View Compilation Error

0_0_38789893_24511.cpp: In function 'void solve()':
0_0_38789893_24511.cpp:187:9: error: 'read' was not declared in this scope; did you mean 'CCF_NB::read'?
  187 |         read(n);tot=1;st=1;ed=n;
      |         ^~~~
      |         CCF_NB::read
0_0_38789893_24511.cpp:81:58: note: 'CCF_NB::read' declared here
   81 |         template <typename T,typename ...Arg>inline void read(T& x,Arg& ...arg){read(x);read(arg...);}
      |                                                          ^~~~
0_0_38789893_24511.cpp:207:9: error: 'write' was not declared in this scope; did you mean 'CCF_NB::write'?
  207 |         write(dinic(),'\n');
      |         ^~~~~
      |         CCF_NB::write
0_0_38789893_24511.cpp:83:58: note: 'CCF_NB::write' declared here
   83 |         template <typename T,typename ...Arg>inline void write(T x,Arg ...arg){write(x);write(arg...);}
      |                                                          ^~~~~