Home; About Us. Helga Hufflepuff's Cup CodeForces - 855C 题意:给一棵n个节点的树,要给每一个节点一个附加值,附加值可以为1-m中的一个整数.要求只能有最多x个节点有附加值k.如果某个节点的附加值是k,那么与其直接相连的点的附加值都必须小于k.求给整棵树的点赋附加值时满足要求的总方案数. codeforces.com. 855C - Helga Hufflepuff's Cup 题意. April Fools' Problem (easy) [Codeforces] 721C. (medium) 樹形dp; cf codeforces round#527F. Helga Hufflepuff‘s Cup CodeForces - 855C. Nauuo and Cards CodeForces - 1172A. 栏目 C&C++. 改變路線 [Codeforces] 855C. 14 of 20 Choose Your Answer: Which Hogwarts founder are you most like? Codeforces 855 C. Helga Hufflepuff’s Cup （树形dp） ... Harry, Ron and Hermione have figured out that Helga Hufflepuff’s cup is a horcrux. Journey [TIOJ] 1995. Through her encounter with Bellatrix Lestrange, Hermione came to know that the cup is present in Bellatrix's family vault in Gringott's Wizarding Bank. Codeforces 855 C. Helga Hufflepuff’s Cup （树形dp） @ 千千 / 发表于 2017 年 09 月 27 日 / 树形DP / 1,027 次围观 Description. Fire [Codeforces] 802M. 树形DP。 Helga Hufflepuff's Cup CodeForces - 855C 题意:给一棵n个节点的树,要给每一个节点一个附加值,附加值可以为1-m中的一个整数.要求只能有最多x个节点有附加值k.如果某个节点的附加值是k,那么与其直接相连的点的附加值都必须小于k.求给整棵树的点赋附加值时满足要求的总方案数. 给你一棵树，可以染 m 种颜色，现定义一种特殊的颜色 k ，一棵树上最多能有 x 个特殊颜色。如果一个节点为特殊颜色 k ，那么他相邻的节点的值只能选比 k 小的颜色，问一共有多少种染色方案。 Journey [TIOJ] 1995. 要求构建一棵树，树上至多可以存在 \(x\) 个权值为 \(k\) 的重要点，且与重要点连边的点的权值必须小于 \(k\) ，问有多少种构树方案。 分析. 數列切割 [Codeforces] 731F. Helga Hufflepuff's Cup CodeForces - 855C 【DP】【CF855C】 Helga Hufflepuff's Cup; codeforces 802K Send the Fool Further! Helga Hufflepuff's Cup CodeForces - 855C. Helga Hufflepuff's Cup CodeForces - 855C. 木DP dp[i] := 頂点iの部分木についての何か Codeforcesで見つけた記事 全方位木DPという派生もある 二乗の木DPという、頂点集合のDPをマージする時に部分木の要素数の個数分だけ使ってマージするようにするとO(N^3)がO(N^2)に落ちるテクがある 元ネタ 木DPっぽいことをしながらマージテ … 問題概要. Video Cards [Codeforces] 463E. Helga Hufflepuff's Cup [TIOJ] 1997. bitdp + 桁DPでできそうなことがわかる(これでできないと解けないため). 给你一棵树，可以染 m 种颜色，现定义一种特殊的颜色 k ，一棵树上最多能有 x 个特殊颜色。如果一个节点为特殊颜色 k ，那么他相邻的节点的值只能选比 k 小的颜色，问一共有多少种染色方案。 Problemas do CodeForces (EXTRA) Journey, Ronda #374 (Div. Hogwarts didirikan oleh empat penyihir hebat bernama Godric Gryffindor, Salazar Slytherin, Rowena Ravenclaw, dan Helga Hufflepuff pada sekitar tahun 1000 M.Nama-nama mereka kemudian dijadikan sebagai nama asrama murid … Description. G.Counting Page Numbers [TIOJ] 1561. Contemporary Art at Home in Hamburg. G.Counting Page Numbers [TIOJ] 1561. 2), Problema C: Resolver aqui; Vasya and Array, Ronda Educational 56, Problema F: Resolver aqui; Vladik and Memorable Trip, Ronda #416 (Div. Voldemort is the only wizard known to have created more than one horcrux, and he had a total of seven horcruxes. 2), Problema C: Resolver aqui; Helga Hufflepuff's Cup, Manthan Codefest 17, Problema C: Resolver aqui 2), Problema C: Resolver aqui; Vasya and Array, Ronda Educational 56, Problema F: Resolver aqui; Vladik and Memorable Trip, Ronda #416 (Div. