Compilare: main.cpp: In function 'int main()': main.cpp:34:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for (int i = 0; i < num.size(); i++) | ~~^~~~~~~~~~~~ main.cpp:61:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | for (int i = 0; i < num1.size(); i++) | ~~^~~~~~~~~~~~~ main.cpp:70:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for (int i = 0; i < num2.size(); i++) | ~~^~~~~~~~~~~~~ main.cpp:99:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for (int i = 0; i < num1.size(); i++) | ~~^~~~~~~~~~~~~ main.cpp:108:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 108 | for (int i = 0; i < num2.size(); i++) | ~~^~~~~~~~~~~~~