/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:9:8: error: 'cnt' cannot be used as a function
    9 |     cnt(deep%2)++;
      |     ~~~^~~~~~~~
/in/foo.cc:10:9: error: 'i' was not declared in this scope
   10 |     for(i=0;i<g[u].size();i++)
      |         ^