# SkyWT

#### 我们的征途是星辰大海

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CSAPP 是 CMU 享誉全球的课程，尤其以其 lab 难度之高著称。这是课程的第一个 lab：datalab，为了让我们熟练掌握计算机中的数据存储而设计。

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Educational Codeforces Round 71 (Rated for Div. 2)

# F - Remainder Problem

## Description

*2100

• 1 x y：将 $a_x$ 增加 $y$；
• 2 x y：计算 $\sum\limits_{i \in R(x, y)} a_i$，其中 $R(x,y)$ 表示 1 到 500000 中模 $x$ 余 $y$ 的数字集合。

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2019.11.07 Upd：其实不是真的完结了，有些题目实在搞不动 QwQ

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# D - Power Products

## Description

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Codeforces Round #578 (Div. 2)

# D - White Lines

## Description

*1900

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Codeforces Round #581 (Div. 2) 比赛链接：LInk

# C - Anna, Svyatoslav and Maps

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Link

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## Description

Link

Ivan wants to make a necklace as a present to his beloved girl. A necklace is a cyclic sequence of beads of different colors. Ivan says that necklace is beautiful relative to the cut point between two adjacent beads, if the chain of beads remaining after this cut is a palindrome (reads the same forward and backward).

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