Statistics

Problem Statement for "BootsExchange"

Problem Statement

A boot shop has received a shipment from the factory consisting of N left boots and N right boots. Each boot has some integer size, and a left and right boot will form a proper pair if they have equal sizes. Each boot can only belong to a single pair. The employees of the boot store want to create N proper pairs of boots. Fortunately, the factory has offered to exchange any number of boots in the shipment with new boots of different sizes.

You are given a int[] left and a int[] right containing the sizes of the left boots and right boots, respectively. Return the least number of boots that must be exchanged.

Definition

Class:
BootsExchange
Method:
leastAmount
Parameters:
int[], int[]
Returns:
int
Method signature:
int leastAmount(int[] left, int[] right)
(be sure your method is public)

Constraints

  • Each element in left will be between 1 and 1000, inclusive.
  • Each element in right will be between 1 and 1000, inclusive.
  • left and right will have the same number of elements.
  • left will contain between 1 and 50 elements, inclusive.

Examples

  1. {1, 3, 1}

    {2, 1, 3}

    Returns: 1

    They can exchange a size 1 left shoe for a size 2 left shoe, or they can exchange the size 2 right shoe for a size 1 right shoe.

  2. {1, 3}

    {2, 2}

    Returns: 2

    They can exchange both left shoes for size 2 left shoes, or they can exchange the right shoes for a size 1 right shoe and a size 3 right shoe, or they can mix these two possibilities.

  3. {1, 2, 3, 4, 5, 6, 7}

    {2, 4, 6, 1, 3, 7, 5}

    Returns: 0

    Nothing to exchange.

  4. {3, 1, 4, 7, 3, 1, 4, 5, 1}

    {2, 5, 2, 3, 4, 1, 4, 6, 8}

    Returns: 4

  5. {5, 2, 1, 4, 7, 9, 1, 1, 3, 4}

    {2, 5, 1, 3, 4, 6, 3, 2, 2, 5}

    Returns: 5

  6. {1}

    {1}

    Returns: 0

  7. {2,2}

    {2,2}

    Returns: 0

  8. {3,3,3}

    {2,2,1}

    Returns: 3

  9. {2,3,4,4}

    {2,2,4,2}

    Returns: 2

  10. {4,5,3,4,3}

    {1,2,4,3,5}

    Returns: 2

  11. {3,3,4,6,3,4}

    {1,6,4,5,3,5}

    Returns: 3

  12. {7,1,2,4,4,2,4}

    {2,2,2,6,6,6,2}

    Returns: 5

  13. {2,7,2,6,6,4,4,5}

    {7,2,6,6,5,2,4,8}

    Returns: 1

  14. {8,4,5,4,1,9,2,5,6}

    {2,9,9,1,4,5,3,8,7}

    Returns: 3

  15. {83,123,117,112,16,102,97,42,107,27,113,54,62,122,66,103,51,74,70,56,16,23,121,118,75,39,70,87,13,87,31,81,118,4,18,84,2,76,84,52,37}

    {57,51,116,41,42,3,46,42,19,113,91,94,47,106,23,43,10,103,53,51,29,14,50,35,38,92,51,23,104,117,85,40,88,28,8,15,114,62,96,87,40}

    Returns: 33

  16. {61,73,52,65,45,113,61,29,73,2,73,2,6,40,82,32,34,7,74,2,59,8,52,89,35,13,117,19,60,26,105,63,123,9,36,4,45,23,51,123,69,90}

    {43,15,57,76,16,19,16,104,53,119,47,63,27,43,57,45,36,76,36,69,78,47,40,65,21,101,83,59,39,2,53,56,121,104,114,67,9,97,44,41,55,55}

    Returns: 32

  17. {56,12,72,105,97,122,2,81,14,54,96,61,14,129,115,19,106,60,25,107,93,119,120,15,80,6,62,122,65,52,5,77,29,75,11,49,83,73,128,55,68,97,27}

    {40,59,15,102,76,115,24,13,48,60,29,81,17,61,27,110,2,10,95,28,33,36,97,91,91,93,56,56,127,59,56,54,30,81,34,61,59,59,61,38,33,73,122}

    Returns: 29

  18. {17,27,41,9,120,63,128,84,25,61,122,12,82,35,83,9,66,10,105,97,86,12,48,58,68,41,110,77,51,125,42,122,113,73,63,34,48,131,69,94,22,47,103,41}