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 2), Problema C: Resolver aqui; Helga Hufflepuff's Cup, Manthan Codefest 17, Problema C: Resolver aqui Harry, Ron and Hermione have figured out that Helga Hufflepuff’s cup is a horcrux. [Codeforces] 864E. codeforces:Helga Hufflepuff's Cup的更多相关文章. Menu. Voldemort is the only wizard known to have created more than one horcrux, and he had a total of seven horcruxes. Journey [TIOJ] 1995. I wonder if the last link is more friendly. bitdp + 桁DPでできそうなことがわかる(これでできないと解けないため). The concept is first introduced in Harry Potter and the Half-Blood Prince, though Horcruxes are present in earlier novels without being identified as such. 桑京邀請賽 [TIOJ] 1021. 題意：給一棵n個節點的樹，要給每一個節點一個附加值，附加值可以為1-m中的一個整數。要求只能有最多x個節點有附加值k。如果某個節點的附加值是k，那麽與其直接相連的點的附加值都必須小於k。 These items include Tom Riddle’s diary, Marvolo Gaunt’s ring, Helga Hufflepuff’s cup, Salazar Slytherin’s locket, Rowena Ravenclaw’s diadem, Nagini the snake and part of Voldemort’s soul hidden in Harry Potter. 题意：给一棵n个节点的树，要给每一个节点一个附加值，附加值可以为1-m中的一个整数。要求只能有最多x个节点有附加值k。如果某个节点的附加值是k，那么与其直接相连的点的附加值都必须小于k。 2), Problema C: Resolver aqui; Helga Hufflepuff's Cup, Manthan Codefest 17, Problema C: Resolver aqui Codeforces 855 C. Helga Hufflepuff’s Cup （树形dp） 时间 2017-09-27. Codeforces 855 C. Helga Hufflepuff’s Cup （树形dp） @ 千千 / 发表于 2017 年 09 月 27 日 / 树形DP / 1,027 次围观 Description. L1-040 最佳情侣身高差 (10分) 专家通过多组情侣研究数据发现，最佳的情侣身高差遵循着一个公式：（女方的身高） \(\times 1.09 =\) （男方的身高）。 如果符合，你俩的身高差不管是牵手、拥抱、接吻，都是 … CodeForces 855 C Helga Hufflepuff's Cup 前几天的上分场的树形DP 我敢说思路和我当时想得已经一模一样了，还有半个多小时的时候，gou bi 带鱼说把题目给他看一下，然后立马得出，树形DP解不了，肯定是 … Harry, Ron and Hermione have figured out that Helga Hufflepuff’s cup is a horcrux. 改變路線 [Codeforces] 855C. Through her encounter with Bellatrix Lestrange, Hermione came to know that the cup is present in Bellatrix’s family vault in Gringott’s Wizarding Bank. Caisa and Tree The creation of a Horcrux requires one to commit a murder, which, as the supreme act of evil, "rips the… [Codeforces] 864E. ; 解法. L1-040 最佳情侣身高差 (10分) 专家通过多组情侣研究数据发现，最佳的情侣身高差遵循着一个公式：（女方的身高） \(\times 1.09 =\) （男方的身高）。 如果符合，你俩的身高差不管是牵手、拥抱、接吻，都是 … Hare. Harry, Ron and Hermione have figured out that Helga Hufflepuff's cup is a horcrux. codeforces.com. Godric Gryffindor. Harry, Ron and Hermione have figured out that Helga Hufflepuff's cup is a horcrux. What form would your patronus take? by | Feb 17, 2021 | Uncategorized | Feb 17, 2021 | Uncategorized Through her encounter with Bellatrix Lestrange, Hermione came to know that the cup is present in Bellatrix’s family vault in Gringott’s Wizarding Bank. 以下の 個のクエリを処理せよ.. 以上 以下の値について 進数表記(reading0は認めない)をして, それぞれの桁の数字の出現回数が偶数回となっているような値の個数を求めよ. Helga Hufflepuff's Cup----树形DP 时间： 2017-10-26 19:41:05 阅读： 187 评论： 0 收藏： 0 [点我收藏+] 标签： 需要 ring ble 递归 mem sizeof ces pac eof 數列切割 [Codeforces] 731F. The concept is first introduced in Harry Potter and the Half-Blood Prince, though Horcruxes are present in earlier novels without being identified as such. April Fools' Problem (easy) [Codeforces] 721C. Helga Hufflepuff's Cup CodeForces - 855C. Start studying Harry Potter Trivia. 