Compilare: main.cpp: In function 'std::pair<char, int> solve3()': main.cpp:80:1: warning: no return statement in function returning non-void [-Wreturn-type] 80 | } | ^ main.cpp: In function 'int main()': main.cpp:106:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | for (int i = 0; i < s.size(); i++) | ~~^~~~~~~~~~