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20a.py
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20a.py
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import re
#p=<1609,-863,-779>, v=<-15,54,-69>, a=<-10,0,14>
REGEX = re.compile(r"p=<([-,0-9]+)>, v=<([-,0-9]+)>, a=<([-,0-9]+)>")
def parse(input):
result = []
p_no = 0
for item in input:
match = REGEX.match(item.strip())
if match != None:
position = map(int, match.group(1).split(","))
velocity = map(int, match.group(2).split(","))
acceleration = map(int, match.group(3).split(","))
result.append([position, velocity, acceleration, p_no, True])
else:
raise Exception("parse " + item)
p_no += 1
return result
fh = open("20.txt")
input = [s.strip() for s in fh.readlines()]
fh.close()
particles = parse(input)
cycle=0
while True:
for i1, p1 in enumerate(particles):
for i2, p2 in enumerate(particles[i1+1:]):
if p1[0] == p2[0]:
p1[4] = False
p2[4] = False
a = len(particles)
particles = filter(lambda p: p[4], particles)
b = len(particles)
if a > b:
print "collisions:", a, "->", b
for p in particles:
position = p[0]
velocity = p[1]
acceleration = p[2]
number = p[3]
for i in range(0,3):
velocity[i] += acceleration[i]
p[1] = velocity
for i in range(0,3):
position[i] += velocity[i]
p[0] = position
cycle+=1
if cycle>20000: break
print cycle
particles.sort(key=lambda x: x[0])
for p in particles[0:10]: print p