B. Anton and Lines   The teacher gave Anton a large geometry homework, but he didn't do it (as usual) as he participated in a regular round on Codeforces. In the task he was given a set of n lines defined by the equations y = ki·x + bi. It was necess…

B. Anton and Lines Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/593/problem/B Description The teacher gave Anton a large geometry homework, but he didn't do it (as usual) as he participated in a regular round on Codeforc…

E. Anton and Ira Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/584/problem/E Description Anton loves transforming one permutation into another one by swapping elements for money, and Ira doesn't like paying for stupid game…

题目传送门 /* 题意:从前面找一个数字和末尾数字调换使得变成偶数且为最大 贪心:考虑两种情况:1. 有偶数且比末尾数字大(flag标记):2. 有偶数但都比末尾数字小(x位置标记) 仿照别人写的,再看自己的代码发现有清晰的思维是多重要 */ #include <cstdio> #include <iostream> #include <algorithm> #include <cmath> #include <cstring> #include…

Codeforces Round #297 (Div. 2)C. Ilya and Sticks Time Limit: 2 Sec  Memory Limit: 256 MBSubmit: xxx  Solved: 2xx 题目连接 http://codeforces.com/contest/525/problem/C Description In the evening, after the contest Ilya was bored, and he really felt like ma…

推迟了15分钟开始,B卡住不会,最后弃疗,rating只涨一分...   水(暴力枚举) A - 2Char /************************************************ * Author :Running_Time * Created Time :2015/11/4 星期三 21:33:17 * File Name :A.cpp ************************************************/ #include <cstd…

D. Anton and School - 2 题目连接: http://codeforces.com/contest/785/problem/D Description As you probably know, Anton goes to school. One of the school subjects that Anton studies is Bracketology. On the Bracketology lessons students usually learn differ…

E. Anton and Tree 题目连接: http://codeforces.com/contest/734/problem/E Description Anton is growing a tree in his garden. In case you forgot, the tree is a connected acyclic undirected graph. There are n vertices in the tree, each of them is painted bla…

D. Anton and Chess 题目连接: http://codeforces.com/contest/734/problem/D Description Anton likes to play chess. Also, he likes to do programming. That is why he decided to write the program that plays chess. However, he finds the game on 8 to 8 board to…

C. Anton and Making Potions 题目连接: http://codeforces.com/contest/734/problem/C Description Anton is playing a very interesting computer game, but now he is stuck at one of the levels. To pass to the next level he has to prepare n potions. Anton has a…

B. Anton and Digits 题目连接: http://codeforces.com/contest/734/problem/B Description Recently Anton found a box with digits in his room. There are k2 digits 2, k3 digits 3, k5 digits 5 and k6 digits 6. Anton's favorite integers are 32 and 256. He decide…

A. Anton and Danik 题目连接: http://codeforces.com/contest/734/problem/A Description Anton likes to play chess, and so does his friend Danik. Once they have played n games in a row. For each game it's known who was the winner - Anton or Danik. None of th…

题目链接: http://codeforces.com/contest/734/problem/D D. Anton and Chess time limit per test4 secondsmemory limit per test256 megabytes 问题描述 Anton likes to play chess. Also, he likes to do programming. That is why he decided to write the program that pla…

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…

C. Anton and Fairy Tale 题目连接: http://codeforces.com/contest/785/problem/C Description Anton likes to listen to fairy tales, especially when Danik, Anton's best friend, tells them. Right now Danik tells Anton a fairy tale: "Once upon a time, there liv…

B. Anton and Classes 题目连接: http://codeforces.com/contest/785/problem/B Description Anton likes to play chess. Also he likes to do programming. No wonder that he decided to attend chess classes and programming classes. Anton has n variants when he wil…

A - Anton and Polyhedrons 题目连接: http://codeforces.com/contest/785/problem/A Description Anton's favourite geometric figures are regular polyhedrons. Note that there are five kinds of regular polyhedrons: Tetrahedron. Tetrahedron has 4 triangular face…

题目链接:http://codeforces.com/contest/734/problem/E 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…

题目链接:http://codeforces.com/contest/734/problem/D D. Anton and Chess time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Anton likes to play chess. Also, he likes to do programming. That is why…

题目链接:http://codeforces.com/contest/734/problem/C C. Anton and Making Potions time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Anton is playing a very interesting computer game, but now he i…

D. Happy Tree Party     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 written on it. In case you forget, a tree is a connected non-directed graph without cycles. After…

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…

C. Anton and Making Potions time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Anton is playing a very interesting computer game, but now he is stuck at one of the levels. To pass to the next…

A. 2Char Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/593/problem/A Description Andrew often reads articles in his favorite magazine 2Char. The main feature of these articles is that each of them uses at most two distinc…

B. Anton and currency you all know time limit per test 0.5 seconds memory limit per test 256 megabytes input standard input output standard output Berland, 2016. The exchange rate of currency you all know against the burle has increased so much that…

http://codeforces.com/blog/entry/50996 官方题解讲得很明白,在这里我复述一下. 枚举每个左括号,考虑计算一定包含其的简单括号序列的个数,只考虑其及其左侧的左括号,以及其右侧的右括号.最后答案就是其之和. 可以将其提取出来这样((((((())),红色为当前左括号.设有x个左,y个右 要注意,这个答案为C(x+y-1,x),来证明. 我们只需证明,这个答案与长度为x+y-1的,包含x个1的零一序列的种类数相等即可. 随便写一个这样的零一序列,长度为x+y,但当…

E. Anton and Permutation time limit per test 4 seconds memory limit per test 512 megabytes input standard input output standard output Anton likes permutations, especially he likes to permute their elements. Note that a permutation of n elements is a…

题意: 给你n对 b[i], c[i], 让你求a[i],不存在输出-1 b[i] = (a[i] and a[1]) + (a[i] and a[2]) + (a[i] and a[3]) +...+ (a[i] and a[n]); c[i] = (a[i] or a[1]) + (a[i] or a[2]) + (a[i] or a[3]) +...+ (a[i] or a[n]); and 和 or 是按位与 或 思路: (a and b) + (a or b) = (a + b) 证明…

题意: 给一颗树 每个节点有黑白2色 可以使一个色块同事变色,问最少的变色次数. 思路: 先缩点 把一样颜色的相邻点 缩成一个 然后新的树 刚好每一层是一个颜色. 最后的答案就是树的直径/2 不过我用的树上的dp,强行求了以每个点为根时树的深度 答案就是最小的深度-1 具体见代码: + ; int n; int color[maxn]; int pa[maxn]; vector<int> G[maxn], G2[maxn]; void init() { scanf("%d"…

题目很简单,只需要注意带空格的输入用getline即可 #include <iostream> #include <vector> #include <algorithm> #include <string> #include <set> using namespace std; int main(){ string str; getline(cin,str); set<char> a; ; i < str.length()-;…