結果

問題 No.386 貪欲な領主
ユーザー qibqib
提出日時 2022-10-15 20:05:43
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 744 ms / 2,000 ms
コード長 1,304 bytes
コンパイル時間 216 ms
コンパイル使用メモリ 82,476 KB
実行使用メモリ 109,336 KB
最終ジャッジ日時 2024-06-26 20:16:30
合計ジャッジ時間 5,945 ms
ジャッジサーバーID
(参考情報)
judge1 / judge5
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ファイルパターン 結果
other AC * 16
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

from collections import deque
n = int(input())
g = [[] for _ in range(n)]
for _ in range(n - 1):
a, b = map(int, input().split())
g[a].append(b)
g[b].append(a)
u = [int(input()) for _ in range(n)]
src = 0
depth = [None for _ in range(n)]
depth[src] = 0
dq = deque()
dq.appendleft(src)
k = n.bit_length()
doub = [[None for _ in range(n)] for _ in range(k)]
doub[0][src] = src
cost = [0 for _ in range(n)]
cost[src] = u[src]
while len(dq) > 0:
cur = dq.pop()
for nxt in g[cur]:
if not depth[nxt] is None:
continue
depth[nxt] = depth[cur] + 1
cost[nxt] = cost[cur] + u[nxt]
doub[0][nxt] = cur
dq.appendleft(nxt)
for i in range(1, k):
for v in range(n):
doub[i][v] = doub[i - 1][doub[i - 1][v]]
def lca(u, v):
ut = u
vt = v
if depth[ut] > depth[vt]:
ut, vt = vt, ut
diff = depth[vt] - depth[ut]
for i in range(k):
if (diff >> i) & 1 != 0:
vt = doub[i][vt]
if ut != vt:
for i in range(depth[ut].bit_length() - 1, -1, -1):
if doub[i][ut] != doub[i][vt]:
ut = doub[i][ut]
vt = doub[i][vt]
if ut != vt:
ut = doub[0][ut]
return ut
ans = 0
m = int(input())
for _ in range(m):
a, b, c = map(int, input().split())
l = lca(a, b)
ans += c * (cost[a] + cost[b] - 2 * cost[l] + u[l])
print(ans)
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