摘要：
二维的数组，比如i，j相加是偶数，目标相加是偶数，则只能经过偶数步，如果所给是奇数步，自然就无需再算，肯定不成功。 阅读全文
摘要：
题目：The doggie found a bone in an ancient maze, which fascinated him a lot. However, when he picked it up, the maze began to shake, and the doggie coul... 阅读全文