s to slow down to avoid running into the other cow, becoming part of the same running group.  The cows will run for T minutes (1 &lt;= T &lt;= 1,000,000,000).  Please help Farmer John determine how many groups will be left at this time. Two cows should be considered part of the same group if they are at the same position at the end of T minutes.<br />
</span>在一条无限长的跑道上有N头牛，每头牛有自己的初始位置及奔跑的速度。牛之间不能互相穿透。当一只牛追上另