Compilare: main.cpp: In function 'void get_int(int&)': main.cpp:18:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer , sz , 1 , stdin); ^ main.cpp:26:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer , sz , 1 , stdin); ^ main.cpp: In function 'int main()': main.cpp:123:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biscuiti.in" , "r" , stdin); ^ main.cpp:124:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biscuiti.out" , "w" , stdout); ^