Compilare: main.cpp: In function 'int main()': main.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();++i) ~^~~~~~~~~ main.cpp:21:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<a.size();++i) ~^~~~~~~~~ main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<v.size()) ~~~^~~~~~~~~