Problem 03.The Pianist
Колеги мъча се но нещо не мога да довърша задачата ако може някой да прати решение да си поправя грешки или допълня където има пропуснато.
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Programming Fundamentals Final Exam Retake 15.08.2020
Problem 3. The Pianist
You are a pianist and you like to keep a list of your favorite piano pieces. Create a program, to help you organize it and add, change, remove pieces from it!
On the first line of the standard input you will receive an integer n – the number of pieces that you will initially have. On the next n lines the pieces themselves will follow with their composer and key, separated by "|" in the following format:
{piece}|{composer}|{key}
Then, you will be receiving different commands, each on a new line, separated by "|", until the "Stop" command is given
- Add|{piece}|{composer}|{key}
- You need to add the given piece with the information about it to the other pieces
- If the piece is already in the collection, print:
- {piece} is already in the collection!"
- If the piece is not in the collection, print:
"{piece} by {composer} in {key} added to the collection!"
- If the piece is not in the collection, print:
- Remove|{piece}
- If the piece is in the collection, remove it and print:
"Successfully removed {piece}!"
- If the piece is not in the collection, print:
"Invalid operation! {piece} does not exist in the collection."
- ChangeKey|{piece}|{new key}
- If the piece is in the collection, change its key with the given one and print:
"Changed the key of {piece} to {new key}!"
- If the piece is not in the collection, print:
"Invalid operation! {piece} does not exist in the collection."
Upon receiving the "Stop" command you need to print all pieces in your collection, sorted by their name and by the name of their composer in alphabetical order, in the following format:
"{Piece} -> Composer: {composer}, Key: {key}"
Input/Constraints
- You will receive a single integer at first – the initial number of pieces in the collection
- For each piece you will receive a single line of text with information about it.
- Then you will receive multiple commands in the way described above, until the command "Stop".
Output
- All the output messages with the appropriate formats are described in the problem description.
Examples
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Input |
Output |
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3 Fur Elise|Beethoven|A Minor Moonlight Sonata|Beethoven|C# Minor Clair de Lune|Debussy|C# Minor Add|Sonata No.2|Chopin|B Minor Add|Hungarian Rhapsody No.2|Liszt|C# Minor Add|Fur Elise|Beethoven|C# Minor Remove|Clair de Lune ChangeKey|Moonlight Sonata|C# Major Stop |
Sonata No.2 by Chopin in B Minor added to the collection! Hungarian Rhapsody No.2 by Liszt in C# Minor added to the collection! Fur Elise is already in the collection! Successfully removed Clair de Lune! Changed the key of Moonlight Sonata to C# Major! Fur Elise -> Composer: Beethoven, Key: A Minor Hungarian Rhapsody No.2 -> Composer: Liszt, Key: C# Minor Moonlight Sonata -> Composer: Beethoven, Key: C# Major Sonata No.2 -> Composer: Chopin, Key: B Minor |
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Comments |
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After we receive the initial pieces with their info, we start receiving commands. The first two commands are to add a piece to the collection and since the pieces are not already added, we manage to add them. The third add command, however, attempts to add a piece, which is already in the collection, so we print a special message and don't add the piece. After that we receive the remove command and since the piece is in the collection, we remove it successfully. |
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Input |
Output |
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4 Eine kleine Nachtmusik|Mozart|G Major La Campanella|Liszt|G# Minor The Marriage of Figaro|Mozart|G Major Hungarian Dance No.5|Brahms|G Minor Add|Spring|Vivaldi|E Major Remove|The Marriage of Figaro Remove|Turkish March ChangeKey|Spring|C Major Add|Nocturne|Chopin|C# Minor Stop |
Spring by Vivaldi in E Major added to the collection! Successfully removed The Marriage of Figaro! Invalid operation! Turkish March does not exist in the collection. Changed the key of Spring to C Major! Nocturne by Chopin in C# Minor added to the collection! Eine kleine Nachtmusik -> Composer: Mozart, Key: G Major Hungarian Dance No.5 -> Composer: Brahms, Key: G Minor La Campanella -> Composer: Liszt, Key: G# Minor Nocturne -> Composer: Chopin, Key: C# Minor Spring -> Composer: Vivaldi, Key: C Major |