結果
問題 | No.399 動的な領主 |
ユーザー | maspy |
提出日時 | 2020-04-22 17:20:37 |
言語 | Python3 (3.12.2 + numpy 1.26.4 + scipy 1.12.0) |
結果 |
AC
|
実行時間 | 1,592 ms / 2,000 ms |
コード長 | 2,820 bytes |
コンパイル時間 | 198 ms |
コンパイル使用メモリ | 13,056 KB |
実行使用メモリ | 72,096 KB |
最終ジャッジ日時 | 2024-10-11 20:50:30 |
合計ジャッジ時間 | 17,376 ms |
ジャッジサーバーID (参考情報) |
judge4 / 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 | 30 ms
11,008 KB |
testcase_01 | AC | 30 ms
11,008 KB |
testcase_02 | AC | 35 ms
11,008 KB |
testcase_03 | AC | 31 ms
11,136 KB |
testcase_04 | AC | 39 ms
11,392 KB |
testcase_05 | AC | 135 ms
16,248 KB |
testcase_06 | AC | 1,574 ms
70,904 KB |
testcase_07 | AC | 1,592 ms
70,228 KB |
testcase_08 | AC | 1,559 ms
70,732 KB |
testcase_09 | AC | 1,555 ms
68,872 KB |
testcase_10 | AC | 43 ms
11,520 KB |
testcase_11 | AC | 133 ms
16,424 KB |
testcase_12 | AC | 1,427 ms
66,844 KB |
testcase_13 | AC | 1,437 ms
66,504 KB |
testcase_14 | AC | 1,082 ms
66,692 KB |
testcase_15 | AC | 1,161 ms
71,476 KB |
testcase_16 | AC | 1,252 ms
72,096 KB |
testcase_17 | AC | 1,495 ms
66,880 KB |
testcase_18 | AC | 1,535 ms
68,836 KB |
ソースコード
import sys read = sys.stdin.buffer.read readline = sys.stdin.buffer.readline readlines = sys.stdin.buffer.readlines import itertools def EulerTour(graph, root=1): N = len(graph) - 1 parent = [0] * (N + 1) stack = [-root, root] tour = [] ind_L = [0] * (N + 1) ind_R = [0] * (N + 1) i = -1 while stack: v = stack.pop() tour.append(v) i += 1 if v > 0: ind_L[v] = i p = parent[v] for w in graph[v]: if w == p: continue parent[w] = v stack.append(-w) stack.append(w) else: ind_R[-v] = i return tour, ind_L, ind_R, parent class SegTree: """ segment tree with point modification and range product access. """ data_unit = None @classmethod def data_f(cls, x, y): if x is None: return y if y is None: return x if depth[x] > depth[y]: return y else: return x def __init__(self, N): self.N = N self.data = [self.data_unit] * (N + N) def build(self, raw_data): data = self.data f = self.data_f N = self.N data[N:] = raw_data[:] for i in range(N - 1, 0, -1): data[i] = f(data[i << 1], data[i << 1 | 1]) def set_val(self, i, x): data = self.data f = self.data_f i += self.N data[i] = x while i > 1: i >>= 1 data[i] = f(data[i << 1], data[i << 1 | 1]) def fold(self, L, R): """ compute for [L, R) """ vL = vR = self.data_unit data = self.data f = self.data_f L += self.N R += self.N while L < R: if L & 1: vL = f(vL, data[L]) L += 1 if R & 1: R -= 1 vR = f(data[R], vR) L >>= 1 R >>= 1 return f(vL, vR) N = int(readline()) graph = [[] for _ in range(N + 1)] for _ in range(N - 1): u, v = map(int, readline().split()) graph[u].append(v) graph[v].append(u) tour, ind_L, ind_R, parent = EulerTour(graph) depth = tuple(itertools.accumulate(1 if x > 0 else -1 for x in tour)) seg = SegTree(len(depth)) seg.build(range(len(depth))) imos = [0] * (N + 1) Q = int(readline()) m = map(int, read().split()) for a, b in zip(m, m): i, j = ind_L[a], ind_L[b] if i > j: i, j = j, i k = seg.fold(i, j + 1) lca = tour[k] if lca < 0: lca = parent[-lca] imos[a] += 1 imos[b] += 1 imos[lca] -= 1 imos[parent[lca]] -= 1 for v in tour[::-1]: if v > 0: imos[parent[v]] += imos[v] answer = sum(x * (x + 1) for x in imos) // 2 print(answer)