問題概要. O loop é uma coleção de recursos de treino para as Olimpíadas Nacionais de Informática. April Fools' Problem (easy) [Codeforces] 721C. 改變路線 [Codeforces] 855C. Harry, Ron and Hermione have figured out that Helga Hufflepuff’s cup is a horcrux. bitdp + 桁DPでできそうなことがわかる(これでできないと解けないため). Linux; Network + AWS – Amazon Web Services – Cloud Primose. Description. 以下の 個のクエリを処理せよ.. 以上 以下の値について 進数表記(reading0は認めない)をして, それぞれの桁の数字の出現回数が偶数回となっているような値の個数を求めよ. Harry, Ron and Hermione have figured out that Helga Hufflepuff’s cup is a horcrux. 桑京邀請賽 [TIOJ] 1021. CF Helga Hufflepuff's Cup; JAG Tree Separator 解説; APC001 Antennas on Tree; HE Holi And Tree（子供の個数分だけ内部でDPしているからならし間に合う） HE Tree and robots （DP in 木DP） HE Forming Teams（木DP in 木DP） CF551 Serval and Rooted Tree 解説; 上級木DP. 855C - Helga Hufflepuff's Cup 题意. Fire [Codeforces] 802M. 以下の 個のクエリを処理せよ.. 以上 以下の値について 進数表記(reading0は認めない)をして, それぞれの桁の数字の出現回数が偶数回となっているような値の個数を求めよ. Our Team; Services; Remote DBA; Courses. 木DP dp[i] := 頂点iの部分木についての何か Codeforcesで見つけた記事 全方位木DPという派生もある 二乗の木DPという、頂点集合のDPをマージする時に部分木の要素数の個数分だけ使ってマージするようにするとO(N^3)がO(N^2)に落ちるテクがある 元ネタ 木DPっぽいことをしながらマージテ … Codeforces 855 C. Helga Hufflepuff’s Cup （树形dp） ... Harry, Ron and Hermione have figured out that Helga Hufflepuff’s cup is a horcrux. 题意：给一棵n个节点的树，要给每一个节点一个附加值，附加值可以为1-m中的一个整数。要求只能有最多x个节点有附加值k。如果某个节点的附加值是k，那么与其直接相连的点的附加值都必须小于k。 Harry Potter Hufflepuff Logo Drawing, Powerfull Logos, Harry Potter Hufflepuff Logo Drawing Hare. Além disso, contém vários links úteis, de repositórios de problemas e concursos interessantes. 树形DP。 數列切割 [Codeforces] 731F. 要求构建一棵树，树上至多可以存在 \(x\) 个权值为 \(k\) 的重要点，且与重要点连边的点的权值必须小于 \(k\) ，问有多少种构树方案。 分析. Helga Hufflepuff's Cup----树形DP 时间： 2017-10-26 19:41:05 阅读： 187 评论： 0 收藏： 0 [点我收藏+] 标签： 需要 ring ble 递归 mem sizeof ces pac eof Salazar Slytherin. A Horcrux is a dark magical object used to attain immortality. Helga Hufflepuff's Cup [TIOJ] 1997. [Codeforces] 864E. Harry, Ron and Hermione have figured out that Helga Hufflepuff’s cup is a horcrux. April Fools' Problem (easy) [Codeforces] 721C. Harry, Ron and Hermione have figured out that Helga Hufflepuff’s cup is a horcrux. 传送门：Codeforces 855C题意：给你一棵树，可以染m种颜色（1~m），现在定义一种特殊颜色k，一棵树上最多能有x个特殊颜色，如果一个节点为特殊颜色k，那么他相邻的节点的值只能选比k小的颜色。现在问你一共有多少种染色的方法。思路：dp[i][j][k] 表示以i为根的子树上有j个特殊颜色结点 … Badger. Video Cards [Codeforces] 463E. Helga Hufflepuff's Cup [TIOJ] 1997. 桑京邀請賽 [TIOJ] 1021. Otter. What form would your patronus take? Além disso, contém vários links úteis, de repositórios de problemas e concursos interessantes. ; 解法. CodeForces 855 C Helga Hufflepuff's Cup 前几天的上分场的树形DP 我敢说思路和我当时想得已经一模一样了，还有半个多小时的时候，gou bi 带鱼说把题目给他看一下，然后立马得出，树形DP解不了，肯定是 … Description. [Codeforces] 864E. Godric Gryffindor. Video Cards [Codeforces] 463E. 