Compilare: user.cpp: In function ‘void cit(int&)’: user.cpp:39:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(lin, 1, Dim, stdin), poz = 0; ^ user.cpp:45:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(lin, 1, Dim, stdin), poz = 0; ^ user.cpp: In function ‘int main()’: user.cpp:112:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("timetravel.in", "rb", stdin); ^ user.cpp:113:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("timetravel.out", "wb", stdout); ^