## [A](https://codeforces.me/contest/2021/problem/A). Meaning Mean↵
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Author: [user:athin,2024-10-07] ↵
Developer: [user:ArvinCiu,2024-10-07] ↵
Editorial: [user:Kinon,2024-10-08] ↵
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<spoiler summary="Tutorial">↵
[tutorial:2021A]↵
</spoiler>↵
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## [B](https://codeforces.me/contest/2021/problem/B). Maximize Mex↵
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Author: [user:joelgun14,2024-10-07] ↵
Developer: [user:joelgun14,2024-10-07], [user:CyberSleeper,2024-10-07] ↵
Editorial: [user:Pyqe,2024-10-08] ↵
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<spoiler summary="Tutorial">↵
[tutorial:2021B]↵
</spoiler>↵
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## [C](https://codeforces.me/contest/2021/problem/C2). Adjust The Presentation↵
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Author: [user:ArvinCiu,2024-10-07] ↵
Developer: [user:icebear30,2024-10-07], [user:gansixeneh,2024-10-07] ↵
Editorial: [user:Pyqe,2024-10-11] ↵
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<spoiler summary="Tutorial">↵
[tutorial:2021C2]↵
</spoiler>↵
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## [D](https://codeforces.me/contest/2021/problem/D). Boss, Thirsty↵
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Author: [user:ArvinCiu,2024-10-07] ↵
Developer: [user:CyberSleeper,2024-10-07] ↵
Editorial: [user:Pyqe,2024-10-08] ↵
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<spoiler summary="Tutorial">↵
[tutorial:2021D]↵
</spoiler>↵
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## [E](https://codeforces.me/contest/2021/problem/E3). Digital Village↵
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Author: [user:CyberSleeper,2024-10-07] ↵
Developer: [user:ArvinCiu,2024-10-07] ↵
Editorial: [user:Pyqe,2024-10-19]↵
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<spoiler summary="Tutorial">↵
[tutorial:2021E3]↵
</spoiler>↵
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Author: [user:athin,2024-10-07] ↵
Developer: [user:ArvinCiu,2024-10-07] ↵
Editorial: [user:Kinon,2024-10-08] ↵
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<spoiler summary="Tutorial">↵
[tutorial:2021A]↵
</spoiler>↵
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## [B](https://codeforces.me/contest/2021/problem/B). Maximize Mex↵
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Author: [user:joelgun14,2024-10-07] ↵
Developer: [user:joelgun14,2024-10-07], [user:CyberSleeper,2024-10-07] ↵
Editorial: [user:Pyqe,2024-10-08] ↵
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<spoiler summary="Tutorial">↵
[tutorial:2021B]↵
</spoiler>↵
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## [C](https://codeforces.me/contest/2021/problem/C2). Adjust The Presentation↵
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Author: [user:ArvinCiu,2024-10-07] ↵
Developer: [user:icebear30,2024-10-07], [user:gansixeneh,2024-10-07] ↵
Editorial: [user:Pyqe,2024-10-11] ↵
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<spoiler summary="Tutorial">↵
[tutorial:2021C2]↵
</spoiler>↵
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## [D](https://codeforces.me/contest/2021/problem/D). Boss, Thirsty↵
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Author: [user:ArvinCiu,2024-10-07] ↵
Developer: [user:CyberSleeper,2024-10-07] ↵
Editorial: [user:Pyqe,2024-10-08] ↵
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<spoiler summary="Tutorial">↵
[tutorial:2021D]↵
</spoiler>↵
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## [E](https://codeforces.me/contest/2021/problem/E3). Digital Village↵
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Author: [user:CyberSleeper,2024-10-07] ↵
Developer: [user:ArvinCiu,2024-10-07] ↵
Editorial: [user:Pyqe,2024-10-19]↵
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<spoiler summary="Tutorial">↵
[tutorial:2021E3]↵
</spoiler>↵
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