Compilare: main.cpp: In function 'int main()': main.cpp:45:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for(int i = 0;i < s.size();++i) | ~~^~~~~~~~~~ main.cpp:54:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for(int i = 0;i < s.size();++i) | ~~^~~~~~~~~~ main.cpp:63:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for(int i = 0;i < r.size();++i) | ~~^~~~~~~~~~