結果

問題 No.1103 Directed Length Sum
ユーザー McGregorshMcGregorsh
提出日時 2022-07-10 13:55:54
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 1,972 ms / 3,000 ms
コード長 2,021 bytes
コンパイル時間 814 ms
コンパイル使用メモリ 81,792 KB
実行使用メモリ 234,176 KB
最終ジャッジ日時 2025-01-03 01:41:23
合計ジャッジ時間 20,866 ms
ジャッジサーバーID
(参考情報)
judge3 / judge1
このコードへのチャレンジ
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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 157 ms
89,856 KB
testcase_01 AC 152 ms
90,112 KB
testcase_02 AC 970 ms
222,208 KB
testcase_03 AC 849 ms
234,176 KB
testcase_04 AC 1,136 ms
147,620 KB
testcase_05 AC 1,972 ms
189,952 KB
testcase_06 AC 751 ms
127,616 KB
testcase_07 AC 289 ms
97,792 KB
testcase_08 AC 378 ms
103,520 KB
testcase_09 AC 242 ms
94,848 KB
testcase_10 AC 441 ms
108,544 KB
testcase_11 AC 1,217 ms
153,344 KB
testcase_12 AC 761 ms
128,128 KB
testcase_13 AC 445 ms
109,312 KB
testcase_14 AC 231 ms
93,696 KB
testcase_15 AC 615 ms
119,040 KB
testcase_16 AC 1,413 ms
159,828 KB
testcase_17 AC 1,427 ms
162,560 KB
testcase_18 AC 431 ms
108,544 KB
testcase_19 AC 1,286 ms
153,852 KB
testcase_20 AC 265 ms
96,896 KB
testcase_21 AC 347 ms
101,504 KB
testcase_22 AC 1,059 ms
143,744 KB
testcase_23 AC 650 ms
121,856 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

import sys, re
from fractions import Fraction
from math import ceil, floor, sqrt, pi, factorial, gcd
from copy import deepcopy
from collections import Counter, deque, defaultdict
from heapq import heapify, heappop, heappush
from itertools import accumulate, product, combinations, combinations_with_replacement, permutations
from bisect import bisect, bisect_left, bisect_right
from functools import reduce
from decimal import Decimal, getcontext
def i_input(): return int(input())
def i_map(): return map(int, input().split())
def i_list(): return list(i_map())
def i_row(N): return [i_input() for _ in range(N)]
def i_row_list(N): return [i_list() for _ in range(N)]
def s_input(): return input()
def s_map(): return input().split()
def s_list(): return list(s_map())
def s_row(N): return [s_input for _ in range(N)]
def s_row_str(N): return [s_list() for _ in range(N)]
def s_row_list(N): return [list(s_input()) for _ in range(N)]
def lcm(a, b): return a * b // gcd(a, b)
def get_distance(x1, y1, x2, y2):
	  d = sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)
	  return d
def rotate(table):
   	  n_fild = []
   	  for x in zip(*table[::-1]):
   	  	  n_fild.append(x)
   	  return n_fild
sys.setrecursionlimit(10 ** 7)
INF = float('inf')
MOD = 10 ** 9 + 7
MOD2 = 998244353

count = 0
###関数コピーしたか?###
def main():
   
   n = int(input())
   
   nums = [[] for i in range(n)]
   hen = [0] * n
   for i in range(n-1):
   	  a, b = i_map()
   	  a -= 1
   	  b -= 1
   	  nums[a].append(b)
   	  hen[b] += 1
   
   for i in range(n):
   	  if hen[i] == 0:
   	  	  root = i
   	  	  break
   
   
   score = [INF] * n
   score[root] = 0
   que = deque()
   que.append(root)
   
   while que:
   	  num = que.popleft()
   	  for i in nums[num]:
   	  	  if score[i] == INF:
   	  	  	  score[i] = score[num] + 1
   	  	  	  que.append(i)
   
   ans = 0
   for i in range(n):
   	  point = score[i]
   	  ans += point * (point+1) // 2
   	  ans %= MOD
   print(ans)
   
   
if __name__ == '__main__':
    main()


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