摘要:
https://www.lydsy.com/JudgeOnline/problem.php?id=2111 https://www.luogu.org/problemnew/show/P2606#sub 称一个1,2,...,N的排列P1,P2...,Pn是Magic的,当且仅当2<=i<=N时,P 阅读全文
摘要:
https://www.lydsy.com/JudgeOnline/problem.php?id=2425 https://www.luogu.org/problemnew/show/P2518 你有一组非零数字(不一定唯一),你可以在其中插入任意个0,这样就可以产生无限个数。比如说给定{1,2}, 阅读全文