Compilare: user.cpp: In function ‘int main()’: user.cpp:21:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<=t.size();i++){ ^ user.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=s.size();i++){ ^ user.cpp:33:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q==t.size()){ ^