/in/foo.cc: In function 'int getint()':
/in/foo.cc:23:5: 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:23:33: 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:25:32: error: reference to 'next' is ambiguous
 inline void link(int x,int y){ next[++ecnt]=first[x]; first[x]=ecnt; to[ecnt]=y; }
                                ^~~~
/in/foo.cc:18:26: 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:2:
/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:26:56: error: reference to 'next' is ambiguous
 inline void init(int x,int fa){ for(int i=first[x];i;i=next[i]) { int v=to[i]; if(v==fa) continue; deep[v]=deep[x]+1; init(v,x); f[v][0]=x; } }
                                                        ^~~~
/in/foo.cc:18:26: 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:2:
/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 'int lca(int, int)':
/in/foo.cc:28:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if(deep[x]<deep[y]) swap(x,y); int t=0; while((1<<t)<=deep[x]) t++; t--;
     ^~
/in/foo.cc:28:36: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     if(deep[x]<deep[y]) swap(x,y); int t=0; while((1<<t)<=deep[x]) t++; t--;
                                    ^~~
/in/foo.cc:29:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=t;i>=0;i--) if(deep[x]-(1<<i)>=deep[y]) x=f[x][i]; if(x==y) return y;
     ^~~
/in/foo.cc:29:66: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
     for(int i=t;i>=0;i--) if(deep[x]-(1<<i)>=deep[y]) x=f[x][i]; if(x==y) return y;
                                                                  ^~
/in/foo.cc:30:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=t;i>=0;i--) if(f[x][i]!=f[y][i]) x=f[x][i],y=f[y][i]; return f[x][0];
     ^~~
/in/foo.cc:30:69: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
     for(int i=t;i>=0;i--) if(f[x][i]!=f[y][i]) x=f[x][i],y=f[y][i]; return f[x][0];
                                                                     ^~~~~~
/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:35:28: error: reference to 'next' is ambiguous
     for(int i=first[x];i;i=next[i]) {
                            ^~~~
/in/foo.cc:18:26: 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:2:
/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:45:28: error: reference to 'next' is ambiguous
     for(int i=first[x];i;i=next[i]) {
                            ^~~~
/in/foo.cc:18:26: 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:2:
/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:56:5: 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); for(int i=1;i<=n;i++) MAXD=max(MAXD,deep[i]);
     ^~~
/in/foo.cc:56:42: 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); for(int i=1;i<=n;i++) MAXD=max(MAXD,deep[i]);
                                          ^~~~