Compilare: main.cpp: In function 'int main()': main.cpp:26:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for (int i = 1; i < pow_M1.size(); ++i) { | ~~^~~~~~~~~~~~~~~ main.cpp:42:23: 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 (int i = 0; i < s.size(); ++i) { | ~~^~~~~~~~~~ main.cpp:49:38: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 49 | for (int i = 0; i - 1 + s.size() < size; ++i) { | ~~~~~~~~~~~~~~~~~^~~~~~