翔鸽

摘要： 1047 Student List for Course Zhejiang University has 40,000 students and provides 2,500 courses. Now given the registered course list of each student, 阅读全文

摘要： 1053 Path of Equal Weight 给定一个非空的树，树根为 RR。 树中每个节点 TiTi 的权重为 WiWi。 从 RR 到 LL 的路径权重定义为从根节点 RR 到任何叶节点 LL 的路径中包含的所有节点的权重之和。 现在给定一个加权树以及一个给定权重数字，请你找出树中所有的权 阅读全文

摘要： 1004 Counting Leaves A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. Input Sp 阅读全文

摘要： 1094 The Largest Generation A family hierarchy is usually presented by a pedigree tree where all the nodes on the same level belong to the same genera 阅读全文

摘要： 1090 Highest Price in Supply Chain A supply chain is a network of retailers（零售商）, distributors（经销商）, and suppliers（供应商）-- everyone involved in moving 阅读全文

摘要： 1079 Total Sales of Supply Chain A supply chain is a network of retailers（零售商）, distributors（经销商）, and suppliers（供应商）– everyone involved in moving a p 阅读全文

摘要： 1102 Invert a Binary Tree The following is from Max Howell @twitter: Google: 90% of our engineers use the software you wrote (Homebrew), but you can’t 阅读全文

摘要： 1086 Tree Traversals Again An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6 阅读全文

摘要： 1020 Tree Traversals Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, y 阅读全文

摘要： 1098 Insertion or Heap Sort According to Wikipedia: Insertion sort iterates, consuming one input element each repetition, and growing a sorted output 阅读全文