Задача 5. C# Messages от More Exercise Introduction

Здравейте, може ли малко помощ на тази задача :

1.Messages

Write a program, which emulates typing an SMS, following this guide:

abc

def

ghi

jkl

mno

pqrs

tuv

wxyz

space

Following the guide, 2 becomes “a”, 22 becomes “b” and so on.

Examples

Input

Output

Input

Output

Input

Output

555

666

hello

999

777

hey there

meet me

Hints

A native approach would be to just put all the possible combinations of digits in a giant switch statement.
A cleverer approach would be to come up with a mathematical formula, which converts a number to its alphabet representation:

Digit	2	3	4	5	6	7	8	9
Index	0 1 2	3 4 5	6 7 8	9 11 12	13 14 15	16 17 18 19	20 21 22	23 24 25 26
Letter	a b c	d e f	g h i	j k l	m n o	p q r s	t u v	w x y z

Let’s take the number 222 (c) for example. Our algorithm would look like this:
- Find the number of digits the number has “e.g. 222 è 3 digits”
- Find the main digit of the number “e.g. 222 è 2”
- Find the offset of the number. To do that, you can use the formula: (main digit - 2) * 3
- If the main digit is 8 or 9, we need to add 1 to the offset, since the digits 7 and 9 have 4 letters each
- Finally, find the letter index (a è 0, c è 2, etc.). To do that, we can use the following formula: (offset + digit length - 1).
- After we’ve found the letter index, we can just add that to the ASCII code of the lowercase letter “a” (97)

И трите нулеви тестове минават, но след това се чупи някъде. Моля някой за малко съвет?

Направил съм я по стандартния начин с Switch case конструкция, като входните данни от конзолата първо се четяха като целочислени тип Integer, сега ги направих да са String, но отново същия резултат в Judge 20/100 точки.

Ето и кода: https://pastebin.com/tQtUbLey - Вариант със string

https://pastebin.com/jd1gR5nG - Вариант с Integer

static char LineToSymbol(string line) { // validate if (line.Length <= 0 || line.Length > 4) throw new ArgumentException ("Unexpected line length"); if (line[0] < '0' || line[0] > '9') throw new ArgumentException ("Unexpected button"); for (int i = 1; i < line.Length; i++) if (line[i - 1] != line[i]) throw new ArgumentException ("Unexpected line content"); int[] btns = { 1, 0, 3, 3, 3, 3, 3, 4, 3, 4 }; // btn_size [symbols] if (btns[line[0] - '0'] < line.Length) throw new ArgumentException ("Unexpected button content"); // compute int[] btn = { 0, 0, 1, 4, 7, 10, 13, 16, 20, 23 }; // offset of each button into "symbols" const string symbols = " abcdefghijklmnopqrstuvwxyz"; return symbols[btn[line[0] - '0'] + (line.Length - 1)]; } static void Main() { int lines_count; if (!int.TryParse (Console.ReadLine (), out lines_count)) throw new Exception ("Not a number"); if (lines_count <= 0 || lines_count >= 1 << 8) throw new Exception ("Odd number of buttons"); StringBuilder message = new StringBuilder (); while (lines_count-- > 0) message.Append (LineToSymbol (Console.ReadLine ())); Console.WriteLine (message.ToString ()); Console.ReadLine (); }