/in/foo.cc: In function 'void dfs1(int)':
/in/foo.cc:20:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(v==fa[u][0]) continue; fa[v][0]=u;
   ^~
/in/foo.cc:20:29: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   if(v==fa[u][0]) continue; fa[v][0]=u;
                             ^~