結果
| 問題 | No.1752 Up-Down Tree |
| ユーザー |
 vwxyz
|
| 提出日時 | 2023-05-25 06:03:08 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 563 ms / 2,000 ms |
| コード長 | 7,652 bytes |
| コンパイル時間 | 285 ms |
| コンパイル使用メモリ | 82,372 KB |
| 実行使用メモリ | 130,444 KB |
| 最終ジャッジ日時 | 2024-06-06 12:01:14 |
| 合計ジャッジ時間 | 9,660 ms |
|
ジャッジサーバーID （参考情報） |
judge3 / judge2 |
（要ログイン）
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 | 383 ms
124,596 KB |
| testcase_01 | AC | 371 ms
124,208 KB |
| testcase_02 | AC | 359 ms
130,420 KB |
| testcase_03 | AC | 377 ms
130,444 KB |
| testcase_04 | AC | 454 ms
124,464 KB |
| testcase_05 | AC | 452 ms
124,216 KB |
| testcase_06 | AC | 439 ms
124,592 KB |
| testcase_07 | AC | 448 ms
124,548 KB |
| testcase_08 | AC | 321 ms
107,704 KB |
| testcase_09 | AC | 469 ms
118,676 KB |
| testcase_10 | AC | 146 ms
89,216 KB |
| testcase_11 | AC | 144 ms
89,320 KB |
| testcase_12 | AC | 146 ms
88,960 KB |
| testcase_13 | AC | 398 ms
104,272 KB |
| testcase_14 | AC | 424 ms
105,360 KB |
| testcase_15 | AC | 299 ms
95,228 KB |
| testcase_16 | AC | 431 ms
105,472 KB |
| testcase_17 | AC | 395 ms
101,888 KB |
| testcase_18 | AC | 563 ms
119,056 KB |
| testcase_19 | AC | 557 ms
118,916 KB |
| testcase_20 | AC | 142 ms
88,960 KB |
| testcase_21 | AC | 143 ms
89,356 KB |
ソースコード
import bisect
import copy
import decimal
import fractions
import heapq
import itertools
import math
import random
import sys
import time
from collections import Counter,deque,defaultdict
from functools import lru_cache,reduce
from heapq import heappush,heappop,heapify,heappushpop,_heappop_max,_heapify_max
def _heappush_max(heap,item):
heap.append(item)
heapq._siftdown_max(heap, 0, len(heap)-1)
def _heappushpop_max(heap, item):
if heap and item < heap[0]:
item, heap[0] = heap[0], item
heapq._siftup_max(heap, 0)
return item
from math import gcd as GCD
read=sys.stdin.read
readline=sys.stdin.readline
readlines=sys.stdin.readlines
write=sys.stdout.write
class Graph:
def __init__(self,V,edges=None,graph=None,directed=False,weighted=False,inf=float("inf")):
self.V=V
self.directed=directed
self.weighted=weighted
self.inf=inf
if graph!=None:
self.graph=graph
self.edges=[]
for i in range(self.V):
if self.weighted:
for j,d in self.graph[i]:
if self.directed or not self.directed and i<=j:
self.edges.append((i,j,d))
else:
for j in self.graph[i]:
if self.directed or not self.directed and i<=j:
self.edges.append((i,j))
else:
self.edges=edges
self.graph=[[] for i in range(self.V)]
if weighted:
for i,j,d in self.edges:
self.graph[i].append((j,d))
if not self.directed:
self.graph[j].append((i,d))
else:
for i,j in self.edges:
self.graph[i].append(j)
if not self.directed:
self.graph[j].append(i)
def SIV_DFS(self,s,bipartite_graph=False,cycle_detection=False,directed_acyclic=False,euler_tour=False,linked_components=False,lowlink=False,parents=False,postorder=False,preorder=False,subtree_size=False,topological_sort=False,unweighted_dist=False,weighted_dist=False):
seen=[False]*self.V
finished=[False]*self.V
