Compilare: user.cpp: In function ‘int main()’: user.cpp:95:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("gossips.in", "r", stdin); ^ user.cpp:96:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("gossips.out", "w", stdout); ^ user.cpp: In function ‘char next()’: user.cpp:74:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF, stdin), pos = 0; ^