Compilare: user.cpp: In function ‘int main()’: user.cpp:11:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s2.size();i++) ^ user.cpp:14:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i;j<s1.size();j++) ^ user.cpp:22:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i!=s2.size()-1) ^