Compilare: main.cpp: In function 'int main()': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < A.size(); i++) ~~^~~~~~~~~~ main.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < B.size(); i++) ~~^~~~~~~~~~ main.cpp:40:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (w == A.size() - 1) ~~^~~~~~~~~~~~~~~