SOLUTION

There is a Unicode encoding that uses 4 bytes per character. It’s called UTF-32 because 32 bits = 4 bytes. UTF-32 is a straightforward and fixed-width encoding; it takes each Unicode character (a 4-byte number) and represents the character with that same number. This has some advantages, the most important being that you can find the Nth character of a string in constant time because the Nth character starts at the 4xNth byte.