桑京邀請賽 [TIOJ] 1021. 栏目 C&C++. G.Counting Page Numbers [TIOJ] 1561. Through her encounter with Bellatrix Lestrange, Hermione came to know that the cup is present in Bellatrix’s family vault in Gringott’s Wizarding Bank. 數列切割 [Codeforces] 731F. Harry Potter Hufflepuff Logo Drawing, Powerfull Logos, Harry Potter Hufflepuff Logo Drawing Video Cards [Codeforces] 463E. Pressemitteilung; Press Release; Images: David X. Levine Problemas do CodeForces (EXTRA) Journey, Ronda #374 (Div. (medium) 樹形dp; cf codeforces round#527F. 改變路線 [Codeforces] 855C. Through her encounter with Bellatrix Lestrange, Hermione came to know that the cup is present in Bellatrix’s family vault in Gringott’s Wizarding Bank. codeforces 2000左右的dp题 题目列表; Yaroslav and Two Strings Pawn Insertion Sort Towers Two Strings Two out of Three Helga Hufflepuff's Cup Packmen New Year Letter Match & Catch Decoding Genome Work Group Treasure Hunting Cunning Gena Pathwalks Counting Arrays Wizards and Huge Prize Neko and Aki's Prank Sums of Digits Field expansion Helga Hufflepuff‘s Cup CodeForces - 855C. Helga Hufflepuff's Cup CodeForces - 855C. Helga Hufflepuff's Cup CodeForces - 855C 题意:给一棵n个节点的树,要给每一个节点一个附加值,附加值可以为1-m中的一个整数.要求只能有最多x个节点有附加值k. 改變路線 [Codeforces] 855C. G.Counting Page Numbers [TIOJ] 1561. ; 解法. Helga Hufflepuff's Cup CodeForces - 855C 【DP】【CF855C】 Helga Hufflepuff's Cup; codeforces 802K Send the Fool Further! These items include Tom Riddle’s diary, Marvolo Gaunt’s ring, Helga Hufflepuff’s cup, Salazar Slytherin’s locket, Rowena Ravenclaw’s diadem, Nagini the snake and part of Voldemort’s soul hidden in Harry Potter. April Fools' Problem (easy) [Codeforces] 721C. Caisa and Tree Fire [Codeforces] 802M. 240-461-2523 admin@bitechtraining.com. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Journey [TIOJ] 1995. [Codeforces] 864E. Helga Hufflepuff's Cup CodeForces - 855C 题意:给一棵n个节点的树,要给每一个节点一个附加值,附加值可以为1-m中的一个整数.要求只能有最多x个节点有附加值k. Codeforces 855 C. Helga Hufflepuff’s Cup （树形dp） @ 千千 / 发表于 2017 年 09 月 27 日 / 树形DP / 1,027 次围观 Description. Caisa and Tree O loop é uma coleção de recursos de treino para as Olimpíadas Nacionais de Informática. (medium) 樹形dp; cf codeforces round#527F. Helga Hufflepuff's Cup [TIOJ] 1997. Video Cards [Codeforces] 463E. 數列切割 [Codeforces] 731F. 855C - Helga Hufflepuff's Cup 题意. Badger. 桑京邀請賽 [TIOJ] 1021. Quoting the meaning of the title: G.Counting Page Numbers [TIOJ] 1561. This is an interesting model with greedy skills Reference dalao Reference 2lao. In 1997 J.K. Rowling, an unknown British author, published one of the most successful book series in history, Harry Potter. 改變路線 [Codeforces] 855C. codeforces 2000左右的dp题 题目列表; Yaroslav and Two Strings Pawn Insertion Sort Towers Two Strings Two out of Three Helga Hufflepuff's Cup Packmen New Year Letter Match & Catch Decoding Genome Work Group Treasure Hunting Cunning Gena Pathwalks Counting Arrays Wizards and Huge Prize Neko and Aki's Prank Sums of Digits Field expansion Helga Hufflepuff's Cup CodeForces - 855C 题意:给一棵n个节点的树,要给每一个节点一个附加值,附加值可以为1-m中的一个整数.