Compilare: user.cpp: In function ‘int nextInt()’: user.cpp:12:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s[pos] == ' ' && pos < s.size()) ++pos; ^ user.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s.size() > pos && s[pos] != ' ') ^ user.cpp:19:7: warning: statement has no effect [-Wunused-value] Ret * 10; ^ user.cpp:15:6: warning: variable ‘sgn’ set but not used [-Wunused-but-set-variable] int sgn = 1; ^