这只蒟蒻把 typ[i] == typ[0] && typ[i+1] == typ[in-1]
typ[i] == typ[0] && typ[i+1] == typ[in-1]
打成了 typ[i] == typ[0] || typ[i+1] == typ[in-1]
typ[i] == typ[0] || typ[i+1] == typ[in-1]