0_0_22082020_14399.cpp: In function 'void dfs(int)':
0_0_22082020_14399.cpp:33:2: error: 'vis' was not declared in this scope
vis[x]=1;
^
0_0_22082020_14399.cpp:35:23: error: reference to 'next' is ambiguous
for (i=head[x]; i; i=next[i]){
^
0_0_22082020_14399.cpp:13:14: note: candidates are: int next [20020]
int ver[N*2],next[N*2],head[N],tot,n,m,a[N],b[N],cnt,d[N],f[N][22];
^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:61,
from 0_0_22082020_14399.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:184:5: note: template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
next(_ForwardIterator __x, typename
^
0_0_22082020_14399.cpp: In function 'int get_lca(int, int)':
0_0_22082020_14399.cpp:50:12: error: 'depth' was not declared in this scope
int dc=depth[x]-depth[y];
^
0_0_22082020_14399.cpp:52:17: error: 'M' was not declared in this scope
for (i=0;i<=M;i++)
^
0_0_22082020_14399.cpp: In function 'int main()':
0_0_22082020_14399.cpp:103:6: error: expected primary-expression before ';' token
x+; y++;
^
0_0_22082020_14399.cpp:104:11: error: 'add' was not declared in this scope
add(x,y);
^
0_0_22082020_14399.cpp:107:10: error: 'vis' was not declared in this scope
memset(vis,0,sizeof(vis));
^
0_0_22082020_14399.cpp:113:17: error: 'M' was not declared in this scope
for (j=1; j<=M; j++){
^
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