Compilare: user.cpp: In function ‘int value(int)’: user.cpp:72:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<fix.size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:107:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<fix.size(); ++i) ^ user.cpp:109:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<fre.size(); ++j) ^ user.cpp:123:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<fre.size(); ++i, ok = 1-ok) ^