    {60,36,28,2,74,65,11,35,122,10,107,74,8,31,117,114,93,7,46,82,55,53,88,26,120,112,19,3,48,82,5,110,62,92,99,5,32,28,28,30,50,20,109,57}

    Returns: 37

  19. {125,79,3,24,28,17,48,38,4,109,24,66,49,77,11,92,71,1,77,4,73,33,42,70,85,25,130,5,133,30,32,26,23,86,34,131,16,45,99,129,63,15,99,94,116}

    {14,126,135,60,114,8,97,59,79,96,28,54,95,129,106,130,91,78,7,4,118,62,79,55,77,125,85,115,30,12,89,91,88,94,9,16,87,126,130,131,11,127,88,43,57}

    Returns: 32

  20. {25,75,102,42,83,75,3,128,49,134,93,133,8,62,15,105,83,16,86,47,84,70,111,73,103,99,13,135,44,11,137,129,128,62,138,100,107,136,137,111,3,21,46,45,103,90}

    {109,19,25,49,118,51,80,105,59,41,126,61,102,131,73,105,22,88,57,135,35,112,83,35,109,93,74,34,27,13,21,116,124,119,46,138,74,93,101,1,138,78,52,124,118,11}

    Returns: 33

  21. {40,54,51,22,132,35,62,56,117,41,45,131,91,107,51,55,80,31,38,86,115,101,3,50,141,108,35,125,18,78,37,140,40,139,113,46,52,11,95,14,22,53,50,104,74,71,48}

    {120,73,77,54,131,45,121,47,124,130,15,7,91,65,57,123,74,137,128,19,44,93,1,139,66,57,16,40,118,141,124,67,138,95,40,66,86,3,77,44,42,10,99,137,116,44,61}

    Returns: 35

  22. {88,117,131,141,30,97,135,77,46,10,113,104,131,72,5,20,15,78,1,96,96,96,50,65,43,143,134,70,53,99,141,25,17,4,57,69,67,36,52,15,51,92,16,66,14,18,25,91}

    {6,132,135,13,121,84,112,18,143,31,138,80,141,123,14,51,22,109,56,44,49,69,27,6,134,103,113,144,50,22,32,28,91,94,120,132,125,62,121,67,98,129,98,119,16,56,116,97}

    Returns: 34

  23. {95,36,69,6,112,27,11,54,65,90,5,132,26,9,101,48,120,139,79,24,3,99,109,129,98,132,53,143,40,74,115,40,127,88,120,117,50,109,71,67,53,95,63,70,101,74,35,87,124}

    {32,40,91,96,19,65,3,11,113,122,58,83,71,87,85,43,2,55,146,101,90,41,28,125,92,58,75,80,14,82,111,93,78,133,77,33,1,127,134,24,120,116,23,25,82,64,66,135,117}

    Returns: 37

  24. {1000}

    {1000}

    Returns: 0

  25. {999,983,981,987,987,995,985,998,981,998,995}

    {981,987,998,981,995,999,987,985,998,995,983}

    Returns: 0

  26. {988,961,997,977,977,995,977,997,998,999,990,971,971,982,986,974,967,983,973,1000,995}

    {982,997,961,971,983,973,967,997,977,982,986,974,999,977,995,995,971,988,998,1000,990}

    Returns: 1

  27. {974,945,967,988,979,964,976,968,986,987,952,973,997,939,951,975,953,960,958,964,982,966,962,950,959,967,967,948,947,954,983}

    {974,964,958,982,967,976,939,954,948,952,947,959,975,966,988,950,953,947,951,975,979,967,945,967,964,973,983,962,960,968,997}

    Returns: 2

  28. {946,982,987,986,908,936,970,906,945,934,938,973,986,997,945,965,934,996,977,960,954,905,948,941,995,921,960,983,981,990,944,940,939,991,905,926,939,925,985,951,960,922,998,968,917,989,976,991,914,938}

    {989,990,991,960,995,997,960,996,991,965,977,917,914,954,951,981,921,938,945,934,968,941,906,970,960,986,983,944,934,939,905,985,945,938,926,982,960,908,998,905,936,991,948,940,973,946,939,922,986,987}

