結果
問題 | No.898 tri-βutree |
ユーザー | 👑 rin204 |
提出日時 | 2022-04-17 16:28:09 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 1,240 ms / 4,000 ms |
コード長 | 2,439 bytes |
コンパイル時間 | 188 ms |
コンパイル使用メモリ | 82,176 KB |
実行使用メモリ | 128,768 KB |
最終ジャッジ日時 | 2024-06-07 23:12:10 |
合計ジャッジ時間 | 21,610 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 508 ms
128,768 KB |
testcase_01 | AC | 37 ms
52,864 KB |
testcase_02 | AC | 47 ms
62,080 KB |
testcase_03 | AC | 48 ms
60,544 KB |
testcase_04 | AC | 47 ms
60,928 KB |
testcase_05 | AC | 47 ms
60,800 KB |
testcase_06 | AC | 47 ms
61,056 KB |
testcase_07 | AC | 1,088 ms
125,460 KB |
testcase_08 | AC | 1,057 ms
125,808 KB |
testcase_09 | AC | 1,124 ms
125,676 KB |
testcase_10 | AC | 1,110 ms
125,756 KB |
testcase_11 | AC | 1,091 ms
125,512 KB |
testcase_12 | AC | 1,133 ms
125,352 KB |
testcase_13 | AC | 1,075 ms
126,552 KB |
testcase_14 | AC | 1,162 ms
126,168 KB |
testcase_15 | AC | 1,068 ms
125,392 KB |
testcase_16 | AC | 1,110 ms
126,032 KB |
testcase_17 | AC | 1,089 ms
125,272 KB |
testcase_18 | AC | 1,081 ms
125,292 KB |
testcase_19 | AC | 1,195 ms
126,104 KB |
testcase_20 | AC | 1,240 ms
125,136 KB |
testcase_21 | AC | 1,113 ms
125,388 KB |
ソースコード
class WeightedLCA: def __init__(self, n, edges, e, ope, root = 0): self.n = n self.e = e self.ope = ope self.logn = (n - 1).bit_length() self.root = root self.depth = [-1] * self.n self.parent = [[-1] * n for _ in range(self.logn)] self.weight = [[-1] * n for _ in range(self.logn)] self.dfs(edges) self.doubling() def dfs(self, edges): stack = [self.root] self.depth[self.root] = 0 while stack: pos = stack.pop() for npos, w in edges[pos]: if self.depth[npos] != -1: continue self.depth[npos] = self.depth[pos] + 1 self.parent[0][npos] = pos self.weight[0][npos] = w stack.append(npos) def doubling(self): for i in range(1, self.logn): for j in range(self.n): if self.parent[i - 1][j] != -1: p = self.parent[i - 1][j] self.parent[i][j] = self.parent[i - 1][p] self.weight[i][j] = self.ope(self.weight[i - 1][j], self.weight[i - 1][p]) def get(self, u, v): if self.depth[v] < self.depth[u]: u, v = v, u du = self.depth[u] dv = self.depth[v] ret = self.e for i in range(self.logn): if (dv - du) >> i & 1: ret = self.ope(ret, self.weight[i][v]) v = self.parent[i][v] if u == v: return ret, u for i in range(self.logn - 1, -1, -1): pu = self.parent[i][u] pv = self.parent[i][v] if pu != pv: ret = self.ope(ret, self.weight[i][u]) ret = self.ope(ret, self.weight[i][v]) u, v = pu, pv ret = self.ope(ret, self.weight[0][u]) ret = self.ope(ret, self.weight[0][v]) u = self.parent[0][u] return ret, u n = int(input()) edges = [[] for _ in range(n)] for _ in range(n - 1): u, v, w = map(int, input().split()) edges[u].append((v, w)) edges[v].append((u, w)) lca = WeightedLCA(n, edges, 0, lambda x, y: x + y) Q = int(input()) for _ in range(Q): x, y, z = map(int, input().split()) ans = lca.get(x, y)[0] ans += lca.get(y, z)[0] ans += lca.get(z, x)[0] print(ans // 2)