2016/advent2.c

   1 #define _GNU_SOURCE 1
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include <stdbool.h>
   7
   8 int main(void)
   9 {
  10   int key = '5';
  11   printf ("code is ");
  12   int c;
  13   while ((c = getchar ()) >= 0) {
  14     key = key >= 'A' ? key - 'A' + 9 : key - '1';
  15     switch (c) {
  16     case 'U':
  17       key = key["121452349678B"];
  18       break;
  19     case 'R':
  20       key = key["134467899BCCD"];
  21       break;
  22     case 'D':
  23       key = key["36785ABC9ADCD"];
  24       break;
  25     case 'L':
  26       key = key["122355678AABD"];
  27       break;
  28     case '\n':
  29       putchar (key = key["123456789ABCD"]);
  30     }
  31   }
  32   printf ("\n");
  33   return 0;
  34 }