Compilare: main.cpp: In function 'bool check(std::string, int)': main.cpp:16:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | if (pos + guess - 1 >= occ[b[i] - 'a'].size()) { | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:23: 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 (int i = 0; i < a.size(); i++) { | ~~^~~~~~~~~~