Compilare: user.cpp: In function ‘int main()’: user.cpp:29:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < divb.size(); ++i) ^ user.cpp:30:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < divb.size(); ++j) { ^ user.cpp:10:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.in", "r", stdin); ^ user.cpp:11:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.out", "w", stdout); ^