dfs class Solution: def sumRootToLeaf(self, root: TreeNode) -> int: stack=[(root,0)] ans=[] bi_str=[] while stack: node,level=stack.pop() s_len=len(bi_str) if s_len-1<level: bi_str.append(str(node.val)) else: bi_str[level]=str(node.val) del bi_str[l…

problem 1022. Sum of Root To Leaf Binary Numbers 参考 1. Leetcode_easy_1022. Sum of Root To Leaf Binary Numbers; 完…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 DFS 日期 题目地址:https://leetcode.com/problems/sum-of-root-to-leaf-binary-numbers/ 题目描述 Given a binary tree, each node has value 0 or 1. Each root-to-leaf path represents a binary n…

题目如下: Given a binary tree, each node has value 0 or 1.  Each root-to-leaf path represents a binary number starting with the most significant bit.  For example, if the path is 0 -> 1 -> 1 -> 0 -> 1, then this could represent 01101 in binary, wh…

网址:https://leetcode.com/problems/sum-of-root-to-leaf-binary-numbers/ 递归调用求和,同时注意%1000000007的位置 /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(…

1022. 从根到叶的二进制数之和 1022. Sum of Root To Leaf Binary Numbers 题目描述 Given a binary tree, each node has value 0 or 1. Each root-to-leaf path represents a binary number starting with the most significant bit. For example, if the path is 0 -> 1 -> 1 ->…

这是小川的第381次更新,第410篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第243题(顺位题号是1022).给定二叉树,每个节点值为0或1.每个根到叶路径表示以最高有效位开始的二进制数.例如,如果路径为0 -> 1 -> 1 -> 0 -> 1,那么这可能表示二进制的01101,即13. 对于树中的所有叶子节点,请考虑从根到该叶子节点的路径所代表的数字.返回这些数字的总和. 例如: 1 / \ 0 1 / \ / \ 0 1 0 1 输入:[1,…

Given a binary tree, each node has value 0 or 1.  Each root-to-leaf path represents a binary number starting with the most significant bit.  For example, if the path is 0 -> 1 -> 1 -> 0 -> 1, then this could represent 01101 in binary, which is…

Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). Range Sum Query 2D The above rectangle (with the red border) is defined by (row1, col1) = (…

Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which represents the number 123. Find the total sum of all root-to-leaf numbers. For example, 1 / \ 2 3…