Compilare: main.cpp: In function 'void precalc_hashuri(const std::string&)': main.cpp:21:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for( i = 1; i <= s.size(); i ++ ) { | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': 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( i = 0; i < a.size(); i ++ ) { | ~~^~~~~~~~~~ main.cpp:51:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for( i = 0; i < b.size() - A + 1; i ++ ) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:53:11: warning: unused variable 'x' [-Wunused-variable] 53 | int x = ((hashA * powP) % mod); | ^