Compilare: user.cpp: In function ‘int main()’: user.cpp:92:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arb4.in", "r", stdin); ^ user.cpp:93:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arb4.out", "w", stdout); ^ user.cpp: In function ‘void Next()’: user.cpp:166:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (sir, 1, maxl, stdin), p = 0; ^