D. Super M Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/592/problem/D Description Ari the monster is not an ordinary monster. She is the hidden identity of Super M, the Byteforces’ superhero. Byteforces is a country that…

题目链接: http://codeforces.com/contest/592/problem/D 题意: 给你一颗树,树上有一些必须访问的节点,你可以任选一个起点,依次访问所有的必须访问的节点,使总路程最短. 题解: 由于是树,任意两点间路径唯一,是确定的. 首先我们要先建一颗树:包括所有必须访问的节点,已经它们之间的路径. 我们选的起点一定是某个必须访问的节点,如果我们把所有的必须访问的节点访问一遍并且回到起点,那么我们用的最小花费就是边数*2(这个可以用反证法证明),所以只要我们找出新树的…

这场CF,准备充足,回寝室洗了澡,睡了一觉,可结果...   水 A - PawnChess 第一次忘记判断相等时A先走算A赢,hack掉.后来才知道自己的代码写错了(摔 for (int i=1; i<=8; ++i) { scanf ("%s", s[i]); //!!! } 数学(找规律) B - The Monster and the Squirrel 题意:多边形每个顶点向其它的点引射线,如果碰到其他射线则停止,问最后多边形被分成多少个区域 分析:搬题解: Proble…

链接: https://codeforces.com/contest/1263/problem/E 题意: The development of a text editor is a hard problem. You need to implement an extra module for brackets coloring in text. Your editor consists of a line with infinite length and cursor, which point…

C. The Big Race Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/592/problem/C Description Vector Willman and Array Bolt are the two most famous athletes of Byteforces. They are going to compete in a race with a distance of…

B. The Monster and the Squirrel Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/592/problem/B Description Ari the monster always wakes up very early with the first ray of the sun and the first thing she does is feeding her…

A. PawnChess Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/592/problem/A Description Galois is one of the strongest chess players of Byteforces. He has even invented a new variant of chess, which he named «PawnChess». Thi…

B. The Monster and the Squirrel time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Ari the monster always wakes up very early with the first ray of the sun and the first thing she does is feed…

A. PawnChess time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Galois is one of the strongest chess players of Byteforces. He has even invented a new variant of chess, which he named «PawnChe…

A. PawnChess time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Galois is one of the strongest chess players of Byteforces. He has even invented a new variant of chess, which he named «PawnChe…

C. The Big Race time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Vector Willman and Array Bolt are the two most famous athletes of Byteforces. They are going to compete in a race with a dist…

B. The Monster and the Squirrel time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Ari the monster always wakes up very early with the first ray of the sun and the first thing she does is feed…

D. Happy Tree Party Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/593/problem/D Description Bogdan has a birthday today and mom gave him a tree consisting of n vertecies. For every edge of the tree i, some number xi was w…

B. Prison Transfer Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/problemset/problem/427/B Description The prison of your city has n prisoners. As the prison can't accommodate all of them, the city mayor has decided to transfer c…

F. Cookies 链接:http://codeforces.com/contest/1099/problem/F 题意: 给你一棵树,树上有n个节点,每个节点上有ai块饼干,在这个节点上的每块饼干需要花费bi时间,有两个玩家,玩家一可以移动到当前点的子节点也可以申请游戏结束返回根节点并吃沿途的饼干,玩家二可以删除当前点到儿子节点的一条边,走路和吃饼干都消耗时间,会给出一个总时间,在总时间内尽可能的多吃饼干,问最多能吃多少个? 思路: 由于是玩家一先手,那么最开始的最大边则不会被删除,但之后路…

https://codeforces.com/contest/1136/problem/E 题意 给你一个有n个数字的a数组,一个有n-1个数字的k数组,两种操作: 1.将a[i]+x,假如a[i]+k[i]>a[i+1],则a[i+1]要变成a[i]+k[i],直到某个a[j]+k[j]<=a[j+1] 2.询问某个区间的和 题解 利用题目性质将题目转化到你会的东西的性质 令\(t_i=k_1+..+k_{i-1},b_i=a_i-t_i\) \(a_i \geq a_{i-1} + k_{…

