aoc

import sys

data = sys.argv[1] if len(sys.argv) > 1 else "day13data.txt"
didP1 = False
G = {}

for line in open(data):
    line = line.strip()
    if line and line.startswith("fold"):
        G2 = {}
        instr = line.split()[-1]
        d, v = instr.split("=")
        v = int(v)
        if d == "x":
            for x, y in G:
                if x < v:
                    G2[(x, y)] = True
                else:
                    G2[(v - (x - v), y)] = True
        else:
            assert d == "y"
            for x, y in G:
                if y < v:
                    G2[(x, y)] = True
                else:
                    G2[(x, v - (y - v))] = True
        G = G2
        if not didP1:
            didP1 = True
            print(len(G2))
    elif line:
        x, y = [int(v) for v in line.strip().split(",")]
        G[(x, y)] = True

X = max([x for x, y in G.keys()])
Y = max([y for x, y in G.keys()])

ans = ""
for y in range(Y + 1):
    for x in range(X + 1):
        ans += "x" if (x, y) in G else " "
    print(ans)
    ans = ""