Tree Restoring Time limit : 2sec / Memory limit : 256MB Score : 700 points Problem Statement Aoki loves numerical sequences and trees. One day, Takahashi gave him an integer sequence of length N, a1,a2,…,aN, which made him want to construct a tree. A…
Binary Tree Restoring Time Limit: 1 Second Memory Limit: 65536 KB Special Judge Given two depth-first-search (DFS) sequences of a binary tree, can you find a binary tree which satisfies both of the DFS sequences? Recall that a binary tree i…
地址:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3965 题目: iven two depth-first-search (DFS) sequences of a binary tree, can you find a binary tree which satisfies both of the DFS sequences? Recall that a binary tree is a tree in which…
Problem Statement Aoki loves numerical sequences and trees. One day, Takahashi gave him an integer sequence of length N, a1,a2,…,aN, which made him want to construct a tree. Aoki wants to construct a tree with N vertices numbered 1 through N, such th…
source address:http://en.wikipedia.org/wiki/Red%E2%80%93black_tree A red–black tree is a type of self-balancing binary search tree, a data structure used in computer science. The self-balancing is provided by painting each node with one of two colors…
AtCoder Grand Contest 005 A - STring 翻译 给定一个只包含\(ST\)的字符串,如果出现了连续的\(ST\),就把他删去,然后所有位置前移.问最后剩下的串长. 题解 模拟栈,和维护括号一样的. #include<iostream> #include<cstring> using namespace std; #define MAX 200200 char ch[MAX]; int ans,tot; int main() { cin>>…
Atcoder/Topcoder 理论 AC Atcoder的❌游戏示范 兴致勃勃地打开一场 AGC 看 A 题,先 WA 一发,然后花了一年时间 Fix. 看 B 题,啥玩意?这能求? 睡觉觉. emmmmm 虽然这些副本里的怪一点也不友善,但是却能给直感[1]带来极大的提升. [1]:「直感」是在战斗中一瞬间判明「对自身最适合行动」的能力 Atcoder Grand Contest 2 B. Box and Ball 口胡 考虑 \(k\) 次操作后可能出现红球的集合,记录每个集合球的个数.…
AGC005 A STring 不会,有没有老鸽蕉蕉我/kk/kel/dk https://agc005.contest.atcoder.jp/submissions/7926986 B Minimum Sum 单调栈板子题 https://agc005.contest.atcoder.jp/submissions/7927292 C Tree Restoring 先得出直径\(d=\max a\),然后所有\(a\ge\frac d2\),且至少要有一条直径 还有正好取到最小值\(a\ge\f…
AGC005 A - STring 用一个栈,如果遇到S就弹入,如果遇到T栈里有S就弹出栈顶,否则T在最后的串里,最后计算出的T和栈里剩的S就是答案 #include <bits/stdc++.h> #define fi first #define se second #define pii pair<int,int> #define mp make_pair #define pb push_back #define space putchar(' ') #define enter…
在正文开始之前需要介绍一个人:Sean Sexton. 来自明尼苏达双城的软件工程师.最为出色的是他维护了两个博客:2,000Things You Should Know About C# 和 2,000 Things You Should Know About WPF .他以类似微博式的150字简短语言来每天更新一条WPF和C#重要又容易被遗忘的知识.Follow他的博客也有一段日子了,很希望能够分享给大家. 本系列我不仅会翻译他的每一个tip,也会加入自己开发之中的看法和见解.本系列我希望自…
题目链接:Balanced Binary Tree | LeetCode OJ Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more tha…
题目链接:Same Tree | LeetCode OJ Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. Tags: Depth-first Search 分析 很基本的一道深度优…
题目链接:Recover Binary Search Tree | LeetCode OJ Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing its structure. Note: A solution using O(n) space is pretty straight forward. Could you devise a constan…
题目链接:Validate Binary Search Tree | LeetCode OJ Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node's key. The right…
题目链接:Symmetric Tree | LeetCode OJ Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \ 3 4 4 3 But the following is not: 1 / \ 2 2 \ \ 3 3 Note: B…
