Alice and Bob are playing a game. Initially, Alice has a string word = "a".
You are given a positive integer k.
Now Bob will ask Alice to perform the following operation forever:
\n\nword to its next character in the English alphabet, and append it to the original word.For example, performing the operation on "c" generates "cd" and performing the operation on "zb" generates "zbac".
Return the value of the kth character in word, after enough operations have been done for word to have at least k characters.
Note that the character 'z' can be changed to 'a' in the operation.
\n
Example 1:
\n\nInput: k = 5
\n\nOutput: "b"
\n\nExplanation:
\n\nInitially, word = "a". We need to do the operation three times:
"b", word becomes "ab"."bc", word becomes "abbc"."bccd", word becomes "abbcbccd".Example 2:
\n\nInput: k = 10
\n\nOutput: "c"
\n\n
Constraints:
\n\n1 <= k <= 500Compiled with clang 17 using the latest C++ 23 standard, and libstdc++ provided by GCC 13.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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\\r\\n\\r\\nUsing #lang racket
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