https://adventofcode.com/2023/day/15

day15.py

def chsh(s):
    hsh = 0
    for c in s:
        hsh += ord(c)
        hsh *= 17
        hsh %= 256
    return hsh


hshsum = 0
bx = [dict() for _ in range(256)]
for s in input().split(','):
    hshsum += chsh(s)  # part 1
    match s.split('='):
        case [l, f]:
            bx[chsh(l)][l] = int(f)
        case [l]:
            bx[chsh(l[:-1])].pop(l[:-1], 0)

print(hshsum)
print(sum(i*j*b[h] for i, b in enumerate(bx, 1) for j, h in enumerate(b, 1)))