Berlin 2024 CODE100 Quiz and Knowledge rounds
Pseudo Code Quiz Round
These rounds are run on Slido and challengers need to pick an answer on their phones. This means both understanding the question and speed are of the essence.

This function runs for each item in an array,
[4, 6, 8, 7]
. Which number will return true?Function OPTIMUS(num) For each number i from 2 to sqrt(num) If num is divisible by i then Return false End If End For Return true End Function
Question options
 4
 6
 8
 7 (correct answer)
This function will iterate over numbers in an array, and check if the number is a prime number. In this example, 7 is a prime number so will return true. See the prime number CodePen.
(The optimus name was a giveaway…)

Select the ‘nums’ input that will return ‘HUNDRED’.
Function convertNumbersToWord(nums) Set alphabet to "ABCDEFGHIJKLMNOPQRSTUVWXYZ" Set result to an empty string For each num in nums If (num is greater than or equal to 1) and (num is less than or equal to 26) then Append alphabet[num  1] to result Else Return "Invalid number in input" End For Return result End Function
Question options
 [7, 20, 13, 3, 17, 4, 3]
 [8, 21, 14, 4, 18, 5, 4] (correct)
 [6, 19, 12, 2, 16, 3, 2]
 [9, 22, 15, 5, 19, 6, 5]
Notes: The correct answer is [8, 21, 14, 4, 18, 5, 4].
H
is the 8th item in the alphabet string, but there is a1
in there… See the one hundred CodePen. 
Based on the function below, which pair of strings will return true?
Function checkDatesDistance(date1, date2) diffTime = absolute difference in time between date1 and date2 diffDays = convert diffTime to days If diffDays equals 100 then Return true Else Return false End If End Function
Question options:
 new Date(“20240408”), new Date(“20240609”) (correct)
 new Date(“20240201”), new Date(“20240202”)
 new Date(“20240101”), new Date(“20240130”)
 new Date(“20240201”), new Date(“20241231”)
Notes: The first option is correct as the two dates are 100 days apart. See the 100 days CodePen.

If numbers is
[9, 50, 27, 49]
, then which one will be returned by the function?Function findMatchingMultiple(numbers) For i from 1 to infinity For each number in numbers product = i * number If product equals 100 then Return number End If End For End For Return false End Function
Question options:
 9
 50 (correct answer)
 99
 72
Notes: This counts from 1, and multiplies this number by each item in the array. If the result is 100, it should return the number from the array, ie: 50 (* 2). See the double codepen.

Based on the function below, which year will return
6
?```lisp Function calculateCenturiesPassed(year) Set currentYear to 2024 diffYears = difference in years between currentYear and year centuriesPassed = diffYears / 100 centuriesPassed = roundDown(centuriesPassed) Return centuriesPassed End Function
Question options:
 1824
 1948
 1736
 1366 (correct)
Notes : This function takes an input, year, and calculates how many centuries have passed between year and 2024, and return the number.