Statistics

Problem Statement for "DoubleLetterCount"

Problem Statement

You are given String s, consisting of all upper-case letters. A double-letter refers to two adjacent letters in the string being the same. Return the number of double-letters appearing in s.

Definition

Class:
DoubleLetterCount
Method:
count
Parameters:
String
Returns:
int
Method signature:
int count(String s)
(be sure your method is public)

Constraints

  • s will contain between 1 and 50 characters, inclusive.
  • Each character in s will be an upper-case ('A'-'Z') letter.
  • s will not contain any triple-letters.

Examples

  1. "MISS"

    Returns: 1

    The SS is a double letter.

  2. "COMMITTEE"

    Returns: 3

    M, T, and E all form double letters.

  3. "AABAAC"

    Returns: 2

    Notice that we count both instances of AA.

  4. "ABCDEFG"

    Returns: 0

    No double letters here.

  5. "AXXBCYWWYDEFZZ"

    Returns: 3

  6. "HWMUGFQLEJXCJRMSZGUZSADXALKVNKBHEHWGSURZNCDPMUZMYJ"

    Returns: 0

  7. "VXRSJLECMAJEDNIXYTYXFSLFTWDRQTKNGNKOGDUIFHTQGIANOH"

    Returns: 0

  8. "TLLKSCLLZNINMSPVYPDUQUZPSXZVZLVQCIZZCVVHDUEHZSVAAL"

    Returns: 5

  9. "JLJTQZLVRUDPLORSKDTQSCUVRWPSQACYVOBKGISANHDAENJQPH"

    Returns: 0

  10. "HRHJSGQOCUJTFRSFUXMHLBLTCKYTREMZCISKRLWUTSGXQTCMIY"

    Returns: 0

  11. "CFMAKJLMUDLRLYZVLEMHPVKNCLEMEQWMYVFCALHBPIAJZMRFOR"

    Returns: 0

  12. "LRVIRHUYXZEYHDGZTQSWVAWLRGUBOPUZXNFERPDYIBNIXRAXCA"

    Returns: 0

  13. "MIM"

    Returns: 0

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