摘要：题目描述 Description Kiana 最近沉迷于一款神奇的游戏无法自拔。 简单来说，这款游戏是在一个平面上进行的。 有一架弹弓位于 (0,0)处，每次 Kiana 可以用它向第一象限发射一只红色的小鸟，小鸟们的飞行轨迹均为形如 y=ax^2+bx 的曲线，其中 a,b是 Kiana 指定的参 阅读全文

摘要：题目描述 Description The Pizazz Pizzeria prides itself in delivering pizzas to its customers as fast as possible. Unfortunately, due to cutbacks, they can 阅读全文

摘要：题目描述 Description Once upon a time, there was a traveler. He plans to travel using stagecoaches (horse wagons). His starting point and destination are 阅读全文