Compilare: user.cpp: In function ‘int main()’: user.cpp:14:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<t.size();i++){ ^ user.cpp:22:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++){ ^ user.cpp:25:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q==t.size()){ ^