title: Number Indexes Equal Elements Given Range
signature: function number_indexes_equal_elements_given_range(a, n, l, r)
test_code: 
  
  -- SOLUTION CODE
  -- ============================================
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  function isCorrect(actual, expected)
      if type(expected) ~= type(actual) then
          return false
      end
      
      if type(expected) == 'table' then
          for k,v_expected in pairs(expected) do
              
              if actual[k] == nil then
                  return false
              end
              local v_actual = actual[k]
              if not isCorrect(v_actual, v_expected) then
                  return false
              end
              actual[k]=nil
          end
      
          if next(actual) then 
              return false
          end
          return true
      else
          return actual == expected
      end
  end
  
  function validateSolution(actual, expected)
      return isCorrect(actual,expected)
  end
  
  function driver(a, n, l, r, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(a, n, l, r) 
      end)
      if status then
          if validateSolution(exec_result,expected) then
              return "PASSED"
          end
          return "FAILED"
      else
          return string.format("ERROR=%s",string.gsub(error_msg,".*:[%d]+: ",""))
      end
  end
      
  function main()
      result = driver({4, 13, 13, 16, 16, 19, 39, 41, 48, 52, 57, 62, 65, 67, 76, 84, 88, 91, 95, 96, 97, 98}, 18, 12, 17, 0)
      print(string.format("TEST-0...%s",result))
  
      result = driver({62, 76, 86, -8, 84, -6, 72, 84, 6, -50, -18, -94, 54, 90, -74, -64, -26, -14, -32, 62, 10, 4, 70, -28, 8, 18, 4, -62, -76, 84, -78, -4, 84, 98, 58, -68, 42, -6, 34, -38, 52, -84, 78}, 32, 38, 23, 0)
      print(string.format("TEST-1...%s",result))
  
      result = driver({0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1}, 10, 6, 6, 0)
      print(string.format("TEST-2...%s",result))
  
      result = driver({11, 75, 98, 29, 62, 53, 48, 91, 86, 66, 48, 94}, 8, 6, 6, 0)
      print(string.format("TEST-3...%s",result))
  
      result = driver({-94, -84, -70, -70, -40, -40, -36, -24, 10, 48, 62, 74}, 11, 7, 8, 0)
      print(string.format("TEST-4...%s",result))
  
      result = driver({1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0}, 36, 40, 37, 0)
      print(string.format("TEST-5...%s",result))
  
      result = driver({1, 2, 6, 7, 10, 11, 13, 19, 19, 25, 29, 30, 32, 34, 35, 45, 45, 46, 47, 48, 48, 53, 58, 61, 64, 65, 67, 75, 76, 81, 81, 84, 84, 85, 86, 94, 94, 96, 99}, 25, 19, 37, 4)
      print(string.format("TEST-6...%s",result))
  
      result = driver({-56, 42, -34, -12, -86, 82, -96, -66, 30, 16, -40, 72, 84, 94, -48, -30, 26, 50, 42, -44, -50, 22, -38, 8, 34, 94, 2, 16, -32, 18, -58, 12, -26, 28, -62}, 21, 30, 26, 0)
      print(string.format("TEST-7...%s",result))
  
      result = driver({0, 0, 0, 0, 1, 1, 1}, 4, 5, 5, 0)
      print(string.format("TEST-8...%s",result))
  
      result = driver({6, 29}, 1, 1, 1, 0)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def number_indexes_equal_elements_given_range(a, n, l, r):
      count = 0
      for i in range(l, r):
          if (a[i] == a[(i + 1)]):
              count += 1
      return count
source_cpp: int number_indexes_equal_elements_given_range(vector<int> a, int n, int l, int r) {
    int count = 0;
    for ( int i = l;
    i < r;
    i ++ ) if ( a [ i ] == a [ i + 1 ] ) count += 1;
    return count;
  }