摘要：
A group of commandos were assigned a critical task. They are to destroy an enemy head quarter. The enemy head quarter consists of several buildings an 阅读全文
摘要：
K people are having a picnic. They are initially in N cities, conveniently numbered from 1 to N. The roads between cities are connected by M one-way r 阅读全文
摘要：
XX星有许多城市，城市之间通过一种奇怪的高速公路SARS(Super Air Roam Structure 超级空中漫游结构）进行交流，每条SARS都对行驶在上面的Flycar限制了固定的Speed，同时XX星人对 Flycar的“舒适度”有特殊要求，即乘坐过程中最高速度与最低速度的差越小乘坐越舒服 阅读全文