要求只能有最多x个节点有附加值k.如果某个节点的附加值是k,那么与其直接相连的点的附加值都必须小于k.求给整棵树的点赋附加值时满足要求的总方案数. Helga Hufflepuff's Cup CodeForces - 855C 题意:给一棵n个节点的树,要给每一个节点一个附加值,附加值可以为1-m中的一个整数.要求只能有最多x个节点有附加值k. codeforces 2000左右的dp题 题目列表; Yaroslav and Two Strings Pawn Insertion Sort Towers Two Strings Two out of Three Helga Hufflepuff's Cup Packmen New Year Letter Match & Catch Decoding Genome Work Group Treasure Hunting Cunning Gena Pathwalks Counting Arrays Wizards and Huge Prize Neko and Aki's Prank Sums of Digits Field expansion [Codeforces] 864E. What is Hermione's patronus? 桑京邀請賽 [TIOJ] 1021. 给你一棵树，可以染 m 种颜色，现定义一种特殊的颜色 k ，一棵树上最多能有 x 个特殊颜色。如果一个节点为特殊颜色 k ，那么他相邻的节点的值只能选比 k 小的颜色，问一共有多少种染色方案。 CF438 Policeman and a Tree; 二乗の木DP 題意：給一棵n個節點的樹，要給每一個節點一個附加值，附加值可以為1-m中的一個整數。要求只能有最多x個節點有附加值k。如果某個節點的附加值是k，那麽與其直接相連的點的附加值都必須小於k。 Contém vários guias com artigos e problemas, organizados e ordenados por níveis de dificuldade, para os mais avançados mas também para quem ainda nem sequer sabe programar (é fácil). The creation of a Horcrux requires one to commit a murder, which, as the supreme act of evil, "rips the… Caisa and Tree April Fools' Problem (easy) [Codeforces] 721C. 传送门：Codeforces 855C题意：给你一棵树，可以染m种颜色（1~m），现在定义一种特殊颜色k，一棵树上最多能有x个特殊颜色，如果一个节点为特殊颜色k，那么他相邻的节点的值只能选比k小的颜色。现在问你一共有多少种染色的方法。思路：dp[i][j][k] 表示以i为根的子树上有j个特殊颜色结点 … Pureblood. codeforces:Helga Hufflepuff's Cup的更多相关文章. Fire [Codeforces] 802M. These items include Tom Riddle’s diary, Marvolo Gaunt’s ring, Helga Hufflepuff’s cup, Salazar Slytherin’s locket, Rowena Ravenclaw’s diadem, Nagini the snake and part of Voldemort’s soul hidden in Harry Potter. Select Page. Through her encounter with Bellatrix Lestrange, Hermione came to know that the cup is present in Bellatrix’s family vault in Gringott’s Wizarding Bank. G.Counting Page Numbers [TIOJ] 1561. Otter. 題意：給一棵n個節點的樹，要給每一個節點一個附加值，附加值可以為1-m中的一個整數。要求只能有最多x個節點有附加值k。如果某個節點的附加值是k，那麽與其直接相連的點的附加值都必須小於k。 Helga Hufflepuff's Cup CodeForces - 855C. 4 O'Clock Light. Além disso, contém vários links úteis, de repositórios de problemas e concursos interessantes. Caisa and Tree 數列切割 [Codeforces] 731F. Helga Hufflepuff's Cup has more of a story than was originally shown, and the magic of it was far more special than anyone could have guessed Rated: Fiction K+ - English - Family/Friendship - Helga H., OC - Words: 1,077 - Reviews: 2 - Favs: 1 - Published: 8/1/2014 - Status: Complete - id: 10585922 問題概要. Contém vários guias com artigos e problemas, organizados e ordenados por níveis de dificuldade, para os mais avançados mas também para quem ainda nem sequer sabe programar (é fácil). Helga Hufflepuff's Cup [TIOJ] 1997. CodeForces 855C Helga Hufflepuff's Cup 树形dp题意思路Code 传送门： 题意 给一棵树，有m种颜色1−m，其中x种是特殊颜色，k是特殊颜色的编号。 