Compilare: main.cpp: In function 'int main()': main.cpp:32:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for (int j = 1; j <= s.size(); j++) { | ~~^~~~~~~~~~~ main.cpp:45:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for (int i = 0; i < v[0].size() ; i++) { | ~~^~~~~~~~~~~~~