Specialist Engineer

Start by assuming the first number in the list is the biggest.
Look at each number in the list one by one.
If you find a number bigger than your current biggest number, remember that new number as the biggest.
Continue until you've looked at all numbers.
The last biggest number you remember is the largest in the list.
Example:
For the list [3, 1, 4, 7, 2], you'll first think 3 is the biggest. Then you see 4 and think it's bigger. Finally, you see 7 and know it's the biggest.

Create a little note (or a tally) for each number, recording how many times you've seen it.
Go through the list and add to the note every time you see a number.
Then, look at the list again from the start.
The first number with only one mark on its note is the unique number you're looking for.
Example:
For the list [4, 5, 1, 2, 1, 4, 5, 6, 7, 6], you'll note that numbers 4, 5, and 6 appear twice, but number 2 appears only once, and it's the first one to do so.

Use two tools: a list (or an array) and a map (or a dictionary).
When adding a number, put it at the end of the list and also note down its position in the map.
When removing, replace the number with the last item in the list and update that item's noted position in the map.
To get a random item, just pick any position in the list.
Simple Explanation:
Imagine you have a row of boxes (that's your list) and a magic book that tells you where each number is (that's your map). To add a number, just put it in a new box at the end and write its position in the magic book. To remove a number, swap it with the last number, remove the last box, and update the magic book. To pick a random number, just point to any box!

Begin with the base class Animal having attributes common to all animals, like name, age, species, etc.

Create subclasses for specific animal types like Mammals, Birds, Reptiles, inheriting from the base class.

Showcase polymorphism by having methods that behave differently in subclasses.

Use Floyd’s cycle-finding algorithm (two-pointer technique). One pointer moves two steps while the other moves one step. If there's a cycle, they'll meet.

Traverse the array once to find the largest number.
Traverse again to find the largest number which is less than the previously found largest number.

Tip 1:Utilize a subquery to pinpoint and exclude the top salary.
Tip 2:Apply the MAX() function to identify the second highest value from the filtered records.
Tip 3:Ensure the solution handles cases of repeated top salaries.