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59 changes: 59 additions & 0 deletions graphs/krushkals_algorithm.py
Original file line number Diff line number Diff line change
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def find_parent(parent, node):
if parent[node] == node:
return node

parent[node] = find_parent(parent, parent[node])
return parent[node]


def union_set(u, v, parent, rank):
u = find_parent(parent, u)
v = find_parent(parent, v)

if rank[u] < rank[v]:
parent[u] = v
else:
parent[v] = u
if rank[u] == rank[v]:
rank[u] += 1


def make_set(n):
parent = list(range(n))
rank = [0] * n
return parent, rank


def minimum_spanning_tree(edges, n):
parent, rank = make_set(n)
edges.sort(key=lambda x: x[2])

min_wt = 0

for u, v, w in edges:
u_parent = find_parent(parent, u)
v_parent = find_parent(parent, v)

if u_parent != v_parent:
min_wt += w
union_set(u_parent, v_parent, parent, rank)

return min_wt


def main():
n = int(input("Enter the number of nodes: "))
m = int(input("Enter the number of edges: "))

edges = []
for _ in range(m):
u, v, w = map(int, input().split())
edges.append([u, v, w])

min_weight = minimum_spanning_tree(edges, n)

print(f"Weight of Kruskal's MST : {min_weight}")


if __name__ == "__main__":
main()