Dima the hamster enjoys nibbling different things: cages, sticks, bad problemsetters and even trees! Recently he found a binary search tree and instinctively nibbled all of its edges, hence messing up the vertices. Dima knows that if Andrew, who has…
http://codeforces.com/contest/1025/problem/D D. Recovering BST time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Dima the hamster enjoys nibbling different things: cages, sticks, bad problems…
从这里开始 题目列表 瞎扯 Problem A Doggo Recoloring Problem B Weakened Common Divisor Problem C Plasticine zebra Problem D Recovering BST Problem E Colored Cubes Problem F Disjoint Triangles Problem G Company Acquisitions 瞎扯 打比赛,发现自己特别菜. 居然还苟且水上紫名 这个号不敢玩了.要努力学习…
Codeforces Round #505 A. Doggo Recoloring 题目描述:给定一个字符串,每次选择一个在字符串里面出现至少两次的字符,然后将这种字符变成那一种指定的字符,问最终这个字符串能否只剩一种字符. solution 当长度为\(1\)是,答案是\(Yes\),当长度大于\(1\)时,如果有字符至少出现两次,则答案为\(Yes\). 时间复杂度:\(O(n)\) B. Weakened Common Divisor 题目描述:有\(n\)个数对,定义这\(n\)个数对的…
Given a root node reference of a BST and a key, delete the node with the given key in the BST. Return the root node reference (possibly updated) of the BST. Basically, the deletion can be divided into two stages: Search for a node to remove. If the n…
Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in the same or another comput…
Given a binary tree, find the largest subtree which is a Binary Search Tree (BST), where largest means subtree with largest number of nodes in it. Note:A subtree must include all of its descendants.Here's an example: 10 / \ 15 / \ \ 1 8 7 The Largest…
Given a binary search tree and a node in it, find the in-order successor of that node in the BST. Note: If the given node has no in-order successor in the tree, return null. 这道题让我们求二叉搜索树的某个节点的中序后继节点,那么我们根据BST的性质知道其中序遍历的结果是有序的, 是我最先用的方法是用迭代的中序遍历方法,然后用…
Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Follow up: What if the BST is modified (insert/delete operations) often and you nee…
Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Follow up:What if the BST is modified (insert/delete operations) often and you need…
本人最近被各种数据结构的实验折磨的不要不要的,特别是代码部分,对数据结构有严格的要求,比如写个BST要分成两个类,一个节点类,要给树类,关键是所以操作都要用函数完成,也就是在树类中不能直接操作节点,需要使用节点类中的函数来实现各种操作. 简直太麻烦,但是花时间写了也是有好处的,认真写完绝对几年忘不了.同时用函数操作数据也更安全,将数据设为私有成员更符合规范.下面给出代码. #include<iostream> using namespace std; class BinNode { priva…
Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Follow up: What if the BST is modified (insert/delete operations) often and you nee…
Given a binary search tree and a node in it, find the in-order successor of that node in the BST. 本题要求查找p在树中的inorder successor(中序遍历时的下一个节点).根据p和root的关系,有三种情况. 1. p在root的左子树中: 1.1 p在左子树中的successor不为空,那么输出这个successor 1.2 p在左子树中的successor为空,那么p的successo…
Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in the same or another comput…
前言: 节主要是给出BST,AVL和红黑树的C++代码,方便自己以后的查阅,其代码依旧是data structures and algorithm analysis in c++ (second edition)一书的作者所给,关于这3中二叉树在前面的博文算法设计和数据结构学习_4(<数据结构和问题求解>part4笔记)中已经有所介绍.这里不会去详细介绍它们的实现和规则,一是因为这方面的介绍性资料超非常多,另外这3种树的难点都在插入和删除部分,其规则本身并不多,但是要用文字和图形解释其实还蛮耗…
