prefix_elements
const int prefix_elements = (int)sizeof(prefix) / (int)sizeof(prefix[0]);
extern const int prefix_elements;
const int prefix_elements = (int)sizeof(prefix) / (int)sizeof(prefix[0]);
extern const int prefix_elements;
const int prefix_elements = (int)sizeof(prefix) / (int)sizeof(prefix[0]);
extern const int prefix_elements;
const int prefix_elements = (int)sizeof(prefix) / (int)sizeof(prefix[0]);
extern const int prefix_elements;