Compilare: user.cpp: In function ‘int r()’: user.cpp:91:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<st.size(); j++) ^ user.cpp: In function ‘int d()’: user.cpp:101:14: warning: variable ‘p’ set but not used [-Wunused-but-set-variable] int n=0, p=1; ^ user.cpp: In function ‘int main()’: user.cpp:140:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i< s.size(); i++) ^ user.cpp:159:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<s.size(); i++) ^