版权声明：转载注明出处，谢谢，有问题可以向博主联系 https://blog.csdn.net/VictoryCzt/article/details/84673669
https://www.luogu.org/problemnew/show/P4723
https://www.luogu.org/problemnew/show/P4929
https://www.luogu.org/problemnew/show/P4782
https://www.luogu.org/problemnew/show/P4724
https://www.luogu.org/problemnew/show/P4512
https://www.luogu.org/problemnew/show/P3835
https://www.luogu.org/problemnew/show/P5050
https://www.luogu.org/problemnew/show/P4726
https://www.luogu.org/problemnew/show/P4725
https://www.luogu.org/problemnew/show/P3380
https://www.luogu.org/problemnew/show/P5055
https://www.luogu.org/problemnew/show/P4239
https://www.luogu.org/problemnew/show/P5043
luogu突然多了好多模板啊，QWQ