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====== 2020/07/26 -- 2020/07/31 周报 ======
===== 团队训练 =====
2020.07.27 [[https://ac.nowcoder.com/acm/contest/5671|2020牛客暑期多校训练营（第六场）]]
===== 本周推荐 =====
==== airbust ====
无
==== kazamori ====
无
==== Ket98 ====
Fraction Construction Problem
https://ac.nowcoder.com/acm/contest/5668/F
分类：数学
这题考察的数学知识很棒，证明也很精彩，所以作为推荐题目。
题目大意：给定两个整数 $a,b$，找出四个整数 $c,d,e,f$ 满足：
（1）$\frac{c}{d}-\frac{e}{f}=\frac{a}{b}$
（2）$d