国题 stack
注意了注意了，这回一定是 stack！
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P4382 [八省联考 2018] 劈配
https://www.luogu.com.cn/problem/P4382
P4384 [八省联考 2018] 制胡窜
https://www.luogu.com.cn/problem/P4384
P4363 [九省联考 2018] 一双木棋 chess
https://www.luogu.com.cn/problem/P4363
P8291 [省选联考 2022] 学术社区
https://www.luogu.com.cn/problem/P8291
P5289 [十二省联考 2019] 皮配
https://www.luogu.com.cn/problem/P5289
P6621 [省选联考 2020 A 卷] 魔法商店
https://www.luogu.com.cn/problem/P6621
P3699 [CQOI2017]小Q的草稿
https://www.luogu.com.cn/problem/P3699
P3700 [CQOI2017]小 Q 的表格
https://www.luogu.com.cn/problem/P3700
P3724 [AHOI2017/HNOI2017]大佬
https://www.luogu.com.cn/problem/P3724
P3735 [HAOI2017]字符串
https://www.luogu.com.cn/problem/P3735
P3770 [CTSC2017]密钥
https://www.luogu.com.cn/problem/P3770
P3771 [CTSC2017]网络
https://www.luogu.com.cn/problem/P3771
P3774 [CTSC2017]最长上升子序列
https://www.luogu.com.cn/problem/P3774
P3780 [SDOI2017]苹果树
https://www.luogu.com.cn/problem/P3780
P3783 [SDOI2017]天才黑客
https://www.luogu.com.cn/problem/P3783
P3992 [BJOI2017]开车
https://www.luogu.com.cn/problem/P3992
P4339 [ZJOI2018]迷宫
https://www.luogu.com.cn/problem/P4339
P4425 [HNOI/AHOI2018]转盘
https://www.luogu.com.cn/problem/P4425
P4428 [BJOI2018]二进制
https://www.luogu.com.cn/problem/P4428
P4429 [BJOI2018]染色
https://www.luogu.com.cn/problem/P4429
