title: Search An Element In An Array Where Difference Between Adjacent Elements Is 1
signature: function search_an_element_in_an_array_where_difference_between_adjacent_elements_is_1(arr, n, x)
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(arr, n, x, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(arr, n, x) 
      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({8, 7, 6, 7, 6, 5, 4, 3, 2, 3, 4, 3}, 12, 3, 7)
      print(string.format("TEST-0...%s",result))
  
      result = driver({6, 90}, 1, 1, -1)
      print(string.format("TEST-1...%s",result))
  
      result = driver({1, 2, 3, 4, 5, 4}, 6, 5, 4)
      print(string.format("TEST-2...%s",result))
  
      result = driver({97, 35, 60, 96, 3, 67, 72, 95, 55, 9, 69, 28, 15, 91, 31, 59}, 15, 9, -1)
      print(string.format("TEST-3...%s",result))
  
      result = driver({-84, -78, -74, -70, -68, -60, -56, -54, -48, -46, -28, -16, -6, 0, 0, 8, 8, 8, 12, 16, 26, 30, 32, 34, 36, 40, 46, 48, 70, 70, 72, 76, 78, 78, 80, 84, 84, 86}, 22, 31, -1)
      print(string.format("TEST-4...%s",result))
  
      result = driver({1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1}, 5, 7, -1)
      print(string.format("TEST-5...%s",result))
  
      result = driver({55, 64, 76, 79, 93, 96}, 4, 4, -1)
      print(string.format("TEST-6...%s",result))
  
      result = driver({66, -90, 98, -50, 0, 46, 42, 64, -96, -80, -96, 20, -10, -84}, 8, 13, -1)
      print(string.format("TEST-7...%s",result))
  
      result = driver({0, 0, 0, 0, 0, 0, 1}, 6, 5, -1)
      print(string.format("TEST-8...%s",result))
  
      result = driver({94, 4, 34, 87, 32, 3, 92, 68, 57, 76, 24, 33, 3, 4, 30, 70, 49, 30, 72, 82, 16, 53, 6, 24, 92, 96, 89, 28, 21, 8, 36, 9, 40, 85, 51, 1, 63, 68, 74, 26, 40, 3, 9, 32, 67, 4, 6, 73}, 25, 25, -1)
      print(string.format("TEST-9...%s",result))
  
  end
  
  main()
source_py: def search_an_element_in_an_array_where_difference_between_adjacent_elements_is_1(arr, n, x):
      i = 0
      while (i < n):
          if (arr[i] == x):
              return i
          i = (i + abs((arr[i] - x)))
      print('number is not present!')
      return (- 1)
source_cpp: int search_an_element_in_an_array_where_difference_between_adjacent_elements_is_1(vector<int> arr, int n, int x) {
    int i = 0;
    while ( i < n ) {
      if ( arr [ i ] == x ) return i;
      i = i + abs ( arr [ i ] - x );
    }
    return - 1;
  }