/in/foo.cc: In function 'void update_Mark(int, int)':
/in/foo.cc:48:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(leaf) flag = 0; Mark[u] = flag;
  ^~
/in/foo.cc:48:21: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  if(leaf) flag = 0; Mark[u] = flag;
                     ^~~~
/in/foo.cc: In function 'bool check(long long int)':
/in/foo.cc:62:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(LL i = start; i < vec[v].size(); i++) 
                     ~~^~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:86:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   LL mid = l + r >> 1;
            ~~^~~