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+// 3304. Find the K-th Character in String Game I
+#include "leetcode.h"
+
+/*
+ * 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 forwever: generate a new string by changing each
+ * character in 'word' to its next character in the english alphabet and append
+ * it to the original 'word'. return the value of the k'th character in 'word'
+ * after enough operations have been done for 'word' to have at least 'k'
+ * characters. note that character 'z' can be changed to 'a' in the operation.
+ */
+
+char kthCharacter(int k) { return 'a' + __builtin_popcount(k - 1); }
+
+int main() {
+ printf("%c\n", kthCharacter(5)); // expect: b
+ printf("%c\n", kthCharacter(10)); // expect: c
+}