blob: 0fac67238f860fec536725c17ac3b128fe39c8e6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
import fileinput
class SetJoin:
def __init__(self, n):
self._parent = [i for i in range(n)]
def rep(self, i):
return i if self._parent[i] == i else self.rep(self._parent[i])
def join(self, i, j):
self._parent[self.rep(i)] = self.rep(j)
with fileinput.input() as lines:
pts = [tuple(int(x) for x in line[:-1].split(',')) for line in lines]
def dist(p, q):
return (p[0]-q[0])**2 + (p[1]-q[1])**2 + (p[2]-q[2])**2
r = range(len(pts))
d = sorted([(dist(pts[i], pts[j]), i, j) for i in r for j in r if j > i])
sj = SetJoin(len(pts))
for _, j, k in d:
if sj.rep(j) != sj.rep(k):
sj.join(j, k)
sol = pts[j][0] * pts[k][0]
print(sol)
|
