Compilare: main.cpp: In function 'int calc(std::string&, std::string&, std::string&)': main.cpp:36:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for(int i = 0; i < s2.length(); i ++) | ~~^~~~~~~~~~~~~ main.cpp:46:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for(int i = maxx; i < s2.length(); i ++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:104:21: warning: unused variable 'pozi' [-Wunused-variable] 104 | int minn = 1e9, pozi, pozj, mask = (1 << n) - 1; | ^~~~ main.cpp:117:26: warning: 'pozj' may be used uninitialized [-Wmaybe-uninitialized] 117 | mask = mask ^ (1 << pozj); | ~~~^~~~~~~~ main.cpp:104:27: note: 'pozj' was declared here 104 | int minn = 1e9, pozi, pozj, mask = (1 << n) - 1; | ^~~~