Compilare: main.cpp: In function 'int main()': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v1.size()-1;i++){ ~^~~~~~~~~~~~ main.cpp:48:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v2.size()-1;i++){ ~^~~~~~~~~~~~