Compilare: main.cpp: In function 'int main()': main.cpp:18:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i=1; i<sir.size(); ++i) { | ~^~~~~~~~~~~ main.cpp:21:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(r=i; r < sir.size() && sir[r] == sir[r-i]; ++r); | ~~^~~~~~~~~~~~ main.cpp:28:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(r=i; r < sir.size() && sir[r] == sir[r-i]; ++r); | ~~^~~~~~~~~~~~ main.cpp:35:28: 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=dimModel+1; i<sir.size(); ++i) { | ~^~~~~~~~~~~ main.cpp:39:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for(int i=dimModel+1; i<sir.size(); ++i) { | ~^~~~~~~~~~~