题目:链接 题意:给出26个大写字母的置换B,问是否存在一个置换A,使得A^2 = B 思路:总结一个规律:两个长度为n的相同循环相乘,当n为奇数时结果也是一个长度为n的循环;当n为偶数的时候分裂成两个长度为n/2的循环,所以对于一个长度为n的奇数循环都能找到一个长度为n的循环使得A^2=B,对于两个长度都为n的不相交的循环(不要求是偶数)B和C,都能找到一个长度为2n的循环A,使
Description — I just bought Leonardo’s secret notebook! Rare object collector Stan Ucker was really agitated but his friend, special investigator Sarah Keptic was unimpressed. — How do you know it