mathdatech/Python
1
0
Fork 0
mirror of https://github.com/TheAlgorithms/Python.git synced 2024-11-27 23:11:09 +00:00
Code Issues Packages Projects Releases Wiki Activity

add minimum spanning tree kruskal

Browse Source
This commit is contained in:
Thanapat Katapornsiri 2017-10-27 14:16:26 +07:00
parent ad935df161
commit e07e0cb38b
1 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
Graphs/minimum_spanning_tree_kruskal.py Normal file
View File

@ -0,0 +1,31 @@
num_nodes, num_edges = list(map(int,input().split()))
edges = []
for i in range(num_edges):
node1, node2, cost = list(map(int,input().split()))
edges.append((i,node1,node2,cost))
edges = sorted(edges, key=lambda edge: edge[3])
parent = [i for i in range(num_nodes)]
def find_parent(i):
if(i != parent[i]):
parent[i] = find_parent(parent[i])
return parent[i]
minimum_spanning_tree_cost = 0
minimum_spanning_tree = []
for edge in edges:
parent_a = find_parent(edge[1])
parent_b = find_parent(edge[2])
if(parent_a != parent_b):
minimum_spanning_tree_cost += edge[3]
minimum_spanning_tree.append(edge)
parent[parent_a] = parent_b
print(minimum_spanning_tree_cost)
for edge in minimum_spanning_tree:
print(edge)