Compilare: main.cpp: In function 'int main()': main.cpp:57:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for ( int i = 0; i < sum[0].size(); i++ ) { | ~~^~~~~~~~~~~~~~~ main.cpp:64:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if ( j != sum[1].size() ) | ~~^~~~~~~~~~~~~~~~