[Codeforces] games (R1600) Part.1 题单:https://codeforces.com/problemset?tags=games,1201-1600 74B. Train 原题指路:https://codeforces.com/problemset/problem/74/B 题意 ( 2 s 2\ \mathrm{s} 2 s) 偷渡者(Stowaway