Compilare: main.cpp: In function 'std::unordered_set<long long unsigned int> hashes(const std::string&, int)': main.cpp:43:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 43 | if(s.length() < l) return ret; | ~~~~~~~~~~~^~~ main.cpp:55:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for(int i = l; i < s.length(); ++i) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:100:15: warning: iteration 49999 invokes undefined behavior [-Waggressive-loop-optimizations] 100 | pw[i] = (pw[i - 1] * base) % mod; | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:99:22: note: within this loop 99 | for(int i = 1; i <= 50000; ++i) { | ~~^~~~~~~~