摘要：
GCD XORGiven an integer N, nd how many pairs (A; B) are there such that: gcd(A; B) = A xor B where1 B A N.Here gcd(A; B) means the greatest com... 阅读全文
摘要：
Conquer a New RegionTime Limit:5 Seconds Memory Limit:32768 KBThe wheel of the history rolling forward, our king conquered a new region in a distant c... 阅读全文