Compilare: main.cpp: In function 'void solve()': main.cpp:32:31: 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 i=1; i<aa.size(); i++) | ~^~~~~~~~~~ main.cpp:35:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int i=0; i<aa.size(); i++) | ~^~~~~~~~~~ main.cpp:61:31: 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=1; i<bb.size(); i++) | ~^~~~~~~~~~ main.cpp:64:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for(int i=0; i<bb.size(); i++) | ~^~~~~~~~~~