Compilare: main.cpp: In function 'void rez1()': main.cpp:17:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i(0);i<s.size();i++){ | ~^~~~~~~~~ main.cpp:23:22: 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(int i = 0; i < s.size() - 1; i++) { | ~~^~~~~~~~~~~~~~ main.cpp: In function 'bool check(std::string)': main.cpp:38:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(int i(1);i<s.size()-1;i++){ | ~^~~~~~~~~~~ main.cpp: In function 'void rez2()': main.cpp:55:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for(int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~