Programming contests

ECN selejtező programozó csapatverseny, 2014. április 27.

April 27, 2014 10:30 AM – April 27, 2014 3:30 PM

Word Index

Encoding schemes are often used in situations requiring encryption or information storage/transmission economy. Here, we develop a simple encoding scheme that encodes particular types of words with five or fewer (lowercase) letters as integers.

Consider the English alphabet {a, b, c, …, z}. Using this alphabet, a set of valid words are to be formed that are in a strict lexicographic order. In this set of valid words, the successive letters of a word are in a strictly ascending order; that is, later letters in a valid word are always after previous letters with respect to their positions in the alphabet list {a, b, c, …, z}. For example,

abc aep gwz

are all valid three-letter words, whereas

aab are cat

are not.

For each valid word, associate an integer which gives the position of the word in the alphabetized list of words. That is:

a -> 1
b -> 2

z -> 26
ab -> 27
ac -> 28

az -> 51
bc -> 52

vwxyz -> 83681

Your program is to read a series of input lines. Each input line will have a single word on it, that will be from one to five letters long. For each word read, if the word is invalid, give the number 0. If the word read is valid, give the word's position index in the above alphabetical list.

Input Specification

The input consists of a series of single words, one per line. The words are at least one letter long and no more than five letters. Only the lowercase alphabetic {a, b, c, …, z} characters will be used as input. The first letter of a word will appear as the first character on an input line.

The input will be terminated by end-of-file.

Output Specification

The output is a single integer, greater than or equal to zero (0) and less than or equal to 83681. The first digit of an output value should be the first character on a line. There is one line of output for each input line.

Sample Input

  1. z
  2. a
  3. cat
  4. vwxyz
download as text file

Output for Sample Input

  1. 26
  2. 1
  3. 0
  4. 83681
download as text file
University of Debrecen; Faculty of Informatics; v. 03/01/2019