Submission #7490650
Source Code Expand
import sys sys.setrecursionlimit(10**8) def resolve(): import math class DoublingLCA: """ construct: O(NlogN) query O(logN) """ def __init__(self,edges,root=0): """ :param list of (list of int) edges: :param int root=0: """ self.edges = edges self.n = len(edges) self.root = root self.MAX_LOG_V = self.n.bit_length() self.depths = [-1] * self.n self.parents = [[-1] * self.n for _ in range(self.MAX_LOG_V)] self.__dfs(-1,root,0) self.__doubling() def __dfs(self,par,cur,dep): self.depths[cur]=dep self.parents[0][cur]=par for v in self.edges[cur]: if v!=par: self.__dfs(cur,v,dep+1) def __doubling(self): for k in range(self.MAX_LOG_V - 1): for v in range(self.n): if self.parents[k][v] < 0: # 親がない continue self.parents[k+1][v]=self.parents[k][self.parents[k][v]] def get(self, u, v): # 深さを合わせる dd=self.depths[v]-self.depths[u] if dd<0: u, v = v, u dd*=-1 for k in range(self.MAX_LOG_V): if dd&(1<<k): v = self.parents[k][v] if v == u: return v # にぶたん for k in reversed(range(self.MAX_LOG_V)): if self.parents[k][u] != self.parents[k][v]: u = self.parents[k][u] v = self.parents[k][v] return self.parents[0][u] N = int(input()) XY = [list(map(int, input().split())) for _ in range(N - 1)] Q = int(input()) AB = [list(map(int, input().split())) for _ in range(Q)] edges = [[] for _ in range(N + 1)] for x, y in XY: edges[x - 1].append(y - 1) edges[y - 1].append(x - 1) lca = DoublingLCA(edges=edges) for u,v in AB: u=u-1 v=v-1 print(lca.depths[u]+lca.depths[v]-2*lca.depths[lca.get(u,v)]+1) resolve()
Submission Info
Submission Time | |
---|---|
Task | D - 閉路 |
User | moni0627 |
Language | PyPy3 (2.4.0) |
Score | 100 |
Code Size | 2306 Byte |
Status | AC |
Exec Time | 1618 ms |
Memory | 203736 KB |
Judge Result
Set Name | Sample | Subtask1 | Subtask2 | ||||||
---|---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 30 / 30 | 70 / 70 | ||||||
Status |
|
|
|
Set Name | Test Cases |
---|---|
Sample | subtask0_sample01.txt, subtask0_sample02.txt, subtask0_sample03.txt |
Subtask1 | subtask1_01.txt, subtask1_02.txt, subtask1_03.txt, subtask1_04.txt, subtask1_05.txt, subtask1_06.txt, subtask1_07.txt, subtask1_08.txt, subtask1_09.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt |
Subtask2 | subtask0_sample01.txt, subtask0_sample02.txt, subtask0_sample03.txt, subtask1_01.txt, subtask1_02.txt, subtask1_03.txt, subtask1_04.txt, subtask1_05.txt, subtask1_06.txt, subtask1_07.txt, subtask1_08.txt, subtask1_09.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt, subtask2_01.txt, subtask2_02.txt, subtask2_03.txt, subtask2_04.txt, subtask2_05.txt, subtask2_06.txt, subtask2_07.txt, subtask2_08.txt, subtask2_09.txt, subtask2_10.txt, subtask2_11.txt, subtask2_12.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
subtask0_sample01.txt | AC | 173 ms | 38256 KB |
subtask0_sample02.txt | AC | 173 ms | 38256 KB |
subtask0_sample03.txt | AC | 177 ms | 38256 KB |
subtask1_01.txt | AC | 1029 ms | 176728 KB |
subtask1_02.txt | AC | 1039 ms | 176152 KB |
subtask1_03.txt | AC | 173 ms | 38256 KB |
subtask1_04.txt | AC | 179 ms | 38256 KB |
subtask1_05.txt | AC | 230 ms | 41712 KB |
subtask1_06.txt | AC | 218 ms | 40560 KB |
subtask1_07.txt | AC | 739 ms | 90712 KB |
subtask1_08.txt | AC | 801 ms | 96600 KB |
subtask1_09.txt | AC | 835 ms | 102360 KB |
subtask1_10.txt | AC | 883 ms | 98392 KB |
subtask1_11.txt | AC | 837 ms | 108804 KB |
subtask1_12.txt | AC | 816 ms | 105048 KB |
subtask2_01.txt | AC | 1520 ms | 203608 KB |
subtask2_02.txt | AC | 1501 ms | 203736 KB |
subtask2_03.txt | AC | 754 ms | 78424 KB |
subtask2_04.txt | AC | 753 ms | 78040 KB |
subtask2_05.txt | AC | 836 ms | 82648 KB |
subtask2_06.txt | AC | 826 ms | 82116 KB |
subtask2_07.txt | AC | 1590 ms | 127704 KB |
subtask2_08.txt | AC | 1564 ms | 126424 KB |
subtask2_09.txt | AC | 1618 ms | 121816 KB |
subtask2_10.txt | AC | 1556 ms | 122328 KB |
subtask2_11.txt | AC | 1546 ms | 120848 KB |
subtask2_12.txt | AC | 1550 ms | 121304 KB |