Compilare: user.cpp: In function ‘void findGoodPairing(int)’: user.cpp:30:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < v[i].size(); j++) ^ user.cpp:41:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < v[i].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:129:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < v[i].size(); j++) ^ user.cpp:162:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < v[i].size()) ^