Compilare: main.cpp: In function 'int main()': main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <a.size(); i++) ~~^~~~~~~~~ main.cpp:65:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ii < x.size() && j < y.size()) { ~~~^~~~~~~~~~ main.cpp:65:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ii < x.size() && j < y.size()) { ~~^~~~~~~~~~