Compilare: main.cpp: In function 'std::string pref(std::string, std::string)': main.cpp:35:22: 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 = 1; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp: In function 'bool continut(std::string, std::string)': main.cpp:61:22: 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 < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp:78:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for(int i = 0; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp:80:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 80 | if(pi[i] == a.size()) | ~~~~~~^~~~~~~~~~~