zoukankan      html  css  js  c++  java
  • Live Archive 3490

    https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&category=214&page=show_problem&problem=1491

    We can generate a random string by generating a sequence of random characters and concatenating them together. Each character is chosen independently from the first n <tex2html_verbatim_mark>letters in the English alphabet with equal probability. Only capital letters are used in this problem. The generation is stopped as soon as a specific pattern occurs in the random string.

    Your task is to predict the expected length of the generated string.

    Input 

    Standard input will contain multiple test cases. The first line of the input is a single integer T <tex2html_verbatim_mark>(1$ le$T$ le$10)<tex2html_verbatim_mark>which is the number of test cases. T <tex2html_verbatim_mark>test cases follow, each preceded by a single blank line.

    Each test case consists of a single integer N <tex2html_verbatim_mark>(1$ le$N$ le$26) <tex2html_verbatim_mark>which is the number of letters used, and a pattern, which is a non-empty string consisting of letters chosen from the first N <tex2html_verbatim_mark>upper case English letters. The length of any pattern will not exceed 12.

    Output 

    Results should be directed to standard output. Start each case with ``Case # <tex2html_verbatim_mark>:" on a single line, where # <tex2html_verbatim_mark>is the case number starting from 1. Two consecutive cases should be separated by a single blank line. No blank line should be produced after the last test case.

    For each test case, print the expected length of the generated random string.

    Sample Input 

    5
    
    2 A
    
    2 ABA
    
    3 AAAAA
    
    26 ACMICPC
    
    26 ZJUZJU
    

    Sample Output 

    Case 1:
    2
    
    Case 2:
    10
    
    Case 3:
    363
    
    Case 4:
    8031810176
    
    Case 5:
    308933352


  • 相关阅读:
    正则表达式
    对象与私有成员变量恩仇录
    c语言,中缀表达式转后缀表达式并计算
    Graphics Class
    获取当前应用程序所在目录的路径
    centos安装vim
    Linux更改IP地址
    Linux常用命令
    Linux添加环境变量
    Linux虚拟机安装
  • 原文地址:https://www.cnblogs.com/tobec/p/p0002.html
Copyright © 2011-2022 走看看