Compilare: main.cpp: In function 'int main()': main.cpp:64:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for (i = 0; i < l && i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:69:12: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | for (; i < s.size(); i++) { | ~~^~~~~~~~~~