foo.cc:124:5: error: 'split' function uses 'auto' type specifier without trailing return type
  124 |     auto split(int pos)
      |     ^~~~
foo.cc:124:5: note: deduced return type only available with '-std=c++14' or '-std=gnu++14'
foo.cc:230:86: error: parameter declared 'auto'
  230 | template < typename T, typename T_lazy, T default_val, T_lazy default_lazy_val, auto op,
      |                                                                                      ^~
foo.cc:231:17: error: parameter declared 'auto'
  231 |            auto updval, auto lazydown
      |                 ^~~~~~
foo.cc:231:30: error: parameter declared 'auto'
  231 |            auto updval, auto lazydown
      |                              ^~~~~~~~
foo.cc:308:32: error: lambda-expression in template-argument only available with '-std=c++2a' or '-std=gnu++2a'
  308 | typedef Segtree< ll, ll, 0, 0, [](ll a, ll b) { return a + b; }, default_updval_func,
      |                                ^
foo.cc:309:40: error: template argument 5 is invalid
  309 |                  default_lazydown_func >
      |                                        ^
foo.cc:309:40: note: invalid template non-type parameter
foo.cc:309:40: note: invalid template non-type parameter
foo.cc:311:40: error: lambda-expression in template-argument only available with '-std=c++2a' or '-std=gnu++2a'
  311 | typedef Segtree< ll, ll, ( ll )1e9, 0, [](ll a, ll b) { return min(a, b); },
      |                                        ^
foo.cc:312:18: error: lambda-expression in template-argument only available with '-std=c++2a' or '-std=gnu++2a'
  312 |                  [](segnode< ll, ll >& now) { now.val += now.lazy; }, default_lazydown_func >
      |                  ^
foo.cc:312:93: error: template argument 5 is invalid
  312 |                  [](segnode< ll, ll >& now) { now.val += now.lazy; }, default_lazydown_func >
      |                                                                                             ^
foo.cc:312:93: error: template argument 6 is invalid
foo.cc:312:93: note: invalid template non-type parameter
foo.cc: In member function 'void str::AC_automaton::insert(std::string)':
foo.cc:326:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  326 |         for (int i = 0; i < s.length(); i++) {
      |                         ~~^~~~~~~~~~~~
foo.cc: In member function 'int str::AC_automaton::query(std::string)':
foo.cc:352:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  352 |         for (int i = 0; i < s.length(); i++) {
      |                         ~~^~~~~~~~~~~~

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