Compilare: user.cpp: In function ‘int main()’: user.cpp:91:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ^ user.cpp:95:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<expresie.size();i++) ^ user.cpp:120:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ^ user.cpp:131:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<expresie.size();j++) ^