Advent of Code 2021 Python Solution: Day 14

from collections import Counter data,data1 = get_data(day=14) wdata=data1.copy() polymer = wdata[0] rule = {v[0]:v[1] for v in [d.split(" -> ") for d in wdata[2:]]} curr_polymer = polymer i=0 while i< 10: tpoly = curr_polymer # print(i, tpoly)  ind = 0 added = 0 for k, c in enumerate(tpoly): k+=1 ch = curr_polymer[k-1:k+1] mc = rule.get(ch) if mc: tpoly = [c for c in tpoly] tpoly.insert(k+added, mc) tpoly = "".join(tpoly) added+=1 curr_polymer = tpoly i+=1 res = dict(Counter(curr_polymer)) res = sorted(res.items(), key=lambda x: x[1], reverse=True) res[0][1]-res[-1][1] 

tmp_poly = Counter(a+b for a,b in zip(polymer, polymer[1:])) print(tmp_poly) chars = Counter(polymer) for _ in range(40): tmp = Counter() for (c1,c2),value in tmp_poly.items(): mc = rule[c1+c2] tmp[c1+mc] += value tmp[mc+c2] += value chars[mc] += value tmp_poly=tmp max(chars.values()) - min(chars.values())