Compilare: main.cpp: In member function 'void Bigint::print()': main.cpp:107:16: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'int' [-Wsign-compare] 107 | if(sign==-1) putchar('-'); | ~~~~^~~~ main.cpp: In function 'std::ostream& operator<<(std::ostream&, Bigint&)': main.cpp:114:18: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'int' [-Wsign-compare] 114 | if(x.sign==-1) putchar('-'); | ~~~~~~^~~~