Compilare: main.cpp: In function 'void evaluate(long long int, long long int, long long int)': main.cpp:22:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<s.size()){ ~~~^~~~~~~~~ main.cpp: In function 'long long int get(long long int&, std::__cxx11::string&)': main.cpp:32:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<s.size()&&'0'<=s[ind]&&s[ind]<='9'){ ~~~^~~~~~~~~ main.cpp:39:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<s.size()&&'0'<=s[ind]&&s[ind]<='9'){ ~~~^~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:57:8: warning: unused variable 'ind' [-Wunused-variable] int ind=0; ^~~