diff --git a/43-Number_of_Connected_Components_in_an_Undirected_Graph.py b/43-Number_of_Connected_Components_in_an_Undirected_Graph.py
new file mode 100644
index 000000000..9e2456ff5
--- /dev/null
+++ b/43-Number_of_Connected_Components_in_an_Undirected_Graph.py
@@ -0,0 +1,31 @@
+
+class Solution:
+ def count_components(self, n: int, edges: List[List[int]]) -> int:
+ parent = [i for i in range(n)]
+ rank = [1] * n
+
+ def find_union(node: int) -> None:
+ result = node
+ while result != parent[result]:
+ parent[result] = parent[parent[result]] # path compression
+ result = parent[result]
+ return result
+
+ def union(node_1: int, node_2: int):
+ parent_1 = find_union(node_1)
+ parent_2 = find_union(node_2)
+ if parent_1 == parent_2:
+ return 0
+ if rank[parent_2] < rank[parent_1]:
+ parent[parent_1] = parent_2
+ rank[parent_2] += rank[parent_1]
+ else:
+ parent[parent_2] = parent_1
+ rank[parent_1] += rank[parent_2]
+ return 1
+
+ result = n
+ for node_1, node_2 in edges:
+ result -= union(node_1, node_2)
+ return result
+
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