Compilare: main.cpp: In function 'int main()': main.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < A.size(); i++) ~~^~~~~~~~~~ main.cpp:36:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < B.size(); i++) ~~^~~~~~~~~~ main.cpp:44:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == A.size()) ~~^~~~~~~~~~~