E. Garlands 题目连接: http://www.codeforces.com/contest/707/problem/E Description Like all children, Alesha loves New Year celebration. During the celebration he and his whole family dress up the fir-tree. Like all children, Alesha likes to play with gar…

题目链接:http://codeforces.com/problemset/problem/698/B题意:告诉你n个节点当前的父节点,修改最少的点的父节点使之变成一棵有根树.思路:拆环.题解:http://codeforces.com/blog/entry/46148代码: #include <cstdio> ; int f[maxn], vis[maxn], n, s, cnt, idx; int Find(int x) { vis[x] = ++ idx; while (!vis[ f[…

题目链接:http://codeforces.com/problemset/problem/282/E E. Sausage Maximization time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The Bitlandians are quite weird people. They have their own prob…

D. Developing Game   Pavel is going to make a game of his dream. However, he knows that he can't make it on his own so he founded a development company and hired n workers of staff. Now he wants to pick n workers from the staff who will be directly r…

题意: 构造一个序列,满足m个形如:[l,r,c] 的条件. [l,r,c]表示[l,r]中的元素按位与(&)的和为c. 解法: 线段树维护,sum[rt]表示要满足到现在为止的条件时该子树的按位与和至少为多少. 更新时,如果val的pos位为1,那么整个区间的按位与和pos位也应该为1,否则与出来就不对了.(这是本题解题的核心) 那么此时更新 sum[rt] |= val 即可.然后再check一遍看是否满足所有条件即可. 代码: #include <iostream> #inclu…

D. Kay and Snowflake     After the piece of a devilish mirror hit the Kay's eye, he is no longer interested in the beauty of the roses. Now he likes to watch snowflakes. Once upon a time, he found a huge snowflake that has a form of the tree (connect…

E. Anton and Tree time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Anton is growing a tree in his garden. In case you forgot, the tree is a connected acyclic undirected graph. There are n v…

题目链接: 题目 D. Kay and Snowflake time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output 问题描述 After the piece of a devilish mirror hit the Kay's eye, he is no longer interested in the beauty of the r…

题意:n个线段[Li, Ri], m次询问, 每次询问由cnt个点组成,输出包含cnt个点中任意一个点的线段的总数. 由于是无修改的,所以我们首先应该往离线上想, 不过我是没想出来. 首先反着做,先求不包含这个cnt个点的线段的总数, 那么不包含这些点的线段必然在cnt个点之间(这里需要再加两个点一个是0, 一个是MAX), 我们可以把所有线段按Ri 分类, 然后按右端点遍历,对于当前的线段可以在Li 处+1, 然后对于每一次询问中两个点(x, y)之间线段的个数, 只需要查询 左端点大于等于x…

F. Ant colony time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Mole is hungry again. He found one ant colony, consisting of n ants, ordered in a row. Each ant i (1 ≤ i ≤ n) has a strength si…

D. Legacy time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Rick and his co-workers have made a new radioactive formula and a lot of bad guys are after them. So Rick wants to give his legacy…

D. The Bakery   Some time ago Slastyona the Sweetmaid decided to open her own bakery! She bought required ingredients and a wonder-oven which can bake several types of cakes, and opened the bakery. Soon the expenses started to overcome the income, so…

题目链接:G. New Roads 题意:给出n个结点,t层深度,每层有a[i]个结点,总共有k个叶子结点,构造一棵树. 分析: 考虑一颗树,如果满足每层深度上有a[i]结点,最多能有多少叶子结点 那么答案很简单,就是对(a[i]-1)求和再加1(每一层的结点都集中在上一层的一个结点上)   同理,我们考虑最少能有多少叶子结点,就是把上一个的答案再减去min(a[i]-1, a[i-1]-1)的求和,就是每一层的结点都尽可能的分散在上一层的结点 根据这个,那么如果要求有k个叶子节点,k在最大值与…

C. Replacement time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Daniel has a string s, consisting of lowercase English letters and period signs (characters '.'). Let's define the operation…