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Problem Statement for "DoubleString"

Problem Statement

A string is called a square if it can be created by concatenating two copies of the same string. For example, "CANCAN" is a square because it consists of two copies of the string "CAN". Other squares include "AA", "ZZZZ", and "BERIBERI". The strings "AAAAA" and "HAHAHA" are not squares.

You are given a String S. Return "square" (quotes for clarity) if there is a string T such that S = T + T. Otherwise, return "not square". Note that the return value is case-sensitive.

Definition

Class:
DoubleString
Method:
check
Parameters:
String
Returns:
String
Method signature:
String check(String S)
(be sure your method is public)

Constraints

  • The length of S will be between 1 and 50, inclusive.
  • Each character in S will be an uppercase letter ('A'-'Z').

Examples

  1. "MAZAIMAZAI"

    Returns: "square"

    If T is "MAZAI", T+T will be "MAZAIMAZAI".

  2. "MAMAZAIZAI"

    Returns: "not square"

    In this case, there is no string T for which T+T will be S.

  3. "IOI"

    Returns: "not square"

    The length of S is odd, so it's impossible to make S by concatenating the same string twice.

  4. "AA"

    Returns: "square"

    T will be "A".

  5. "ABCCBA"

    Returns: "not square"

  6. "Y"

    Returns: "not square"

  7. "RFKQYUQFRFKQYUQF"

    Returns: "square"

  8. "KXYQVNRTYFKXYQVNRTYS"

    Returns: "not square"

  9. "RMZLYGFVEURMZLYGFVEU"

    Returns: "square"

  10. "QFPDBHLQDQERCRWDNXQFPDBHLQDQRRCRWDNX"

    Returns: "not square"

  11. "QQEKLAITGDPHCSPIJTHQQEKLAITGDPHCSPIJTH"

    Returns: "square"

  12. "SLYFVLADZPBFUDKKSFYFVLADZPBFUDKK"

    Returns: "not square"

  13. "QAOZMIXRQAOZMIXR"

    Returns: "square"

  14. "IFEFFECLHBVFUKBYEWFQOJIFEFFECLHBVFUKBYEQFQOJ"

    Returns: "not square"

  15. "OSILEEOSILEE"

    Returns: "square"

  16. "TXWJLKNGBQQMTXQCQPTXWJLKNGBQQMBXQCQP"

    Returns: "not square"

  17. "HQRQDWFCAYSSYOQCJOMWUFBDHQRQDWFCAYSSYOQCJOMWUFBD"

    Returns: "square"

  18. "XUZZHIFTAKCXUDZHIFTAKC"

    Returns: "not square"

  19. "SS"

    Returns: "square"

  20. "HLOETSWCRFHPXPRBSSBLOETSWCRFHPXPRBSS"

    Returns: "not square"

  21. "XDFXDF"

    Returns: "square"

  22. "LEBXWBCROAYAXZFBJBKLEBXWBCTOAYAXZFBJBK"

    Returns: "not square"

  23. "RIMQPZWRIMQPZW"

    Returns: "square"

  24. "SHLPWHTAZHBUXHSHLPJHTAZHBUXH"

    Returns: "not square"

  25. "LPTOYEZIWKMGSLPTOYEZIWKMGS"

    Returns: "square"

  26. "VQZGIVQZGD"

    Returns: "not square"

  27. "AAAAAAAAAA"

    Returns: "square"

  28. "RFKQYUQF"

    Returns: "not square"

  29. "KXYQVNRTYS"

    Returns: "not square"

  30. "RZRM"

    Returns: "not square"

  31. "LYGFVEULQFPDBHLQDQRRCRWDNXEUOQQEKL"

    Returns: "not square"

  32. "ITGDPHCSPIJTHBSFYFVLADZ"

    Returns: "not square"

  33. "BFUDKKLRWQAOZMIXRP"

    Returns: "not square"

  34. "FEFFECLHBVFUKBYEQFQOJWTWOSILE"

    Returns: "not square"

  35. "ZTX"

    Returns: "not square"

  36. "JLKNGBQQMBXQC"

    Returns: "not square"

  37. "PTKHHQRQDWFCAYSSYOQCJOMWUFBDFXUDZHIFTAKCZVHSYBLOE"

    Returns: "not square"

  38. "JSJ"

    Returns: "not square"

  39. "BBHHH"

    Returns: "not square"

  40. "AAAAA"

    Returns: "not square"

  41. "AB"

    Returns: "not square"

  42. "ABCABC"

    Returns: "square"

  43. "AAA"

    Returns: "not square"

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