Compilare: main.cpp: In function 'void next()': main.cpp:25:40: 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 , BUFF , stdin); ^ main.cpp: In function 'int main()': main.cpp:73:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("ciclueuler.in" , "r" , stdin); ^ main.cpp:74:36: 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 , BUFF , stdin); ^