Compilare: main.cpp: In function 'std::vector<int> Inm(const std::vector<int>&, const std::vector<int>&)': main.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < A.size(); ++i ) ~~^~~~~~~~~~ main.cpp:21:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 1; j < B.size(); ++j ) ~~^~~~~~~~~~ main.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1; i < C.size(); ++i ) ~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> Sum(const std::vector<int>&, const std::vector<int>&)': main.cpp:65:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^