Day13_adventcodeModel.md

• create class name 'cart'

Cart attribute
  int dx:
  int dy: 
  int state;
  int x,y; track coordinate on matrix
  /*
   if state == 1: turn left.(dx = -1)
   if state == 2: turn straight(dy = 1)
   if state == 3: turn right(dx = 1)
  */

1. read input. store in matrix(150x150)

• matrix representation
  • \/-| = '1'
  • + = '2' arbitary
  • ' '(blank) = '0'
  • if see '<|>|v|^|'
    • then create a object Cart. at that coor

2. So now we have.

• one matrix of the map.
• an Array list of 'Cart' object.

3. main Algorithm

• Iterate through array list of object. update the coordinate of each object base on 'dx' and 'dy' attribute of each. by lookingat the map matrix
  • if object coor hit position with '2'(intersection) then update 'stage' attribute
• If 2 object have same coordinate then exit return that coor