Compilare: main.cpp: In function 'nr combine(nr, nr)': main.cpp:21:23: 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] 21 | for(int i=0;i < aux.a.size(); i++) { | ~~^~~~~~~~~~~~~~ main.cpp:24:21: 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] 24 | if(i<a.a.size()) aux.a[i] += a.a[i]; | ~^~~~~~~~~~~ main.cpp:25:22: 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] 25 | if(i < b.a.size()) aux.a[i] += b.a[i]; | ~~^~~~~~~~~~~~ main.cpp: In function 'void mult(nr&, long long int)': main.cpp:42:23: 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] 42 | for(int i=0;i < a.a.size(); i++) { | ~~^~~~~~~~~~~~