Compilare: main.cpp: In function 'std::vector<long long int> multip(std::vector<long long int>, long long int)': main.cpp:24:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); i++){ ~^~~~~~~~~ main.cpp: In function 'std::vector<long long int> add(std::vector<long long int>, std::vector<long long int>)': main.cpp:38:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i>=a.size()){ ~^~~~~~~~~~ main.cpp:42:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i>=b.size()){ ~^~~~~~~~~~