Compilare: main.cpp: In function 'void precalc_hash()': main.cpp:32:26: 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] 32 | for(int j = 1; j <= s[i].size(); j++) | ~~^~~~~~~~~~~~~~ main.cpp:24:9: warning: unused variable 's0' [-Wunused-variable] 24 | int s0 = s[0].size(), s1 = s[1].size(); | ^~