Compilare: user.cpp: In function ‘void read(int&)’: user.cpp:38:58: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, sizeof(char), DIM, stdin), pos = 0; ^ user.cpp:43:57: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,sizeof(char), DIM, stdin), pos = 0; ^ user.cpp: In function ‘int main()’: user.cpp:127:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gminmax.in","rt",stdin); ^ user.cpp:128:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gminmax.out","wt",stdout); ^