Lights Out time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Lenny is playing a game on a 3 × 3 grid of lights. In the beginning of the game all lights are switched on. Pressing any of the l…

A. Lights Out 模拟. B. Convex Shape 考虑每个黑色格子作为起点,拐弯次数为0的格子构成十字形,拐弯1次的则是从这些格子出发直走达到的点,显然需要遍历到所有黑色黑色格子. C. k-Multiple Free Set 对于每组\(x.kx.k^2x.\cdots\),设个数为\(c\),那么最多可以取\(\lfloor \frac{c+1}{2} \rfloor\)个. D. Zero Tree 考虑一个节点,其所有儿子节点均为叶节点,那么加法\减法操作可以一起做,显…

A. Lights Out 模拟. B. Convex Shape 考虑每个黑色格子作为起点,拐弯次数为0的格子构成十字形,拐弯1次的则是从这些格子出发直走达到的点,显然需要遍历到所有黑色黑色格子. C. k-Multiple Free Set 对于每组\(...x.kx.k^2x.\cdots\),设个数为\(c\),那么最多可以取\(\lfloor \frac{c+1}{2} \rfloor\)个. D. Zero Tree 考虑一个节点,其所有儿子节点均为叶节点,那么加法\减法操作可以一起…

Codeforces Round #366 (Div. 2) A I hate that I love that I hate it水题 #I hate that I love that I hate it n = int(raw_input()) s = "" a = ["I hate that ","I love that ", "I hate it","I love it"] for i in ran…

Codeforces Round #354 (Div. 2) Problems     # Name     A Nicholas and Permutation standard input/output 1 s, 256 MB    x3384 B Pyramid of Glasses standard input/output 1 s, 256 MB    x1462 C Vasya and String standard input/output 1 s, 256 MB    x1393…

直达–>Codeforces Round #368 (Div. 2) A Brain’s Photos 给你一个NxM的矩阵,一个字母代表一种颜色,如果有”C”,”M”,”Y”三种中任意一种就输出”#Color”,如果只有”G”,”B”,”W”就输出”#Black&White”. #include <cstdio> #include <cstring> using namespace std; const int maxn = 200; const int INF =…

 cf之路,1,Codeforces Round #345 (Div. 2) ps:昨天第一次参加cf比赛,比赛之前为了熟悉下cf比赛题目的难度.所以做了round#345连试试水的深浅.....       其实这个应该是昨天就写完的,不过没时间了,就留到了今天.. 地址:http://codeforces.com/contest/651/problem/A A. Joysticks time limit per test 1 second memory limit per test 256…

Codeforces Round #279 (Div. 2) 做得我都变绿了! Problems     # Name     A Team Olympiad standard input/output 1 s, 256 MB  x2377 B Queue standard input/output 2 s, 256 MB  x1250 C Hacking Cypher standard input/output 1 s, 256 MB  x740 D Chocolate standard in…

Codeforces Round #262 (Div. 2) 1003 C. Present time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Little beaver is a beginner programmer, so informatics is his favorite subject. Soon his info…

Codeforces Round #262 (Div. 2) 1004 D. Little Victor and Set time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Little Victor adores the sets theory. Let us remind you that a set is a group of…