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day2-part1-Intcode-calendar

a guest Dec 3rd, 2019 69 Never
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  1. $opcodes = [1,12,2,3,1,1,2,3,1,3,4,3,1,5,0,3,2,9,1,19,1,19,6,23,2,6,23,27,2,27,9,31,1,5,31,35,1,35,10,39,2,39,9,43,1,5,43,47,2,47,10,51,1,51,6,55,1,5,55,59,2,6,59,63,2,63,6,67,1,5,67,71,1,71,9,75,2,75,10,79,1,79,5,83,1,10,83,87,1,5,87,91,2,13,91,95,1,95,10,99,2,99,13,103,1,103,5,107,1,107,13,111,2,111,9,115,1,6,115,119,2,119,6,123,1,123,6,127,1,127,9,131,1,6,131,135,1,135,2,139,1,139,10,0,99,2,0,14,0];
  2.  
  3. $i = 0;
  4.  
  5. do {
  6.   $opcode = $opcodes[$i];
  7.  
  8.   switch ($opcode) {
  9.       case 1:
  10.         // add
  11.      
  12.         $pos1 = $opcodes[$i + 1];
  13.         $pos2 = $opcodes[$i + 2];
  14.         $pos3 = $opcodes[$i + 3];
  15.         $opcodes[$pos3] = $opcodes[$pos1] + $opcodes[$pos2];
  16.      
  17.         break;
  18.       case 2:
  19.         // multiply
  20.        
  21.         $pos1 = $opcodes[$i + 1];
  22.         $pos2 = $opcodes[$i + 2];
  23.         $pos3 = $opcodes[$i + 3];
  24.         $opcodes[$pos3] = $opcodes[$pos1] * $opcodes[$pos2];
  25.        
  26.         break;
  27.   }
  28.  
  29.   $i += 4;
  30.  
  31. } while ($opcode != 99);
  32.  
  33. echo $opcodes[0];
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