/in/foo.cc: In function 'int getint()':
/in/foo.cc:27:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(c=='-') q=1,c=getchar(); while (c>='0'&&c<='9') w=w*10+c-'0',c=getchar(); return q?-w:w;
     ^~
/in/foo.cc:27:33: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     if(c=='-') q=1,c=getchar(); while (c>='0'&&c<='9') w=w*10+c-'0',c=getchar(); return q?-w:w;
                                 ^~~~~
/in/foo.cc: In function 'void link(int, int)':
/in/foo.cc:31:2: error: reference to 'next' is ambiguous
  next[++ecnt]=first[x]; first[x]=ecnt; to[ecnt]=y; 
  ^~~~
/in/foo.cc:17:26: note: candidates are: int next [600011]
 int n,m,ecnt,first[MAXN],next[MAXM],to[MAXM],f[MAXN][20],deep[MAXN],ans[MAXN],val[MAXN],tong[MAXN],MAXD,w[MAXN],num[1000011];
                          ^~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/7/bits/stl_iterator_base_funcs.h:208:5: note:                 template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
     next(_ForwardIterator __x, typename
     ^~~~
/in/foo.cc: In function 'void init(int, int)':
/in/foo.cc:35:25: error: reference to 'next' is ambiguous
  for(int i=first[x];i;i=next[i]) 
                         ^~~~
/in/foo.cc:17:26: note: candidates are: int next [600011]
 int n,m,ecnt,first[MAXN],next[MAXM],to[MAXM],f[MAXN][20],deep[MAXN],ans[MAXN],val[MAXN],tong[MAXN],MAXD,w[MAXN],num[1000011];
                          ^~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/7/bits/stl_iterator_base_funcs.h:208:5: note:                 template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
     next(_ForwardIterator __x, typename
     ^~~~
/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:63:28: error: reference to 'next' is ambiguous
     for(int i=first[x];i;i=next[i]) 
                            ^~~~
/in/foo.cc:17:26: note: candidates are: int next [600011]
 int n,m,ecnt,first[MAXN],next[MAXM],to[MAXM],f[MAXN][20],deep[MAXN],ans[MAXN],val[MAXN],tong[MAXN],MAXD,w[MAXN],num[1000011];
                          ^~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/7/bits/stl_iterator_base_funcs.h:208:5: note:                 template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
     next(_ForwardIterator __x, typename
     ^~~~
/in/foo.cc: In function 'void DFS(int, int)':
/in/foo.cc:79:28: error: reference to 'next' is ambiguous
     for(int i=first[x];i;i=next[i]) 
                            ^~~~
/in/foo.cc:17:26: note: candidates are: int next [600011]
 int n,m,ecnt,first[MAXN],next[MAXM],to[MAXM],f[MAXN][20],deep[MAXN],ans[MAXN],val[MAXN],tong[MAXN],MAXD,w[MAXN],num[1000011];
                          ^~~~
In file included from /usr/include/c++/7/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/7/bits/char_traits.h:39,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/7/bits/stl_iterator_base_funcs.h:208:5: note:                 template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
     next(_ForwardIterator __x, typename
     ^~~~
/in/foo.cc: In function 'void work()':
/in/foo.cc:100:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=1;i<=n;i++) w[i]=getint(); deep[1]=1; init(1,0); 
     ^~~
/in/foo.cc:100:42: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
     for(int i=1;i<=n;i++) w[i]=getint(); deep[1]=1; init(1,0); 
                                          ^~~~