给一棵树，有m种颜色1 - m，其中x种是特殊颜色，k是特殊颜色的编号。 helga hufflepuff wand. Fire [Codeforces] 802M. Problemas do CodeForces (EXTRA) Journey, Ronda #374 (Div. Codeforces 855 C. Helga Hufflepuff’s Cup （树形dp） ... Harry, Ron and Hermione have figured out that Helga Hufflepuff’s cup is a horcrux. What is Hermione's patronus? Codeforces 855 C. Helga Hufflepuff’s Cup （树形dp） 时间 2017-09-27. Through her encounter with Bellatrix Lestrange, Hermione came to know that the cup is present in Bellatrix's family vault in Gringott's Wizarding Bank. Journey [TIOJ] 1995. Helga Hufflepuff's Cup----树形DP 时间： 2017-10-26 19:41:05 阅读： 187 评论： 0 收藏： 0 [点我收藏+] 标签： 需要 ring ble 递归 mem sizeof ces pac eof L1-040 最佳情侣身高差 (10分) 专家通过多组情侣研究数据发现，最佳的情侣身高差遵循着一个公式：（女方的身高） \(\times 1.09 =\) （男方的身高）。 如果符合，你俩的身高差不管是牵手、拥抱、接吻，都是 … Hogwarts School of Witchcraft and Wizardry (/ ˈ h ɒ ɡ w ɔːr t s /) is a fictional British boarding school of magic for students aged eleven to eighteen, and is the primary setting for the first six books in J. K. Rowling's Harry Potter series and serves as a major setting in the Wizarding World universe. Codeforces 855 C. Helga Hufflepuff’s Cup （树形dp） 时间 2017-09-27. O loop é uma coleção de recursos de treino para as Olimpíadas Nacionais de Informática. 栏目 C&C++. Caisa and Tree 题意：给一棵n个节点的树，要给每一个节点一个附加值，附加值可以为1-m中的一个整数。要求只能有最多x个节点有附加值k。如果某个节点的附加值是k，那么与其直接相连的点的附加值都必须小于k。 Through her encounter with Bellatrix Lestrange, Hermione came to know that the cup is present in Bellatrix’s family vault in Gringott’s Wizarding Bank. Salazar Slytherin. codeforces contest 855 problem C (tree DP) Helga Hufflepuff's Cup time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Harry, Ron and Hermione have figured out that Helga Hufflepuff's cup is a horcrux. 树形DP。 ... Helga Hufflepuff. Journey [TIOJ] 1995. CodeForces 855 C Helga Hufflepuff's Cup 前几天的上分场的树形DP 我敢说思路和我当时想得已经一模一样了，还有半个多小时的时候，gou bi 带鱼说把题目给他看一下，然后立马得出，树形DP解不了，肯定是 … A Horcrux is a dark magical object used to attain immortality. Helga Hufflepuff‘s Cup CodeForces - 855C. Helga Hufflepuff's Cup CodeForces - 855C 【DP】【CF855C】 Helga Hufflepuff's Cup; codeforces 802K Send the Fool Further! Helga Hufflepuff's Cup [TIOJ] 1997. Half blood. ... Helga Hufflepuff. Start studying Harry Potter Trivia. Helga Hufflepuff's Cup CodeForces - 855C. codeforces:Helga Hufflepuff's Cup的更多相关文章. Contém vários guias com artigos e problemas, organizados e ordenados por níveis de dificuldade, para os mais avançados mas também para quem ainda nem sequer sabe programar (é fácil). ... Helga Hufflepuff. 2), Problema C: Resolver aqui; Vasya and Array, Ronda Educational 56, Problema F: Resolver aqui; Vladik and Memorable Trip, Ronda #416 (Div. codeforces.com. 要求构建一棵树，树上至多可以存在 \(x\) 个权值为 \(k\) 的重要点，且与重要点连边的点的权值必须小于 \(k\) ，问有多少种构树方案。 分析. Video Cards [Codeforces] 463E. Fire [Codeforces] 802M.
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