Algorithm/boj

[파이썬] 1197 최소 스패닝 트리

takeU 2022. 5. 9. 16:23
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v, e = map(int, input().split())
parent = [0] * (v+1)
for i in range(1, v+1):
    parent[i] = i

def find_parent(parent, x):
    if parent[x] != x:
        parent[x] = find_parent(parent, parent[x])
    return parent[x]

def union_parent(parent, a, b):
    a = find_parent(parent, a)
    b = find_parent(parent, b)
    if a < b:
        parent[b] = a
    else:
        parent[a] = b

edges = []
total_cost = 0

for _ in range(e):
    a, b, cost = map(int, input().split())
    edges.append((cost, a, b))

edges.sort()

for i in range(e):
    cost, a, b = edges[i]
    if find_parent(parent, a) != find_parent(parent, b):
        union_parent(parent, a, b)
        total_cost += cost

print(total_cost)

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