結果

問題 No.2427 Tree Distance Two
ユーザー mono_0812mono_0812
提出日時 2023-08-18 21:39:59
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 731 ms / 2,000 ms
コード長 3,222 bytes
コンパイル時間 662 ms
コンパイル使用メモリ 81,920 KB
実行使用メモリ 144,512 KB
最終ジャッジ日時 2024-11-28 06:13:06
合計ジャッジ時間 16,039 ms
ジャッジサーバーID
(参考情報)
judge2 / judge4
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ファイルパターン 結果
other AC * 35
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ソースコード

diff #
プレゼンテーションモードにする

############################################################################################
import bisect,collections,copy,heapq,itertools,math,string,sys,queue,time,random
from decimal import Decimal
def I(): return input()
def IS(): return input().split()
def II(): return int(input())
def IIS(): return list(map(int,input().split()))
def LIIS(): return list(map(int,input().split()))
def make_divisors(n):
lower_divisors , upper_divisors = [], []
i = 1
while i*i <= n:
if n % i == 0:
lower_divisors.append(i)
if i != n // i:
upper_divisors.append(n//i)
i += 1
return lower_divisors + upper_divisors[::-1]
import math
def prime_numbers(n):
prime = [True for i in range(n+1)]
prime[0] = False
prime[1] = False
sqrt_n = math.ceil(math.sqrt(n))
for i in range(2, sqrt_n):
if prime[i]:
for j in range(2*i, n+1, i):
prime[j] = False
numbers=[]
for i in range(2,n+1):
if prime[i]:
numbers.append(i)
return numbers
def factorization(n):
arr = []
temp = n
for i in range(2, int(-(-n**0.5//1))+1):
if temp%i==0:
cnt=0
while temp%i==0:
cnt+=1
temp //= i
arr.append([i, cnt])
if temp!=1:
arr.append([temp, 1])
if arr==[] and n>1:
arr.append([n, 1])
return arr
from collections import defaultdict
class UnionFind():
def __init__(self, n):
self.n = n
self.parents = [-1] * n
def find(self, x):
if self.parents[x] < 0:
return x
else:
self.parents[x] = self.find(self.parents[x])
return self.parents[x]
def union(self, x, y):
x = self.find(x)
y = self.find(y)
if x == y:
return
if self.parents[x] > self.parents[y]:
x, y = y, x
self.parents[x] += self.parents[y]
self.parents[y] = x
def size(self, x):
return -self.parents[self.find(x)]
def same(self, x, y):
return self.find(x) == self.find(y)
def members(self, x):
root = self.find(x)
return [i for i in range(self.n) if self.find(i) == root]
def roots(self):
return [i for i, x in enumerate(self.parents) if x < 0]
def group_count(self):
return len(self.roots())
def all_group_members(self):
group_members = defaultdict(list)
for member in range(self.n):
group_members[self.find(member)].append(member)
return group_members
def __str__(self):
return '\n'.join(f'{r}: {m}' for r, m in self.all_group_members().items())
INF=10**18
MOD=998244353
MOD2=10**9+7
sys.setrecursionlimit(500005)
def bit_count(x):
return bin(x).count("1")
def yesno(f):
if f:print("Yes")
else:print("No")
dxy=((1,0),(0,-1),(-1,0),(0,1))
##################################################################
n=II()
path=[[] for i in range(n)]
for i in range(n-1):
u,v=IIS()
path[u-1].append(v-1)
path[v-1].append(u-1)
for i in range(n):
res=0
for j in path[i]:
res+=len(path[j])-1
print(res)
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