Compilare: main.cpp: In function 'int main()': main.cpp:21:17: 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( i = 0; i < s.size(); i++ ) { | ~~^~~~~~~~~~ main.cpp:28:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | while( r < s.size() && s[r] == s[r-l] ) | ~~^~~~~~~~~~ main.cpp:36:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | while( r < s.size() && s[r] == s[r-l] ) | ~~^~~~~~~~~~ main.cpp:42:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for( i = pattern.size(); i < s.size(); i++ ) { | ~~^~~~~~~~~~ main.cpp:43:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | if( z[i] == pattern.size() ) | ~~~~~^~~~~~~~~~~~~~~~~