D. Roman and Numbers time limit per test 4 seconds memory limit per test 512 megabytes input standard input output standard output Roman is a young mathematician, very famous in Uzhland. Unfortunately, Sereja doesn't think so. To make Sereja change h…

D. Dima and Bacteria time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Dima took up the biology of bacteria, as a result of his experiments, he invented k types of bacteria. Overall, there a…

http://codeforces.com/contest/707/problem/D 先说一下离线和在线:在线的意思就是每一个询问单独处理复杂度O(多少多少),离线是指将所有的可能的询问先一次都处理出来,最后对于每个询问O(1)回答. 然后说一下cf的这题: D. Persistent Bookcase time limit per test 2 seconds memory limit per test 512 megabytes input standard input output st…

D. Long Path time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at th…

D. Upgrading Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You have an array of positive integers a[1], a[2], ..., a[n] and a set of bad prime numbers b1, b2, ..., bm. The prime num…

D. Minesweeper 1D time limit per test 2 seconds memory limit per test 512 megabytes input standard input output standard output Game "Minesweeper 1D" is played on a line of squares, the line's height is 1 square, the line's width is n squares. S…

D. Toy Sum time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Little Chris is very keen on his toy blocks. His teacher, however, wants Chris to solve more problems, so he decided to play a tri…

C. Unusual Product time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Little Chris is a huge fan of linear algebra. This time he has been given a homework about the unusual square of a square…

E. Inna and Binary Logic time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Inna is fed up with jokes about female logic. So she started using binary logic instead. Inna has an array of n ele…

http://codeforces.com/contest/676/problem/D 题目大意: 勇者去迷宫杀恶龙.迷宫是有n*m的方格子组成的.迷宫上有各种记号,这些记号表达着能走的方向.当且仅当两个房间的记号是相互联通的,才能走过去. 我们有如下选择,最直白的一种就是直接走到另外一个格子上去(当然格子得相互连通),第二种操作就是顺时针旋转所有的格子(格子的位置保持不变). 问,勇者要多久才能走到恶龙所在的地方. 思路: 表示这道题真心不会...下面的这个代码也是参考了别人的吧...换成我的…