题目宣传版

- [a+b问题](https://www.luogu.org/problemnew/show/U26043) - [数组的进与出](https://www.luogu.org/problemnew/show/U26108) - [a-b问题](https://www.luogu.org/problemnew/show/U26550) - [数组的进与出（升级版）](https://www.luogu.org/problemnew/show/U28026) - [a*b问题](https://www.luogu.org/problemnew/show/U26985) - [比武场](https://www.luogu.org/problemnew/show/U27071) - [Hello World!](https://www.luogu.org/problemnew/show/U27259) - [屠宰场](https://www.luogu.org/problemnew/show/U27263) - [a/b问题](https://www.luogu.org/problemnew/show/U28364) - [比武场（升级版）](https://www.luogu.org/problemnew/show/U29023) - [a整除b问题](https://www.luogu.org/problemnew/show/U30853) - [MC屠龙战1：灾难](https://www.luogu.org/problemnew/show/U30958) - [a取余b问题](https://www.luogu.org/problemnew/show/U31643) - [MC屠龙战2：逃脱](https://www.luogu.org/problemnew/show/U31666) - [求三角形的周长](https://www.luogu.org/problemnew/show/U35036) - [电梯优先方案](https://www.luogu.org/problemnew/show/U36421) - [a+b问题（升级版）](https://www.luogu.org/problemnew/show/U38707)