439 - Knight Moves Time limit: 3.000 seconds http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=105&page=show_problem&problem=380 http://acm.hdu.edu.cn/showproblem.php?p

题目链接：http://icpc.upc.edu.cn/problem.php?cid=1747&pid=4 题目描述 The Tower shows atall tower perched on the top of a rocky mountain. Lightning strikes, setting the building alight， and two people leap fr