Compilare: user.cpp: In function ‘int main()’: user.cpp:21:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<divi.size();++i) ^ user.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i;j<divi.size();++j) ^ user.cpp:12:37: 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:13:39: 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); ^