    Returns: 2

  29. {1}

    {2}

    Returns: 1

  30. {114,191,7,43,98,57,120,69,41,88,173}

    {85,59,15,215,31,146,171,46,210,55,156}

    Returns: 11

  31. {405,397,160,356,200,131,113,187,251,120,160,262,278,32,208,312,323,394,349,247,34}

    {73,82,240,188,126,363,414,86,133,151,62,202,319,26,231,6,415,109,257,373,102}

    Returns: 21

  32. {575,473,550,180,94,315,550,147,475,304,38,238,91,160,355,143,605,603,151,571,613,32,277,592,270,258,229,121,223,223,317}

    {487,363,280,596,80,201,244,418,132,216,543,197,199,393,185,79,9,522,582,88,401,253,474,165,373,339,78,426,619,386,500}

    Returns: 31

  33. {796,36,644,822,990,909,164,534,434,681,792,321,604,872,738,560,884,368,447,912,899,444,714,611,913,251,354,936,405,350,154,941,978,147,394,373,931,695,559,564,435,977,132,519,683,889,530,32,281,847}

    {204,383,825,583,48,573,834,458,312,393,803,246,834,155,921,756,816,445,788,579,907,257,893,958,319,583,155,601,799,809,794,58,85,482,416,91,571,103,76,288,70,397,697,529,612,344,143,109,101,271}

    Returns: 50

  34. {30,17,10,24,29,3,20,1,4,9,15,20,27,29,1,30,20,29,24,6,30,22,3,14,13,7,14,30,19,20}

    {17,1,24,20,10,25,5,8,14,14,26,12,28,4,11,9,2,19,9,28,9,2,11,29,13,3,16,25,29,13}

    Returns: 16

  35. {31,28,22,2,2,4,10,19,18,15,16,13,10,5,13,10,11,18,15,12,8,2,30,8,3,5,20,25,2,6,19}

    {13,11,22,23,12,12,11,23,27,5,18,13,22,2,13,11,8,26,19,28,24,20,27,1,21,14,19,23,14,16,8}

    Returns: 16

  36. {16,15,23,5,26,17,18,23,1,26,28,27,10,29,32,17,4,30,24,18,25,14,21,26,6,7,25,10,3,19,20,27}

    {10,18,2,22,1,6,23,31,30,30,19,18,10,29,29,14,32,26,28,30,24,5,4,18,1,16,14,26,21,4,14,5}

    Returns: 12

  37. {24,2,8,21,30,13,33,16,32,8,8,12,3,4,3,33,33,17,3,3,31,32,25,30,9,2,32,18,31,5,27,11,13}

    {26,24,21,20,17,29,26,32,23,14,1,18,4,13,30,14,22,7,24,18,25,29,8,15,1,26,12,4,7,15,11,4,24}

    Returns: 21

  38. {12,11,31,31,5,17,5,9,22,14,8,12,4,3,12,33,30,34,28,29,23,16,8,3,17,4,34,22,9,3,4,4,13,27}

    {33,24,3,22,11,11,16,22,7,33,12,2,16,8,17,8,27,12,8,29,23,1,26,21,27,33,4,18,21,14,16,17,9,16}

    Returns: 16

  39. {8,11,12,32,18,17,27,1,16,20,14,12,27,29,13,7,31,15,2,12,12,22,11,30,19,9,13,11,22,24,12,8,3,33,3}

    {2,9,11,28,20,31,2,33,29,5,24,9,27,32,22,31,14,33,12,9,26,33,35,27,18,8,5,20,11,30,25,8,28,16,27}

    Returns: 15

  40. {23,12,24,30,36,36,3,36,13,11,7,33,15,20,27,1,7,16,18,29,32,7,33,21,2,14,3,15,7,2,15,12,13,1,5,21}

    {17,23,34,15,22,22,14,3,23,35,20,30,19,29,25,16,35,32,35,24,33,9,1,12,16,29,19,35,20,36,12,2,13,15,20,31}

    Returns: 18

  41. {23,36,25,8,21,2,34,14,29,24,10,3,14,4,30,4,36,29,33,21,24,20,26,20,3,36,10,19,34,27,37,2,22,34,4,25,9}

    {21,15,11,5,28,8,34,13,30,16,35,30,5,17,17,24,23,32,30,18,8,35,7,35,33,28,29,19,23,31,35,10,6,26,16,29,25}

