题目链接 Problem - C - Codeforces 题目 Example input 3 2 4 3 a* 4 1 3 a**a 6 3 20 **a*** output abb abba babbbbbbbbb 题意 n--字符串长度, k--每个星号最多代表k个b ,  x--第x小的字符串s的子串(可以是不连续子串) 每一个星号可以换成0~k个b,  需要求出第x小的字符串s的子串. 题解 a****a***a**(连续的星号指两个a或者边缘之间夹的星号, 可以为1) 从后面往前看…

A. Cut Ribbon \(f(i)\)表示长为\(i\)的布条最多可以剪几段. B. Counting Rhombi \(O(wh)\)枚举中心计算 C. Permutations 将序列一映射成序列二的位置,找到第一个\(a_i>a_{i+1}\)位置,后面的元素都需要操作一次. D. AlgoRace 最多有60个点,那么任意两点最短距离的边数不超过60条,也就是说最多改变60次即可. E. Weak Memory 二分q,然后跑最短路,若当前点有志愿者,则距离更新为0. 那么每条边最…

Cut Ribbon time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Polycarpus has a ribbon, its length is n. He wants to cut the ribbon in a way that fulfils the following two conditions: After the…

A. Cut Ribbon time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Polycarpus has a ribbon, its length is n. He wants to cut the ribbon in a way that fulfils the following two conditions: After…

Codeforces Round #456 (Div. 2) A. Tricky Alchemy 题目描述:要制作三种球:黄.绿.蓝,一个黄球需要两个黄色水晶,一个绿球需要一个黄色水晶和一个蓝色水晶,一个蓝球需要三个蓝色水晶,现有\(A\)个黄色水晶和\(B\)个蓝色水晶,要制作\(x\)个黄球,\(y\)个绿球和\(z\)个蓝球,还需要多少个水晶? solution \(max(0, x*2+y-A)+max(0, z*3+y-B)\) 时间复杂度:$ O(1) $ B. New Year's…

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…