Compilare: main.cpp: In member function 'BigUint& BigUint::add(const BigUint&)': main.cpp:99:26: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 99 | if(nr.size() <= i) nr.push_back(0); | ~~~~~~~~~~^~~~ main.cpp:100:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 100 | if(i<oth.size()) nr[i] += oth[i] + r; | ~^~~~~~~~~~~ main.cpp: In member function 'BigUint& BigUint::substract(const BigUint&)': main.cpp:119:26: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare] 119 | if(nr.size() <= i) nr.push_back(0); | ~~~~~~~~~~^~~~ main.cpp:120:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 120 | if(i<oth.size()) nr[i] -= oth[i] + r; | ~^~~~~~~~~~~ main.cpp: In function 'BigUint multiply(const BigUint&, const BigUint&)': main.cpp:139:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 139 | for(int i=0; i<a.size(); ++i) | ~^~~~~~~~~ main.cpp:140:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 140 | for(int j=0; j<b.size(); ++j) | ~^~~~~~~~~ main.cpp:142:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 142 | for(int i=1; i<c.size(); ++i) | ~^~~~~~~~~ main.cpp: In member function 'void BigUint::fromString(std::string)': main.cpp:170:23: 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] 170 | for(int i=0; i<s.size()/BIG_BASE_EXP; ++i) | ^