Compilare: main.cpp: In function 'long long int calcul(long long int, long long int)': main.cpp:26:14: 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] 26 | while(poz<s.size()) | ~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:23: warning: unused variable 'k' [-Wunused-variable] 57 | long long n,q,i,j,k,a,b; | ^