Codeforces Round #378 (Div. 2)C.Epidemic in Monstropolis（codeforces733c）
题目链接：codeforces733c题意：给你nn个数，a1,a2,a3,...ana_{1},a_{2},a_{3},...a_{n},再给你m个数b1,b2,b3,...bmb_{1},b_{2},b_{3},...b_{m}，问你aa序列能否通过合并变成bb序列。合并的条件为只能相邻的数合并，ai与ai+1a_{i}与a_{i+1}能合并的条件为ai>ai+1或ai<ai+1a_{i}>a_
