https://adventofcode.com/2023/leaderboard/day/18 finally top 100

day18.py

x, y, A, L, P2 = 0, 0, 0, 0, True
for d, s, c in map(str.split, open(0)):
    s = int(c[2:-2], 16) if P2 else int(s)
    if P2: d = "RDLU"[int(c[-2])]
    nx, ny = x, y
    if d=='R':
        ny += s
    elif d=='L':
        ny -= s
    elif d=='U':
        nx -= s
    elif d=='D':
        nx += s
    A += nx*y-x*ny
    L += s
    x, y = nx, ny
print(L+A//2-L//2+1)