/in/foo.cc: In function 'int LCA(int, int)':
/in/foo.cc:38:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=lim;i>=0;i--)
  ^~~
/in/foo.cc:41:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return fa[x][0];
   ^~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:79:5: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
   if(fa[fx][0] && (dis[x]-dis[fa[fx][0]])*2==tmp)
     ^