摘要：
题面： Last night you robbed a bank but couldn't escape and when you just got outside today, the police started chasing you. The city, where you live in, 阅读全文
摘要：
题面： You are given a 3D grid, which has dimensions X, Y and Z. Each of the X x Y x Z cells contains a light. Initially all lights are off. You will hav 阅读全文