    Returns: 24

  42. {15,36,36,35,4,5,17,3,8,3,32,9,3,38,6,27,22,33,5,4,34,8,30,4,7,18,29,7,10,31,35,12,14,35,9,17,18,3}

    {2,21,38,20,35,38,25,28,24,17,29,11,8,6,20,12,15,33,10,13,7,20,24,9,6,28,15,6,21,23,26,29,5,25,10,2,28,38}

    Returns: 25

  43. {7,29,35,38,32,13,18,32,20,34,7,16,6,22,16,19,33,4,38,3,7,18,2,3,14,9,3,32,38,11,32,2,16,29,35,1,23,1,32}

    {33,14,22,7,11,8,30,22,4,16,9,10,14,2,34,16,33,22,38,3,5,20,20,31,7,35,26,25,21,34,1,18,6,29,38,30,19,15,10}

    Returns: 17

  44. {40,34,4,30,24,37,4,4,40,16,33,17,7,15,39,30,14,3,26,23,4,5,23,11,15,21,25,16,38,7,15,16,17,35,10,28,10,32,13,35}

    {4,37,29,7,9,28,24,36,11,34,26,38,24,15,2,30,8,23,3,32,10,34,14,28,2,22,13,7,8,39,2,22,34,25,6,23,9,2,22,35}

    Returns: 18

  45. {8,40,33,35,31,24,40,32,27,26,31,29,5,12,13,35,10,25,25,32,35,9,21,37,4,21,15,13,41,27,12,38,30,3,20,37,21,25,41,9,40}

    {24,18,21,12,37,12,16,31,27,5,24,38,24,16,10,36,25,23,38,40,38,15,31,16,32,33,15,2,32,23,10,37,13,15,38,26,31,19,29,31,12}

    Returns: 20

  46. {15,25,34,21,13,32,31,1,11,21,10,21,4,24,24,10,22,1,34,34,28,6,37,16,16,2,36,6,4,13,34,19,40,15,7,18,33,33,41,41,29,42}

    {14,33,24,11,29,16,36,29,30,33,2,30,29,41,4,7,9,26,31,26,23,31,5,10,14,28,22,6,2,16,10,23,6,31,39,24,23,12,21,6,8,26}

    Returns: 21

  47. {20,30,17,1,33,33,30,15,41,33,35,26,40,5,9,5,22,34,31,8,24,35,37,32,33,38,15,30,40,42,34,6,28,11,23,35,19,37,33,39,18,5,21}

    {15,37,38,12,16,43,2,33,40,6,9,31,15,12,7,13,38,36,35,18,18,24,4,16,22,31,37,24,24,24,7,12,21,12,30,6,33,1,18,38,35,3,32}

    Returns: 23

  48. {17,32,27,21,33,40,33,40,40,25,17,40,35,28,27,11,33,43,26,24,40,24,19,9,27,4,23,9,29,8,6,15,23,36,28,34,27,5,10,13,5,41,22,11}

    {26,24,21,20,13,18,21,10,18,32,43,28,38,37,7,8,41,34,39,12,42,22,15,23,29,13,10,23,4,11,30,36,28,33,2,34,40,23,37,16,22,33,27,4}

    Returns: 20

  49. {6,3,42,30,31,20,40,30,16,16,7,29,45,31,33,9,41,38,2,44,37,19,1,28,12,18,22,43,10,13,29,44,30,25,25,28,2,19,20,4,3,27,34,6,44}

    {2,13,32,32,31,5,40,3,18,26,16,43,41,35,14,40,11,28,1,20,41,35,39,13,2,5,14,16,20,45,32,10,17,42,24,14,40,27,16,6,37,11,16,36,23}

    Returns: 24

  50. {25,25,8,37,3,11,43,26,13,26,5,38,42,32,7,16,4,31,43,9,1,34,36,9,26,38,15,38,26,24,27,28,38,20,2,13,12,21,26,1,16,3,45,37,39,18}

    {7,39,33,40,14,41,25,31,24,43,43,27,2,36,31,45,24,33,45,13,12,32,9,10,46,21,22,13,8,35,40,31,6,44,22,26,28,29,6,3,34,28,13,28,33,11}

    Returns: 23

  51. {5,20,47,11,43,36,39,18,32,9,37,37,17,47,33,8,41,45,36,5,15,27,8,27,26,34,35,16,29,13,47,33,29,21,16,12,27,29,20,9,4,25,8,46,22,13,28}

