Statistics

Problem Statement for "DiamondHunt"

Problem Statement

You are a diamond hunter looking for diamonds in a peculiar mine. This mine is a String of '<' and '>' characters, and each diamond is a substring of the form "<>". Each time you find a diamond, you remove it and the residual mine is updated by removing the 2 characters from the String.

For example, if you have a mine like "><<><>>><", you can start by removing the first appearance of "<>" to get "><<>>><", then remove the only remaining diamond to get "><>><". Note that this produces a new diamond which you can remove to get ">><". Since there are no diamonds left, your expedition is done.

Given a String mine, return the number of diamonds that can be found. Note that the order in which you remove simultaneous appearances of diamonds is irrelevant; any order will lead to the same result.

Definition

Class:
DiamondHunt
Method:
countDiamonds
Parameters:
String
Returns:
int
Method signature:
int countDiamonds(String mine)
(be sure your method is public)

Constraints

  • mine will contain between 1 and 50 characters, inclusive.
  • Each character of mine will be either '<' or '>'.

Examples

  1. "><<><>>><"

    Returns: 3

    The example from the problem statement.

  2. ">>>><<"

    Returns: 0

    No diamonds here.

  3. "<<<<<<<<<>>>>>>>>>"

    Returns: 9

  4. "><<><><<>>>><<>><<><<>><<<>>>>>><<<"

    Returns: 14

  5. "<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>"

    Returns: 25

  6. "><<><<><><<<<<>><<><><><>>><<>>><<><><<><><>>><<<<"

    Returns: 21

  7. ">><><><>>><><><<<><><<<>><<>><>>>><><>"

    Returns: 17

  8. "><>>>><<<><>>><<<"

    Returns: 5

  9. "<<<<<<><<>><><>>><>><>>><<>>><<>><><<><>>>>>>>>><"

    Returns: 20

  10. "><<><>>><>><<><<><<>><><<>>>><><>><>>>>>>"

    Returns: 16

  11. "><<<<<><<<<><<<<><><>>><<><<<>><>><"

    Returns: 12

  12. "<<<<<<<<<<>><><<<>><<>><><>>><<><<>>>>>><>>><<<>>>"

    Returns: 24

  13. ">>><<>>><><><><"

    Returns: 5

  14. "<><>><><><>><><><><><>>"

    Returns: 10

  15. "<><>>><>>><>><><<>><>><<>>><<<<<>><><<><><<<><><<"

    Returns: 17

  16. "<<<><><"

    Returns: 2

  17. "<>>><><<<<<<<>><><<>"

    Returns: 6

  18. "<<<>>>>>><<<<>><<<>><<<<><><><><>>><<><>><<>>>>><<"

    Returns: 22

  19. "<<<<<>><><><<<>>>><<<<><><><<>>><<>><<>><>>><><>>>"

    Returns: 25

  20. "<<<<<><><>><><<><><<<>>>>><>>>"

    Returns: 15

  21. "<><><>"

    Returns: 3

  22. "<<<<<<><><><><>>><><<>><<<<<><>>><<>>><<<><>>>>>>>"

    Returns: 25

  23. "<<<><><<<><>><><>>><>>"

    Returns: 11

  24. "<<<<<>>><<<<<>>>>><>>>"

    Returns: 11

  25. "<><><<<<><<><>>>>><><<<>>><><><<<<<><><>><<>><>>>>"

    Returns: 25

  26. "<<<<><>>>>"

    Returns: 5

  27. "<<><><<><>>>"

    Returns: 6

  28. "<<<<<>><><><><><>><><><<<><><><<>>>><><<><<>><>>>>"

    Returns: 25

  29. "<><<>>"

    Returns: 3

  30. "<<<>>><<<<<><><><>>>><><><>><<>><><><<<<<><>>>>>"

    Returns: 24

  31. "<<<<<<<<<<>><>>>>>><<><>><><<>><>><><><><<><><>>>>"

    Returns: 25

  32. "<"

    Returns: 0

  33. ">"

    Returns: 0

  34. "><"

    Returns: 0

  35. "<<"

    Returns: 0

  36. ">>"

    Returns: 0

  37. "<>"

    Returns: 1

  38. ">>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<"

    Returns: 0

  39. ">>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<"

    Returns: 0

  40. ">>>>>>>>>>>>><<<<<<"

    Returns: 0

  41. ">>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"

    Returns: 0

  42. ">>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"

    Returns: 0

  43. "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>"

    Returns: 4

  44. "<<<>>>>>>>>>>>>>>>>>"

    Returns: 3

  45. "<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>"

    Returns: 15

  46. "<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>"

    Returns: 20

  47. "<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>"

    Returns: 8

  48. "<<<<<<<<<><><>>>>>>>><<<>>>><<<<<<<>>><<>><<>>>>>>"

    Returns: 25

  49. "<<<<<<<<<<>><<>>>>>>><<>>>>>"

    Returns: 14

  50. "<<<<<<<<<>>>>>>><<>>>><><<<><>>><><<<>>>"

    Returns: 20

  51. "<><<<<<<<<<>><>><<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>><>"

    Returns: 25

  52. "<<<<<><<><>><<<>>>><><<<<><><>>>>>>>"

    Returns: 18

  53. "<><<<><><>><<<>>>>"

    Returns: 9

  54. "<<<<<<>>><><>>>><<><<<<<<<<><><<<<>>>>>>>>>><<>>>>"

    Returns: 25

  55. "<><><><><><><><><><><><><><><><<><>><><><><<>><><>"

    Returns: 25

  56. "<<><><><>><><><><<>>"

    Returns: 10

  57. "<><><><><<>><>"

    Returns: 7

  58. "<<><><<>><<><<<>>>><<>><><<<>>><>><<>><<>><><><><>"

    Returns: 25

  59. "<<><><><>><>"

    Returns: 6

  60. "<<><><><><><><><>><<>><><><>"

    Returns: 14

  61. "<><><><><><<><><<>><><><><><<>><><<><><>><><><><>>"

    Returns: 25

  62. "<><><><><><><><><><><><><><><><><><><><><><><><><>"

    Returns: 25

  63. "<><><><><><><><><><><><><><><><><><>"

    Returns: 18

  64. "<><><><><><><><><><><><><><><><><><><><><><><>"

    Returns: 23

  65. "<<<<>>>>"

    Returns: 4

  66. "<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>"

    Returns: 23

  67. ">><<"

    Returns: 0

  68. "<<>"

    Returns: 1

  69. "<<>>"

    Returns: 2

  70. "<<<<>>>"

    Returns: 3

  71. "<>>"

    Returns: 1

  72. "<<>><<>>"

    Returns: 4

  73. "<>>>>>>"

    Returns: 1

  74. ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"

    Returns: 0

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