LeetCode 3309. Maximum Possible Number by Binary Concatenation
weekly contest 418。 這題用 python 寫起來是真方便。
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LeetCode 3307. Find the K-th Character in String Game II
weekly contest 417。 體感不太難，但是被 Q3 浪費太久，早知道先做這題。
LeetCode 3306. Count of Substrings Containing Every Vowel and K Consonants II
weekly contest 417。
LeetCode 3305. Count of Substrings Containing Every Vowel and K Consonants I
weekly contest 417。
LeetCode 3304. Find the K-th Character in String Game I
weekly contest 417。