LeetCode 3399. Smallest Substring With Identical Characters II
weekly contest 429。
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LeetCode 3398. Smallest Substring With Identical Characters I
weekly contest 429。 Q3 和 Q4 答案通用，而且不算太難，但我犯了兩個錯誤：
LeetCode 3397. Maximum Number of Distinct Elements After Operations
weekly contest 429。
LeetCode 3396. Minimum Number of Operations to Make Elements in Array Distinct
weekly contest 429。
LeetCode 3389. Minimum Operations to Make Character Frequencies Equal
weekly contest 428。 補題發現其實沒很難，主要是前面 Q3 讓人整個心態崩潰，根本沒時間看 Q4。