Compilare: main.cpp: In function 'std::string add(std::string, std::string)': main.cpp:10:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | if(i>=s2.size()-s1.size()){ | ~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int k=0;k<color[j].size();k++){ | ~^~~~~~~~~~~~~~~~