做项目时经常遇到树状层级数据.从各个层级数据的转换查询等.场景如行业类别的多层级,行政区层级,检查项类别层级等等. 数据结构如 Id Name ParentId #region area树状节点的转化 public List<Area> ConvertToLeafChildAreas(List<int> areaIds) { var allAreas = GetNewAreas().ToList(); List<Area> leafChildren = new Lis
C. Kefa and Park time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Kefa decided to celebrate his first big salary by going to the restaurant. He lives by an unusual park. The park is a roote
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. Note: A leaf is a node