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G. ABBC or BACB You are given a string $s$ made up of characters $\texttt{A}$ and $\texttt{B}$. Initially you have no coins. You can perform two types 阅读全文
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C. Card Game There are $n$ cards stacked in a deck. Initially, $a_{i}$ is written on the $i$-th card from the top. The value written on a card does no 阅读全文
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D. Sum of XOR Functions You are given an array $a$ of length $n$ consisting of non-negative integers. You have to calculate the value of $\sum_{l=1}^{ 阅读全文
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D. Effects of Anti Pimples Chaneka has an array $[a_1,a_2,\ldots,a_n]$. Initially, all elements are white. Chaneka will choose one or more different i 阅读全文
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D. Prefix Purchase You have an array $a$ of size $n$, initially filled with zeros ($a_1 = a_2 = \ldots = a_n = 0$). You also have an array of integers 阅读全文
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Python缩进 在 Python 中，代码块没有显式的开始/结束或大括号来标记代码块的开始和结束。 相反，代码块是通过缩进定义的。 我们考虑一个极其简化的 Python 子集，其只有两种类型的语句：简单语句和 $For$ 语句。 简单语句（Simple statements）仅占一行，每行一个。 阅读全文
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D1. Candy Party (Easy Version) This is the easy version of the problem. The only difference is that in this version everyone must give candies to exac 阅读全文
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String Transformation You are given two strings s and t of equal length n. You can perform the following operation on the string s: Remove a suffix of 阅读全文
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F. Selling a Menagerie You are the owner of a menagerie consisting of $n$ animals numbered from $1$ to $n$. However, maintaining the menagerie is quit 阅读全文