Compilare: user.cpp: In function ‘void read(int&)’: user.cpp:8:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==bufs) { fread(buf, 1, bufs, stdin); pos = 0; } } ^ user.cpp:22:5: note: in expansion of macro ‘nxt’ nxt(); ^ user.cpp:8:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==bufs) { fread(buf, 1, bufs, stdin); pos = 0; } } ^ user.cpp:23:45: note: in expansion of macro ‘nxt’ while(buf[pos] < '0' || buf[pos] > '9') nxt(); ^ user.cpp:8:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==bufs) { fread(buf, 1, bufs, stdin); pos = 0; } } ^ user.cpp:24:77: note: in expansion of macro ‘nxt’ while(buf[pos] >= '0' && buf[pos] <= '9') {a = a * 10 + buf[pos] - '0'; nxt(); } ^ user.cpp: In function ‘int main()’: user.cpp:30:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("morcovi.in", "r", stdin); ^ user.cpp:31:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("morcovi.out", "w", stdout); ^