Compilare: user.cpp: In function ‘int main()’: user.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=a.size();i++) cuv[i]=a[i-1]; ^ user.cpp:25:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=b.size();i++) sir[i]=b[i-1]; ^