Compilare: user.cpp: In function ‘void pred()’: user.cpp:12:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size()-1;i++) ^ user.cpp:23:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=lst+2;i<s.size();i++) ^ user.cpp: In function ‘void succ()’: user.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size()-1;i++) ^ user.cpp:41:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(lst<s.size()-1) ^ user.cpp:43:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lst==s.size()-2) {g<<'1';lst++;} ^