Compilare: main.cpp: In function 'void read()': main.cpp:109:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | for (int i = 0; i < a.size(); ++i) | ~~^~~~~~~~~~ main.cpp:113:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 113 | for (int i = 0; i < b.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:133:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 133 | for (int i = 0; i < a.size(); i++) | ~~^~~~~~~~~~