Compilare: main.cpp: In function 'int main()': main.cpp:83:18: 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] 83 | for(i=0;i<buff.size();i++){ | ~^~~~~~~~~~~~ main.cpp:90:22: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] 90 | nr=nr*10+(buff[i]-'0'); | ~~^~~