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#advent of code 2018
#day 05
#part 1 and 2
#extremely slow, rewrite candidate
def polymer_d(a,b):
return (cdiff == abs(ord(a) - ord(b)));
def polymer_strip(inp):
is_poly = True;
while is_poly:
is_poly = False;
for x in range(1,len(inp)):
x1 = inp[x-1];
x2 = inp[x];
if polymer_d(x1,x2):
#print((x1+x2));
inp = inp.replace((x1+x2),"");
#myinput = myinput[
is_poly = True;
break;
return inp;
#part1
def PolymerReaction(myinput):
is_poly = True;
while is_poly:
is_poly = False;
sub = "";
for x in range(2,len(myinput)):
x1 = myinput[x-2];
x2 = myinput[x-1];
if polymer_d(x1,x2):
myinput = sub + myinput[x:];
is_poly = True;
break;
else:
sub += x1;
return len(myinput);
#part 2
def ShortestPolymer(myinput):
inp_max = 999999;
inp_c = "";
for c in range(ord("A"),ord("Z")+1,1):
subinput = myinput;
subinput = subinput.replace(chr(c),"");
subinput = subinput.replace(chr(c+cdiff),"");
subinput = polymer_strip(subinput);
if (len(subinput) < inp_max):
inp_max = len(subinput);
inp_c = c;
return inp_max
f = open("05.in","r");
cdiff = 32;
PuzzleInput = f.read().replace("\n","");
f.close();
p1 = PolymerReaction(""+PuzzleInput);
print("part 1", p1);
p2 = ShortestPolymer(""+PuzzleInput);
print("part 2 ",p2);
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