
+ +
/ \ / \
3 2 4 5
This is a representation of the expression (3 + 2) * (4 + 5), and should return 45.
Here's a starting point:
class Node:
def __init__(self, val, left=None, right=None):
self.val = val
self.left = left
self.right = right
PLUS = "+"
MINUS = "-"
TIMES = "*"
DIVIDE = "/"
def evaluate(root):
# Fill this in.
tree = Node(TIMES)
tree.left = Node(PLUS)
tree.left.left = Node(3)
tree.left.right = Node(2)
tree.right = Node(PLUS)
tree.right.left = Node(4)
tree.right.right = Node(5)
print evaluate(tree)
# 45
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