Compilare: main.cpp: In function 'int main()': main.cpp:34:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for (i=0; i<s2.size(); i++) | ~^~~~~~~~~~ main.cpp:37:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for (k=i; k<s2.size(); k++) | ~^~~~~~~~~~ main.cpp:53:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for (i=0; i<s2.size(); i++) | ~^~~~~~~~~~ main.cpp:56:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for (k=i; k<s2.size(); k++) | ~^~~~~~~~~~ main.cpp:68:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for (i=0; i<lastas2.size(); i++) | ~^~~~~~~~~~~~~~~ main.cpp:71:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for (k=i; k<lastas2.size(); k++) | ~^~~~~~~~~~~~~~~