if directed_acyclic or cycle_detection or topological_sort:
dag=True
if euler_tour:
et=[]
if linked_components:
lc=[]
if lowlink:
order=[None]*self.V
ll=[None]*self.V
idx=0
if parents or cycle_detection or lowlink or subtree_size:
ps=[None]*self.V
if postorder or topological_sort:
post=[]
if preorder:
pre=[]
if subtree_size:
ss=[1]*self.V
if unweighted_dist or bipartite_graph:
uwd=[self.inf]*self.V
uwd[s]=0
if weighted_dist:
wd=[self.inf]*self.V
wd[s]=0
stack=[(s,0)] if self.weighted else [s]
while stack:
if self.weighted:
x,d=stack.pop()
else:
x=stack.pop()
if not seen[x]:
seen[x]=True
stack.append((x,d) if self.weighted else x)
if euler_tour:
et.append(x)
if linked_components:
lc.append(x)
if lowlink:
order[x]=idx
ll[x]=idx
idx+=1
if preorder:
pre.append(x)
for y in self.graph[x]:
if self.weighted:
y,d=y
if not seen[y]:
stack.append((y,d) if self.weighted else y)
if parents or cycle_detection or lowlink or subtree_size:
ps[y]=x
if unweighted_dist or bipartite_graph:
uwd[y]=uwd[x]+1
if weighted_dist:
wd[y]=wd[x]+d
elif not finished[y]:
if (directed_acyclic or cycle_detection or topological_sort) and dag:
dag=False
if cycle_detection:
cd=(y,x)
elif not finished[x]:
finished[x]=True
if euler_tour:
et.append(~x)
if lowlink:
bl=True
for y in self.graph[x]:
if self.weighted:
y,d=y
if ps[x]==y and bl:
bl=False
continue
ll[x]=min(ll[x],order[y])
if x!=s:
ll[ps[x]]=min(ll[ps[x]],ll[x])
if postorder or topological_sort:
post.append(x)
if subtree_size:
for y in self.graph[x]:
if self.weighted:
y,d=y
if y==ps[x]:
continue
ss[x]+=ss[y]
if bipartite_graph:
bg=[[],[]]
for tpl in self.edges:
x,y=tpl[:2] if self.weighted else tpl
if uwd[x]==self.inf or uwd[y]==self.inf:
continue
if not uwd[x]%2^uwd[y]%2:
bg=False
break
else:
for x in range(self.V):
if uwd[x]==self.inf:
continue
bg[uwd[x]%2].append(x)
retu=()
if bipartite_graph:
retu+=(bg,)
if cycle_detection:
if dag:
cd=[]
else:
y,x=cd
cd=self.Route_Restoration(y,x,ps)
retu+=(cd,)
if directed_acyclic:
retu+=(dag,)
if euler_tour:
retu+=(et,)
if linked_components:
retu+=(lc,)
if lowlink:
retu=(ll,)
if parents:
retu+=(ps,)
if postorder:
retu+=(post,)
if preorder:
retu+=(pre,)
if subtree_size:
retu+=(ss,)
if topological_sort:
if dag:
tp_sort=post[::-1]
else:
tp_sort=[]
retu+=(tp_sort,)
if unweighted_dist:
retu+=(uwd,)
if weighted_dist:
retu+=(wd,)
if len(retu)==1:
retu=retu[0]
return retu
N=int(readline())
edges=[]
for n in range(N-1):
A,B=map(int,readline().split())
A-=1;B-=1
edges.append((A,B))
G=Graph(N,edges=edges)
dp=[None]*N
parents,tour=G.SIV_DFS(0,parents=True,postorder=True)
for x in tour:
child=[y for y in G.graph[x] if y!=parents[x]]
if child:
ma=max(len(dp[y]) for y in child)
for y in child:
if len(dp[y])==ma:
dp[x]=dp[y]
break
for y in child:
if dp[x] is dp[y]:
continue
for c in dp[y]:
_heappush_max(dp[x],c)
if len(dp[x])>=2:
c0,c1=_heappop_max(dp[x]),_heappop_max(dp[x])
if c0%2 or c1%2:
_heappush_max(dp[x],c0+c1+1)
else:
_heappush_max(dp[x],c0+c1)
_heappush_max(dp[x],1)
else:
dp[x][0]+=1
else:
dp[x]=[1]
ans=dp[0][0]
print(ans)