Decryption key

A suspicious message has been given to you, encoded with a simple structure. Figure out what this message means to show your skills.

Difficulty: Easy

Median Breach

To prove you are skilled enough to join the team, the director has given you a challenge.

Difficulty: Easy/Moderate

Triple sum

The director is still unsure of your skills. Prove him wrong, and show you are smart enough to join the team. He wants to find all triples in an array such that their sum is equal to the input.

Difficulty: Moderate/Medium

Security feed

Congratulations! You have been accepted to the team! However, the director has encountered an issue. The security feed is broken and the error message is showing a strange binary string!

The input is denoted by a binary string S.

• Your task is to find the maximum number of zeroes possible given the following operation:
• Choose any two indices i and j. Replace either i or j with the bitwise XOR operation of i and j.

Good mood

The stress of being on the team is taking a toll. Each day, your mood fluctuates wildly. Some days are great, and others are filled with despair. Track the longest streak of "good mood days" to determine when you're most effective.

Input is denoted by an array of integers M.

• Each integer represents your mood score for a particular day: positive values are good days, and negative values are bad days.
• Your task is to find the maximum consecutive sum

Zero Sum

Input is denoted by an array of integers N.

• Your task is to find the length of the longest contiguous subarray such that its sum is 0.
• A contiguous subarray is a sequence of elements in an array that are adjacent to each other, e.g. in [1,2,3,4,5] one possible contiguous subarray is [1,2,3] or [2,3,4]

WARNING! This question deducts 40 points for any wrong attempt!

Tuple Checking

Input is denoted by an array of integers A.

• Your task is to find the number of tuples of 4 distinct indices (i,j,k,l) such that (A_i,A_j,A_k,A_l) = (A,W,A,B)

Palindromic addition

Input is denoted by an array of integers P.

• Your task is to find the largest palindromic number that can be made by adding (NOT CONCATENATING) the numbers in the given array.

WARNING! This question deducts 20 points for every wrong attempt!

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