Compilare: user.cpp: In function ‘int main()’: user.cpp:68:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secventa.out", "w", stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:16:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^ user.cpp: In function ‘int main()’: user.cpp:88:29: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d %d\n", dr - k + 1, dr, ans); ^