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:23:19: 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 l(0);l<s.size();l++){ | ~^~~~~~~~~ main.cpp: In function 'bool check(std::string)': main.cpp:39:19: 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(1);i<s.size()-1;i++){ | ~^~~~~~~~~~~ main.cpp: In function 'void rez2()': main.cpp:61:23: 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()-1;i++){ | ~^~~~~~~~~~~