How should I practice HexSpeak?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Virtu Financial online assessment problems in FastPrep.

Is HexSpeak associated with Virtu Financial?

FastPrep tags this as a Virtu Financial online assessment coding practice problem when the problem catalog has that company and stage context.

Problem · String

HexSpeak

Learn this problem

● Easy

Virtu FinancialINTERNOA

Problem statement

You are given a string s that encodes a decimal integer. Convert that integer to its uppercase hexadecimal representation.

Then replace every 0 with O and every 1 with I. The result is a valid HexSpeak word only if every character belongs to A, B, C, D, E, F, I, or O.

Return the HexSpeak word if it is valid. Otherwise, return "ERROR".

Function

toHexspeak(s: String) → String

Examples

Example 1

s = "257"return = "IOI"

The decimal number 257 is 101 in hexadecimal. Replacing 1 with I and 0 with O gives "IOI".

Example 2

s = "3"return = "ERROR"

The decimal number 3 is 3 in hexadecimal. Since 3 is not a valid HexSpeak character, return "ERROR".

Constraints

1 <= value(s) <= 10^12
s is a valid decimal representation of an integer in this range.