不是最大匹配大小$\times 2$吗
by newbie314159 @ 2020-10-24 16:07:57
@[newbie314159](/user/54979) 也是，gcz 爷爷能给一个证明吗/kel
by Karry5307 @ 2020-10-24 16:17:07
可以看CF1067E题解
by newbie314159 @ 2020-10-24 16:18:37
@[newbie314159](/user/54979) 感谢 gcz 爷爷教育/se/se
by Karry5307 @ 2020-10-24 16:19:38