foo.cc: In function 'void dts::tr_dfs1(dts::ll, dts::ll)':
foo.cc:29:22: warning: comparison of integer expressions of different signedness: 'dts::ll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |         for (ll i=0;i<tr[now].s.size();i++)
      |                     ~^~~~~~~~~~~~~~~~~
foo.cc: In function 'void dts::tr_dfs2(dts::ll)':
foo.cc:41:22: warning: comparison of integer expressions of different signedness: 'dts::ll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         for (ll i=0;i<tr[now].s.size();i++)
      |                     ~^~~~~~~~~~~~~~~~~
foo.cc: In function 'void dts::main()':
foo.cc:53:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   53 |         scanf("%lld",&n);
      |         ~~~~~^~~~~~~~~~~
foo.cc:55:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   55 |             scanf("%lld",&num[i]);
      |             ~~~~~^~~~~~~~~~~~~~~~
foo.cc:61:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   61 |             scanf("%lld%lld%lld",&x,&y,&c);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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