Compilare: user.cpp: In function ‘int getNumber()’: user.cpp:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (l < s.length() && s[l]<'0' && s[l]>'9') ++l; ^ user.cpp:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (l < s.length() && s[l] >= '0' && s[l] <= '9') { rez = rez * 10 + s[l] - 48; ++l; } ^ user.cpp: In function ‘int main()’: user.cpp:230:9: warning: unused variable ‘nr2’ [-Wunused-variable] int nr2 = getupA(mid); ^ user.cpp:268:10: warning: unused variable ‘nr2’ [-Wunused-variable] int nr2 = getupB(mid); ^ user.cpp:224:9: warning: variable ‘found’ set but not used [-Wunused-but-set-variable] bool found = false; ^