foo.cc:6:14: error: 'MAXN' was not declared in this scope
    6 | int cnt,head[MAXN];
      |              ^~~~
foo.cc:13:7: error: 'MAXM' was not declared in this scope
   13 | }edge[MAXM];
      |       ^~~~
foo.cc: In function 'void add_edge(int, int)':
foo.cc:17:9: error: 'edge' was not declared in this scope
   17 |         edge[++cnt].u=u;
      |         ^~~~
foo.cc:19:23: error: 'head' was not declared in this scope; did you mean 'read'?
   19 |         edge[cnt].nxt=head[u];
      |                       ^~~~
      |                       read
foo.cc: In function 'int main()':
foo.cc:31:38: error: 'head' was not declared in this scope; did you mean 'read'?
   31 |                 for(int i=1;i<=n;++i)head[i]=0;
      |                                      ^~~~
      |                                      read
foo.cc:41:24: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
   41 |                 printf('\n');
      |                        ^~~~
      |                        |
      |                        char
In file included from /nix/gcc-13.3.0/include/c++/13.3.0/cstdio:42,
                 from /nix/gcc-13.3.0/include/c++/13.3.0/ext/string_conversions.h:45,
                 from /nix/gcc-13.3.0/include/c++/13.3.0/bits/basic_string.h:4109,
                 from /nix/gcc-13.3.0/include/c++/13.3.0/string:54,
                 from /nix/gcc-13.3.0/include/c++/13.3.0/bitset:52,
                 from /nix/gcc-13.3.0/include/c++/13.3.0/x86_64-unknown-linux-gnu/bits/stdc++.h:52,
                 from foo.cc:1:
/nix/glibc-2.40-66-dev/include/stdio.h:363:43: note:   initializing argument 1 of 'int printf(const char*, ...)'
  363 | extern int printf (const char *__restrict __format, ...);
      |                    ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
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