Compilare: main.cpp:3: warning: ignoring '#pragma optimization_level ' [-Wunknown-pragmas] 3 | #pragma optimization_level 3 | main.cpp:8: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas] 8 | #pragma GCC optimization ("unroll-loops") | main.cpp: In function 'bool check(std::string)': main.cpp:44:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp: In function 'void addCuv(std::string)': main.cpp:61:19: 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=0; i<s.size(); i++) | ~^~~~~~~~~