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#advent of code 2018
#day 13
#part 1 and part 2
#I got it working the first time, but I was getting a wrong answer for actual input
#turns out I made a mistake in calculations for the crossroads for turn-left and turn-right
#i hastily scrambled a set of 2 equations for X and Y coordinates
#and it costed me time wasted on debugging
#for each round I was drawing the current layout of the map with a single cart
#I noticed that at crossroads it was doing a turn-left, straight, turn-left
#(instead of right for 3rd crossroads)
#I followed my equations by *slowly* calculating them on paper
#and found out that I had wrong signs for Y coordinate
#fun puzzle nonetheless
#comment for part2
#i had a bit of an issue with getting it working properly
#at this moment, the part2 is calculated correctly, but part1 was off
#I cleaned up the code a bit and managed to solve this, so both parts are in the same file
f = open("input.txt",'r');
Testing = False;
#Testing = True;
if Testing:
f.close();
f = open("testinput.txt",'r');
class trackpoint:
def __init__(self, sign, x, y):
self.sign = sign;
self.positionX = x;
self.positionY = y;
def __str__(self):
return self.sign;
class hline(trackpoint):
def __init__(self, sign, x, y):
trackpoint.__init__(self, sign, x, y);
def GiveSteps(self, cart_x, cart_y, cartid):
#left or right
x_next = self.positionX + (self.positionX - cart_x);
y_next = self.positionY + (self.positionY - cart_y);
return [x_next, y_next];
class vline(trackpoint):
def __init__(self, sign, x, y):
trackpoint.__init__(self, sign, x, y);
def GiveSteps(self, cart_x, cart_y, cartid):
#up or down
x_next = self.positionX + (self.positionX - cart_x);
y_next = self.positionY + (self.positionY - cart_y);
return [x_next, y_next];
class turnleft(trackpoint):
def __init__(self, sign, x, y):
trackpoint.__init__(self, sign, x, y);
def GiveSteps(self, cart_x, cart_y, cartid):
x_next = self.positionX - (cart_y - self.positionY);
y_next = self.positionY - (cart_x - self.positionX);
return [x_next, y_next];
class turnright(trackpoint):
def __init__(self, sign, x, y):
trackpoint.__init__(self, sign, x, y);
def GiveSteps(self, cart_x, cart_y, cartid):
x_next = self.positionX + (cart_y - self.positionY);
y_next = self.positionY + (cart_x - self.positionX);
return [x_next, y_next];
class crossroads(trackpoint):
def __init__(self, sign, x, y):
trackpoint.__init__(self, sign, x, y);
self.CartRegistry = {};
def GiveSteps(self, cart_x, cart_y, cartid):
#number of crossroads is updated before this function is called, thats why it starts from 1
if (cartid%3 == 1):
#turn left
x_next = self.positionX - (cart_y - self.positionY);
y_next = self.positionY + (cart_x - self.positionX);
elif (cartid%3 == 2):
#go straight
x_next = self.positionX + (self.positionX - cart_x);
y_next = self.positionY + (self.positionY - cart_y);
elif (cartid%3 == 0):
#turn right
x_next = self.positionX + (cart_y - self.positionY);
y_next = self.positionY - (cart_x - self.positionX);
return [x_next, y_next];
class minecart:
def __init__(self, sign, x, y, cart_id):
self.posX = x;
self.posY = y;
self.XroadsEncountered = 0;
self.nextstepX = x;
self.nextstepY = y;
self.Cart_ID = cart_id;
self.notHit = True;
if (sign == '>'):
self.prevX = x-1;
self.prevY = y;
if (sign == '<'):
self.prevX = x+1;
self.prevY = y;
if (sign == 'v'):
self.prevX = x;
self.prevY = y-1;
if (sign == '^'):
self.prevX = x;
self.prevY = y+1;
def cartmove(self, nextX, nextY):
self.nextstepX = nextX;
self.nextstepY = nextY;
self.prevX = self.posX;
self.prevY = self.posY;
self.posX = self.nextstepX;
self.posY = self.nextstepY;
def ReadCoords(self):
return [self.posX, self.posY];
def CheckMatch(self, OtherCoords):
return (self.posX == OtherCoords[0] and self.posY == OtherCoords[1]);
def IsXroads(self, currentsign):
if (currentsign == "+"):
self.XroadsEncountered += 1;
trackmap = [];
for l in f:
subline = [];
l.replace("\n", "");
for c in l:
subline.append(c);
trackmap.append(subline.copy());
cartlist = [];
cartid_counter = 10;
TMSize_C = len(trackmap);
TMSize_R = len(trackmap[0]) -1;
#RETREIVING MINECARTS AND REPLACING SIGNS ON THE MAP
for c in range(TMSize_C):
for r in range(TMSize_R):
if (trackmap[c][r] == '^' or trackmap[c][r] == 'v' or trackmap[c][r] == '>' or trackmap[c][r] == '<'):
cartlist.append( minecart(trackmap[c][r], r, c, cartid_counter) );
cartid_counter += 1;
if (trackmap[c][r] == '^' or trackmap[c][r] == 'v'):
trackmap[c][r] = '|';
if (trackmap[c][r] == '>' or trackmap[c][r] == '<'):
trackmap[c][r] = '-';
cartlist = sorted(cartlist, key=lambda x: (x.posY, x.posX));
newmap = [];
for c in range(TMSize_C):
templine = [];
for r in range(TMSize_R):
if (trackmap[c][r] == ' '):
templine.append( trackpoint(trackmap[c][r], r, c) );
elif (trackmap[c][r] == '-'):
templine.append( hline(trackmap[c][r], r, c) );
elif (trackmap[c][r] == '|'):
templine.append( vline(trackmap[c][r], r, c) );
elif (trackmap[c][r] == '/'):
templine.append( turnright(trackmap[c][r], r, c) );
elif (trackmap[c][r] == '\\'):
templine.append( turnleft(trackmap[c][r], r, c) );
elif (trackmap[c][r] == '+'):
templine.append( crossroads(trackmap[c][r], r, c) );
newmap.append( templine.copy() );
roundcounter = 0;
part1 = None;
p1round = 0;
while (len(cartlist) > 1):
roundcounter += 1;
cartlist = sorted(cartlist, key=lambda x: (x.posY, x.posX));
for mc in cartlist:
NextSteps = [];
mc.IsXroads(newmap[mc.posY][mc.posX].sign);
NextSteps = newmap[mc.posY][mc.posX].GiveSteps(mc.prevX, mc.prevY, mc.XroadsEncountered);
mc.cartmove(NextSteps[0],NextSteps[1]);
MatchCounter = 0;
for mc2 in cartlist:
if mc.Cart_ID != mc2.Cart_ID:
mc.notHit = not mc.CheckMatch( mc2.ReadCoords() );
mc2.notHit = not mc2.CheckMatch( mc.ReadCoords() );
if part1 == None and mc.notHit == False:
part1 = mc.ReadCoords();
p1round = int(roundcounter);
#print("part 1 = ",part1, "\t after", roundcounter, "rounds");
cartlist = [c for c in cartlist if c.notHit];
part2 = cartlist[0].ReadCoords();
print("part 1 = ",part1, "\t after", p1round, "rounds");
print("part 2 = ",part2, "\t after", roundcounter, "rounds");
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