Compilare: main.cpp: In function 'void cit(int&)': main.cpp:32:37: 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,MAX,stdin); ^ main.cpp:40:37: 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,MAX,stdin); ^ main.cpp: In function 'int main()': main.cpp:144:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("tractomarm.in","r",stdin); ^ main.cpp:145:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("tractomarm.out","w",stdout); ^