結果
| 問題 |
No.748 yuki国のお財布事情
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-01-05 09:18:14 |
| 言語 | Python3 (3.13.1 + numpy 2.2.1 + scipy 1.14.1) |
| 結果 |
AC
|
| 実行時間 | 1,878 ms / 2,000 ms |
| コード長 | 2,245 bytes |
| コンパイル時間 | 83 ms |
| コンパイル使用メモリ | 12,928 KB |
| 実行使用メモリ | 108,800 KB |
| 最終ジャッジ日時 | 2024-10-15 16:07:01 |
| 合計ジャッジ時間 | 6,971 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
| 外部呼び出し有り |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 26 |
ソースコード
import sys
from collections import defaultdict
from scipy.sparse.csgraph import minimum_spanning_tree
from scipy.sparse import csr_matrix
input = sys.stdin.buffer.readline
MAX = 10 ** 10
class UnionFind:
def __init__(self, n):
self.n = n
self.parent = [i for i in range(n)]
self.height = [1] * n
self.size = [1] * n
def find(self, x):
if self.parent[x] == x:
return x
else:
self.parent[x] = self.find(self.parent[x])
return self.parent[x]
def unite(self, x, y):
x = self.find(x)
y = self.find(y)
if x != y:
if self.height[x] < self.height[y]:
self.parent[x] = y
self.size[y] += self.size[x]
else:
self.parent[y] = x
self.size[x] += self.size[y]
if self.height[x] == self.height[y]:
self.height[x] += 1
def issame(self, x, y):
return self.find(x) == self.find(y)
def group_size(self, x):
return self.size[self.find(x)]
def group_members(self, x):
root = self.find(x)
return [i for i in range(self.n) if self.find(i) == root]
def roots(self):
return [i for i, x in enumerate(self.parent) if i == x]
def group_count(self):
return len(self.roots())
N, M, K = map(int, input().split())
ABC = []
for _ in range(M):
a, b, c = map(int, input().split())
a -= 1
b -= 1
ABC.append([a, b, c])
cost = 0
uf = UnionFind(N)
for _ in range(K):
e = int(input()) - 1
a, b, c = ABC[e]
uf.unite(a, b)
cost += c
compress_dict = {x: i for i, x in enumerate(uf.roots())}
compress_N = uf.group_count()
d = defaultdict(lambda: MAX)
for a, b, c in ABC:
a, b = uf.find(a), uf.find(b)
if a == b:
continue
a, b = compress_dict[a], compress_dict[b]
if a > b: a, b = b, a
d[(a, b)] = min(d[(a, b)], c)
length, frm, to = [], [], []
for (a, b), c in d.items():
length.append(c)
frm.append(a)
to.append(b)
matr = csr_matrix((length, (frm, to)), shape=(compress_N, compress_N))
T = minimum_spanning_tree(matr)
cost += int(T.sum())
ans = sum(c for _, _, c in ABC) - cost
print(ans)