Compilare: main.cpp: In function 'std::vector<std::vector<int> > submultimi(int)': main.cpp:36:9: warning: unused variable 'var' [-Wunused-variable] int var=1; ^~~ main.cpp: In function 'int main()': main.cpp:51:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size();i++){ ~^~~~~~~~~ main.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[i].size();j++){ ~^~~~~~~~~~~~