    {12,41,10,31,27,41,18,12,11,34,22,21,26,1,20,25,25,25,45,33,17,1,34,17,22,6,29,13,9,13,2,18,2,1,17,10,33,9,21,38,13,29,17,32,33,12,45}

    Returns: 25

  52. {1,28,24,35,38,29,8,36,25,31,14,47,47,42,27,11,28,6,33,36,18,6,10,31,10,1,40,24,33,14,40,42,41,11,16,26,33,42,23,16,31,41,4,34,9,44,46,15}

    {35,9,18,37,34,32,19,48,31,5,12,48,8,44,33,37,16,47,20,42,23,31,19,43,4,36,30,36,30,35,22,23,26,27,17,10,31,28,26,11,21,21,22,32,12,8,1,31}

    Returns: 25

  53. {8,20,49,35,45,2,39,26,13,38,28,35,25,5,12,32,39,20,43,43,27,15,41,9,22,27,19,12,28,14,18,15,33,31,43,28,12,46,4,28,7,4,2,35,21,13,13,35,21}

    {1,25,17,33,3,20,46,9,44,48,18,8,6,33,29,31,9,35,22,49,17,11,22,25,25,39,10,1,25,23,12,21,16,13,43,20,4,5,27,37,29,38,18,22,18,5,31,7,35}

    Returns: 26

  54. {16,32,37,34,4,36,26,19,16,3,42,18,25,38,40,46,4,7,39,27,49,32,2,49,29,27,42,25,37,19,32,6,37,36,1,24,21,30,1,9,25,42,26,47,7,36,37,11,45,48}

    {6,35,23,22,43,21,35,2,49,40,40,13,48,20,6,50,13,27,11,16,12,12,28,39,30,4,11,11,16,49,33,27,7,19,10,18,20,19,25,48,20,14,39,15,17,21,26,4,13,48}

