[Luogu] 逛公园

https://www.luogu.org/problemnew/show/P3953 https://www.zybuluo.com/wsndy-xx/note/1134388     #include<cstdio> #include<cstring> #include<cctype> using namespace std; const int N=1e5+1,K=51; int n,m

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