Compilare: main.cpp: In function 'int main()': main.cpp:71:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < a.size() && p2 < b.size()) ~~~^~~~~~~~~~ main.cpp:71:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < a.size() && p2 < b.size()) ~~~^~~~~~~~~~