Compilare: main.cpp: In function 'void compute_general()': main.cpp:66:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (int len = 1; len <= k.size(); len++) | ~~~~^~~~~~~~~~~ main.cpp: In function 'int get_ans()': main.cpp:92:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 92 | for (int len = 1; len <= k.size(); len++) { | ~~~~^~~~~~~~~~~ main.cpp:96:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 96 | skip_spec = (len < k.size() ? state{0, +1} : state{-1, -1}); | ~~~~^~~~~~~~~~