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Day14.py
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Day14.py
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import networkx as nx
from Utils import read_input_as_list
from collections import defaultdict
def extract_element(element_tuple):
element_tuple = element_tuple.strip()
quantity = int(element_tuple.split(" ")[0])
element = element_tuple.split(" ")[1]
return (element, quantity)
def construct_graph():
global g
lines = read_input_as_list("inputs/14.txt")
for line in lines:
lh_elements = [extract_element(ele_tuple) for ele_tuple in line.split("=>")[0].split(",")]
rh_element = [extract_element(ele_tuple) for ele_tuple in line.split("=>")[1].split(",")][0]
if rh_element not in g.nodes:
g.add_node(rh_element, name=rh_element)
for lh_element in lh_elements:
if lh_element not in g.nodes:
g.add_node(lh_element, name=lh_element)
g.add_edge(rh_element[0], lh_element[0], l_val=lh_element[1], r_val=rh_element[1])
def get_resources(node_name, node_quant):
global g, res_dict, surplus
answer = node_quant
for d in g.out_edges(node_name):
u,v = d
r_quant = g.edges[d]['r_val']
l_quant = g.edges[d]['l_val']
factor = -(-node_quant // r_quant) # Ceil division
answer = factor * r_quant
res_quant = get_resources(v, l_quant*factor - surplus[v])
surplus[v] = res_quant - (l_quant*factor - surplus[v])
res_dict[v] = res_dict[v] + res_quant if v in res_dict else res_quant
return answer
g = nx.DiGraph()
res_dict = {}
surplus = defaultdict(int)
construct_graph()
# Part 1
res_dict = {}
surplus = defaultdict(int)
answer = get_resources('FUEL', 1)
print("Part 1")
print(res_dict['ORE'])
# Part 2
low = 0
high = 1000000000000
while low < high:
mid = (low + high) // 2
res_dict = {}
surplus = defaultdict(int)
answer = get_resources('FUEL', mid)
if res_dict['ORE'] > 1000000000000:
high = mid - 1
elif res_dict['ORE'] < 1000000000000:
low = mid + 1
print("Part 2")
print(low-1)