Compilare: main.cpp:9:5: warning: built-in function 'pow' declared as non-function [-Wbuiltin-declaration-mismatch] 9 | int pow[2'000'005]; | ^~~ main.cpp: In function 'int main()': main.cpp:25:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int i = 1; i < s.size(); i ++) { | ~~^~~~~~~~~~ main.cpp:30:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i = 0; i < a.size(); i ++) { | ~~^~~~~~~~~~ main.cpp:33:43: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for(int st = 0, dr = a.size() - 1; dr < s.size(); st ++, dr ++) { | ~~~^~~~~~~~~~