Compilare: main.cpp: In function 'int main()': main.cpp:22:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for (int i=0; i<s.length(); i++) | ~^~~~~~~~~~~ main.cpp:46:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | if (a!=s.length()-1 && v[a+1]>v[a]+1) | ~^~~~~~~~~~~~~~