list union python
set1 = {2, 4, 5, 6}
set2 = {4, 6, 7, 8}
set3 = {7, 8, 9, 10}
# union of two sets
print("set1 U set2 : ", set1.union(set2))
# union of three sets
print("set1 U set2 U set3 :", set1.union(set2, set3))
>>>
set1 U set2 : {2, 4, 5, 6, 7, 8}
set1 U set2 U set3 : {2, 4, 5, 6, 7, 8, 9, 10}python union find
class DisjointSet:
def __init__(self, n):
self.data = list(range(n))
self.size = n
def find(self, index):
return self.data[index]
def union(self, x, y):
x, y = self.find(x), self.find(y)
if x == y:
return
for i in range(self.size):
if self.find(i) == y:
self.data[i] = x
@property
def length(self):
return len(set(self.data))
disjoint = DisjointSet(10)
disjoint.union(0, 1)
disjoint.union(1, 2)
disjoint.union(2, 3)
disjoint.union(4, 5)
disjoint.union(5, 6)
disjoint.union(6, 7)
disjoint.union(8, 9)
print(disjoint.data)
print(disjoint.length)
# [0, 0, 0, 0, 4, 4, 4, 4, 8, 8]
# 3Copyright © 2021 Codeinu
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