    Returns: 28

  55. {999}

    {1000}

    Returns: 1

  56. {1000}

    {999}

    Returns: 1

  57. {1, 2, 3, 4, 5, 6, 7 }

    {2, 4, 6, 3, 7, 5, 8 }

    Returns: 1

  58. {1, 1, 3 }

    {2, 3, 4 }

    Returns: 2

  59. {1, 1, 2 }

    {1, 2, 3 }

    Returns: 1

  60. {1, 2, 3 }

    {2, 3, 4 }

    Returns: 1

  61. {1, 3, 5 }

    {3, 5, 7 }

    Returns: 1

  62. {1, 1 }

    {1, 2 }

    Returns: 1

  63. {1, 2, 3, 4, 5 }

    {2, 3, 4, 5, 6 }

    Returns: 1

  64. {1, 1, 2, 3 }

    {1, 2, 3, 4 }

    Returns: 1

  65. {1, 2, 3, 4, 5, 6, 7, 8, 9 }

    {1, 2, 2, 2, 2, 2, 2, 2, 2 }

    Returns: 7

  66. {1, 3, 1, 4 }

    {2, 1, 1, 1 }

    Returns: 2

  67. {1, 1, 2, 2, 3, 3 }

    {1, 2, 3, 4, 5, 6 }

    Returns: 3

  68. {1, 3 }

    {3, 5 }

    Returns: 1

  69. {3, 1, 2 }

    {1, 1, 3 }

    Returns: 1

  70. {1, 2, 3, 4 }

    {1, 1, 1, 1 }

    Returns: 3

  71. {1, 1, 2, 3 }

    {1, 1, 3, 4 }

    Returns: 1

  72. {1, 2 }

    {1, 1 }

    Returns: 1

  73. {1, 1, 1, 1, 1, 2 }

    {1, 2, 3, 4, 5, 9 }

    Returns: 4

  74. {2, 3, 3, 4, 5 }

    {1, 3, 4, 5, 7 }

    Returns: 2

  75. {1, 2 }

    {2, 3 }

    Returns: 1

  76. {1, 1, 1, 1 }

    {1, 1, 1, 1 }

    Returns: 0

  77. {1, 2, 2, 3, 4 }

    {1, 2, 3, 4, 4 }

    Returns: 1

  78. {1, 1, 2 }

    {2, 2, 3 }

    Returns: 2

  79. {2, 2, 4, 5 }

    {1, 2, 3, 4 }

    Returns: 2

  80. {3, 3, 3 }

    {1, 2, 1 }

    Returns: 3

  81. {1, 1, 1, 3, 4 }

    {1, 1, 2, 2, 3 }

    Returns: 2

  82. {2, 1000, 12, 111, 222, 200 }

    {12, 121, 111, 200, 211, 222 }

    Returns: 2

  83. {999, 232 }

    {231, 999 }

    Returns: 1

  84. {1, 1, 4, 2, 2 }

    {1, 3, 2, 4, 2 }

    Returns: 1

  85. {999, 300, 999 }

    {200, 999, 300 }

    Returns: 1

  86. {1, 2, 3 }

    {1, 2, 1 }

    Returns: 1

  87. {1, 1, 1, 1, 1 }

    {5, 5, 5, 5, 5 }

    Returns: 5

  88. {1, 3 }

    {2, 2 }

    Returns: 2

  89. {1, 2, 2, 2 }

    {2, 2, 2, 1 }

    Returns: 0

  90. {1, 2, 3, 4, 5, 6, 7 }

    {2, 4, 6, 3, 7, 5, 8 }

    Returns: 1

  91. {1, 1, 3 }

    {2, 3, 4 }

    Returns: 2

  92. {1, 1, 2 }

    {1, 2, 3 }

    Returns: 1

  93. {1, 2, 3 }

    {2, 3, 4 }

    Returns: 1

  94. {1, 3, 5 }

    {3, 5, 7 }

    Returns: 1

  95. {1, 1 }

    {1, 2 }

    Returns: 1

  96. {1, 2, 3, 4, 5 }

    {2, 3, 4, 5, 6 }

    Returns: 1

  97. {1, 1, 2, 3 }

    {1, 2, 3, 4 }

    Returns: 1

  98. {1, 2, 3, 4, 5, 6, 7, 8, 9 }

    {1, 2, 2, 2, 2, 2, 2, 2, 2 }

    Returns: 7

  99. {1, 3, 1, 4 }

    {2, 1, 1, 1 }

    Returns: 2

  100. {1, 1, 2, 2, 3, 3 }

    {1, 2, 3, 4, 5, 6 }

    Returns: 3

  101. {1, 3 }

    {3, 5 }

    Returns: 1

  102. {3, 1, 2 }

    {1, 1, 3 }

    Returns: 1

  103. {1, 2, 3, 4 }

    {1, 1, 1, 1 }

    Returns: 3

  104. {1, 1, 2, 3 }

    {1, 1, 3, 4 }

    Returns: 1

  105. {1, 2 }

    {1, 1 }

    Returns: 1

  106. {1, 1, 1, 1, 1, 2 }

    {1, 2, 3, 4, 5, 9 }

    Returns: 4

  107. {2, 3, 3, 4, 5 }

    {1, 3, 4, 5, 7 }

    Returns: 2

  108. {1, 2 }

    {2, 3 }

    Returns: 1

  109. {1, 1, 1, 1 }

    {1, 1, 1, 1 }

    Returns: 0

  110. {1, 2, 2, 3, 4 }

    {1, 2, 3, 4, 4 }

    Returns: 1

  111. {1, 1, 2 }

    {2, 2, 3 }

    Returns: 2

  112. {2, 2, 4, 5 }

    {1, 2, 3, 4 }

    Returns: 2

  113. {3, 3, 3 }

    {1, 2, 1 }

    Returns: 3

  114. {1, 1, 1, 3, 4 }

    {1, 1, 2, 2, 3 }

    Returns: 2

  115. {2, 1000, 12, 111, 222, 200 }

    {12, 121, 111, 200, 211, 222 }

    Returns: 2

  116. {999, 232 }

    {231, 999 }

    Returns: 1

  117. {1, 1, 4, 2, 2 }

    {1, 3, 2, 4, 2 }

    Returns: 1

  118. {999, 300, 999 }

    {200, 999, 300 }

    Returns: 1

  119. {1, 2, 3 }

    {1, 2, 1 }

    Returns: 1

  120. {1, 1, 1, 1, 1 }

    {5, 5, 5, 5, 5 }

    Returns: 5

  121. {1, 3 }

    {2, 2 }

    Returns: 2

  122. {1, 2, 2, 2 }

    {2, 2, 2, 1 }

    Returns: 0

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