A. Robot Sequence time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output Calvin the robot lies in an infinite rectangular grid. Calvin's source code contains a list of n commands, each either 'U'…

A. Robot Sequence time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Calvin the robot lies in an infinite rectangular grid. Calvin's source code contains a list of n commands, each either 'U'…

  A. Robot Sequence   time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Calvin the robot lies in an infinite rectangular grid. Calvin's source code contains a list of n commands, each either…

A. Robot Sequence 题目连接: http://www.codeforces.com/contest/626/problem/A Description Calvin the robot lies in an infinite rectangular grid. Calvin's source code contains a list of n commands, each either 'U', 'R', 'D', or 'L' - instructions to move a…

A. Robot Sequence time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Calvin the robot lies in an infinite rectangular grid. Calvin's source code contains a list of n commands, each either 'U'…

Codeforces 601B. Lipshitz Sequence 题意:,q个询问,每次询问给出l,r,求a数组[l,r]中所有子区间的L值的和. 思路:首先要观察到,斜率最大值只会出现在相邻两点上,因此可以处理出d数组,d[i]=a[i]-a[i-1].则问题转化为求d数组在指定区间内,所有子区间的最大值的和.枚举子区间的复杂度是平方级别,显然是不能接受的,所以可以用单调栈预处理出每个d[i]可以成为最大值的最大区间(形象地说,也就是d[i]为最大值的域可以延伸到左.右各多远),用l,r数…

time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output The Professor has lost his home robot yet again. After some thinking Professor understood that he had left the robot in the basement. The ba…

https://codeforces.com/problemset/problem/407/C (自用,勿看) 手模一下找一找规律,可以发现,对于一个修改(l,r,k),相当于在[l,r]内各位分别加上[1,0,0,0,0,..]做k+1次前缀和得到的数组 比如(l=3,r=6,k=2),[1,0,0,..]做k+1=3次前缀和后为[1,3,6,10,15,..],因此这次修改相当于a[l]+=1,a[l+1]+=3,a[l+2]+=6,a[l+3]+=10 很容易想到k从大到小排序,用差分维护…

Pushok the dog has been chasing Imp for a few hours already. Fortunately, Imp knows that Pushok is afraid of a robot vacuum cleaner. While moving, the robot generates a string t consisting of letters 's' and 'h', that produces a lot of noise. We defi…

A. Infinite Sequence time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Consider the infinite sequence of integers: 1, 1, 2, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 5.... The sequence is built in the…