872.leaf

Description

Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a leaf value sequence.

https://s3-lc-upload.s3.amazonaws.com/uploads/2018/07/16/tree.png

For example, in the given tree above, the leaf value sequence is (6, 7, 4, 9, 8).

Two binary trees are considered leaf-similar if their leaf value sequence is the same.

Return true if and only if the two given trees with head nodes root1 and root2 are leaf-similar.

题目链接:https://leetcode.com/problems/leaf-similar-trees/

Difficulty: easy

Note:

  • Both of the given trees will have between 1 and 100 nodes.

分析

  1. updating

参考代码

Definition for a binary tree node.
class TreeNode:
    def __init__(self, x):
        self.val = x
        self.left = None
        self.right = None

class Solution:
def leafSimilar(self, root1, root2):
    li1=[]
    li2=[]
    def _int(root):
        if(root==None):
            return
        else:
            if(root.left == None):
                if(root.right == None):
                    li1.append(root.val)
                    return
                else:
                    _int(root.right)
            else:
                _int(root.left)
                if(root.right != None):
                    _int(root.right)
    def _int2(root):
        if(root==None):
            return
        else:
            if(root.left == None):
                if(root.right == None):
                    li2.append(root.val)
                    return
                else:
                    _int2(root.right)
            else:
                _int2(root.left)
                if(root.right != None):
                    _int2(root.right)
    _int(root1)
    _int2(root2)
    print('li1',li1)
    print('li2',li2)
    if(li1 == li2):
        return True
    return False