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RSS订阅原创 LeetCode437.Path Sum III
You are given a binary tree in which each node contains an integer value.Find the number of paths that sum to a given value.The path does not need to start or end at the root or a leaf, but it must go downwards (traveling only from parent nodes to child
2020-07-19 19:09:01
254
原创 LeetCode112.Path Sum
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.Note: A leaf is a node with no children.Example:Given the below binary tree and sum = 22, 5 /
2020-07-19 19:07:58
281
原创 LeetCode113.Path Sum II Python实现(详细解析以及错误展示分析)
Given a binary tree and a sum, find all root-to-leaf paths where each path’s sum equals the given sum.Note: A leaf is a node with no children.Example:Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ /
2020-07-19 19:06:30
300
原创 LeetCode160. Intersection of Two Linked Lists
Write a program to find the node at which the intersection of two singly linked lists begins.For example, the following two linked lists:begin to intersect at node c1.Example 1:Input: intersectVal = 8, listA = [4,1,8,4,5], listB = [5,6,1,8,4,5], skip
2020-07-16 17:07:41
301
原创 LeetCode104.Maximum Depth of Binary Tree
Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.Note: A leaf is a node with no children.Example:Given binary tree [3,9,20,null,null,15,7],
2020-07-16 16:59:19
259
原创 LeetCode234. Palindrome Linked List
Given a singly linked list, determine if it is a palindrome.Example 1:Input: 1->2Output: falseExample 2:Input: 1->2->2->1Output: trueExample 3:Input: 1->2->3->2->1Output: trueFollow up:Could you do it in O(n) time and
2020-07-16 16:58:22
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原创 Python中的pip更新升级
常见的pip更新升级方法为python -m pip install --upgrade pippython -m pip install -U --force-reinstall pippip install --user --upgrade pip但是以上三种方法有可能在网络不良情况下仍不行，或者有些时候出现的是‘d:\python3.6\python.exe -m pip install --user --upgrade pip’这种类似的提示，这时候仍有另外两种方法：直接使用引号里面
2020-06-19 05:57:57
716
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