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Problem Statement for "LuckyTicketSubstring"

Problem Statement

A lucky ticket is an integer with exactly 2*n digits (written without leading zeroes), where the sum of the leftmost n digits is equal to the sum of the rightmost n digits.

You are given a String s, which contains only non-zero digits. Find the longest contiguous substring of s that is a lucky ticket and return its length. If there is no such lucky ticket, return 0 instead.

Definition

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

Constraints

  • s will contain between 1 and 50 characters, inclusive.
  • s will contain non-zero digits ('1'-'9') only.

Examples

  1. "123231"

    Returns: 6

    The entire string, 123231, is a lucky ticket because the first 3 digits sum up to 1+2+3=6, and the last 3 digits sum up to 2+3+1=6.

  2. "74233285"

    Returns: 4

    4233 is the longest lucky ticket here.

  3. "986561517416921217551395112859219257312"

    Returns: 36

  4. "12345678986987654321123456789359876543211234567895"

    Returns: 32

  5. "1"

    Returns: 0

  6. "333"

    Returns: 2

  7. "23"

    Returns: 0

  8. "112"

    Returns: 2

    A lucky ticket must contain an even number of digits.

  9. "33112321321321313213123213213213231323123211232121"

    Returns: 50

  10. "11178537359954626351226312697414325288127964296"

    Returns: 44

  11. "5835379471913726788872553377866967438276853224256"

    Returns: 46

  12. "93189284642331479989688422615272657491328525264915"

    Returns: 36

  13. "84768681396688156516686398798382834931358195759"

    Returns: 44

  14. "6631398633671535148112635632232895245265459176278"

    Returns: 40

  15. "38194879498391342622196735661826539989497482524"

    Returns: 30

  16. "98955592368299428515452817997113992371773713336"

    Returns: 44

  17. "22912258674523548849358515592493787865592955712"

    Returns: 32

  18. "69732648345152728943246953871181848886594696676"

    Returns: 30

  19. "67722275835625314863189374573389883452488454396"

    Returns: 28

  20. "59122739423292665836621349372635191955555471468292"

    Returns: 40

  21. "1178537359954626351226312697414325288127964296"

    Returns: 44

  22. "6656685678688985689959856697679877686588675598"

    Returns: 40

  23. "6977666776697868866976696998777668767676696999"

    Returns: 40

  24. "94598476598796698545657998999579568859796498576"

    Returns: 32

  25. "89799979989999778987787789989988988988788987897798"

    Returns: 46

  26. "99899988888998989989998998999888988889898998989"

    Returns: 38

  27. "788897877999887998997979899977989899898978797997"

    Returns: 44

  28. "55566757677657677656677567755557666665657756775667"

    Returns: 36

  29. "35333535345344434445533455553354435445443445455345"

    Returns: 44

  30. "57567755577677665667566567655757666666757567655767"

    Returns: 48

  31. "66665545654665666546565556466465546545646664665666"

    Returns: 42

  32. "23432232234434433433433233432342243234432423242434"

    Returns: 50

  33. "3"

    Returns: 0

  34. "11"

    Returns: 2

  35. "112"

    Returns: 2

  36. "2313"

    Returns: 0

  37. "23341"

    Returns: 2

  38. "323321"

    Returns: 4

  39. "2233123"

    Returns: 2

  40. "31111322"

    Returns: 6

  41. "986561517416921217551395112759219257312"

    Returns: 36

  42. "7"

    Returns: 0

  43. "111111"

    Returns: 6

  44. "555"

    Returns: 2

  45. "12356467567634998"

    Returns: 12

  46. "12361"

    Returns: 0

  47. "123"

    Returns: 0

  48. "123213"

    Returns: 6

  49. "2111111112"

    Returns: 10

  50. "1654646"

    Returns: 4

  51. "3216542158963258745695896321458789632589632589652"

    Returns: 48

  52. "112999"

    Returns: 2

  53. "7647631234115362517357"

    Returns: 8

  54. "212"

    Returns: 0

  55. "9865615174169212171212121212"

    Returns: 8

  56. "744233456256812536"

    Returns: 18

  57. "8764376876373464215621738991"

    Returns: 18

  58. "99999999999999999999999999999999999999999999999999"

    Returns: 50

  59. "4563456567356"

    Returns: 6

  60. "12334566546456345345345645"

    Returns: 16

  61. "123321"

    Returns: 6

  62. "91111"

    Returns: 4

  63. "651"

    Returns: 0

  64. "15141"

    Returns: 0

  65. "712312346"

    Returns: 6

  66. "1111331223"

    Returns: 8

  67. "44"

    Returns: 2

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