Compilare: user.cpp: In function ‘int main()’: user.cpp:40:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ciclu.size () - 1; i++) ^ user.cpp:30:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "ciclueuler.in", "rt", stdin); ^ user.cpp:31:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "ciclueuler.out", "wt", stdout); ^