Compilare: user.cpp: In function ‘var _solve(var)’: user.cpp:48:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(var j=0; j<Factors.size(); j++) { ^ user.cpp: In function ‘int main()’: user.cpp:88:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gcd2.in", "r", stdin); ^ user.cpp:89:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gcd2.out", "w", stdout); ^