Compilare: main.cpp: In function 'int main()': main.cpp:18:17: 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( i = 0; i < a.size(); i++ ){ | ~~^~~~~~~~~~ main.cpp:23:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for( i = 1; i <= b.size() - a.size(); i++ ) | ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:26:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for( i = 0; i <= b.size() - a.size(); i++ ) | ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:31:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for( i = 0; i <= b.size() - a.size(); i++ ) | ~~^~~~~~~~~~~~~~~~~~~~~~