foo.cc: In function 'void dts::main()':
foo.cc:49:41: 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]
   49 |                 for (ll i=stk.back().i;i<e[stk.back().x].size();i++,stk.back().i=i)
      |                                        ~^~~~~~~~~~~~~~~~~~~~~~~
foo.cc:67:33: 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]
   67 |                 if (stk.back().i>=e[stk.back().x].size())
      |                     ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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