2018年3月13日
1015. Reversible Primes (20)
摘要： A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal system 73 is a re 阅读全文
posted @ 2018-03-13 10:57 yuxiaoba 阅读(122) 评论(0) 推荐(0)
1013. Battle Over Cities (25)（DFS遍历）
摘要： For example, if we have 3 cities and 2 highways connecting city1-city2 and city1-city3. Then if city1 is occupied by the enemy, we must have 1 highway 阅读全文
posted @ 2018-03-13 08:56 yuxiaoba 阅读(189) 评论(0) 推荐(0)