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Competition Arena > SubstitutionCode

SubstitutionCode

SRM 257 · 2005-08-08 · by lars2520

SRM 257 · 2005-08-08 · by lars2520 · String Manipulation
Class Name: SubstitutionCode
Return Type: int
Method Name: getValue
Arg Types: (string, string)
Problem Statement

Problem Statement

A simple, easy to remember system for encoding integer amounts can be very useful. For example, dealers at flea markets put the information about an item on a card that they let potential buyers see. They find it advantageous to encode the amount they originally paid for the item on the card.

A good system is to use a substitution code, in which each digit is encoded by a letter. An easy to remember 10-letter word or phrase, the key, is chosen. Every '1' in the value is replaced by the first letter of the key, every '2' is replaced by the second letter of the key, and so on. Every '0' is replaced by the last letter of the key. Letters that do not appear in the key can be inserted anywhere without affecting the value represented by the code.. This helps to make the resulting code much harder to break (without knowing the key).

Create a class SubstitutionCode that contains the method getValue that is given the Strings key and code as input and that returns the decoded value.

Constraints

  • code contains between 1 and 9 characters inclusive, all uppercase letters 'A'-'Z'
  • code contains at least one letter that is found in key
  • key contains exactly 10 uppercase letters 'A'-'Z', all distinct from each other
Examples
0)
"TRADINGFEW"
"LGXWEV"
Returns: 709

The L,X, and V are ignored since they do not appear in the key. G is the seventh letter in the key, W is the 10th letter, and E is the 9th letter.

1)
"ABCDEFGHIJ"
"XJ"
Returns: 0
2)
"CRYSTALBUM"
"MMA"
Returns: 6
3)
"ABCDEFGHIJ"
"BLKVA"
Returns: 21
4)
"KLMNOPQRST"
"P"
Returns: 6

Submissions are judged against all 28 archived test cases, of which 5 are shown here. Case numbers match the judge’s.

Coding Area

Language: C++17 · define a public class SubstitutionCode with a public method int getValue(string key, string code) · 28 test cases · 2 s / 256 MB per case

Submitting as anonymous