#include <cstring>
+static const char DI = '1';
+static const char DIT = '1';
+static const char DA = '2';
+static const char DAH = '2';
+static const char END = '0';
+
static const char alphabet[26][4] = {
{ DI, DAH, END, END }, /* A */
{ DA, DI, DI, DIT }, /* B */