Compilare: main.cpp: In function 'int main()': main.cpp:30:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=a.size()+1;i<b.size();++i) ~^~~~~~~~~ main.cpp:31:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i]==a.size())