結果
| 問題 | No.3013 ハチマキ買い星人 |
| コンテスト | |
| ユーザー |
まぬお
|
| 提出日時 | 2025-02-01 18:28:57 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 1,155 ms / 2,000 ms |
| コード長 | 1,738 bytes |
| コンパイル時間 | 265 ms |
| コンパイル使用メモリ | 82,488 KB |
| 実行使用メモリ | 123,488 KB |
| 最終ジャッジ日時 | 2025-02-01 18:29:25 |
| 合計ジャッジ時間 | 27,554 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 1 |
| other | AC * 45 |
ソースコード
from collections import deque, defaultdict, Counter
from bisect import bisect_left, bisect_right
from itertools import permutations, combinations
from heapq import heappop, heappush
import math
_int = lambda x: int(x)-1
MOD = 998244353
INF = 1<<60
Yes, No = "Yes", "No"
from heapq import heappop, heappush
class Dijkstra:
def __init__(self, n = 0):
self._INF = 1<<60
self._n = n
self._E = [[] for _ in range(self._n)]
self.init_data()
def init_data(self):
self._cost = [self._INF]*self._n
self._vis = [0]*self._n
self._bf = [-1]*self._n
def add_edge(self, u, v, c, directed = False):
self._E[u].append((c, v))
if directed == False:
self._E[v].append((c, u))
def calc(self, start):
self.init_data()
self._cost[start] = 0
q = [(0, start)]
while q:
cost, i = heappop(q)
if self._vis[i]: continue
self._vis[i] = 1
for c, j in self._E[i]:
if self._vis[j]: continue
if self._cost[j] < cost+c: continue
self._cost[j] = cost+c
self._bf[j] = i
heappush(q, (cost+c, j))
def vis(self):
return self._vis
def cost(self):
return self._cost
def before(self):
return self._bf
N, M, P, Y = map(int, input().split())
D = Dijkstra(N)
for _ in range(M):
a, b, c = map(int, input().split())
D.add_edge(a-1, b-1, c)
D.calc(0)
vis = D.vis()
cost = D.cost()
ans = 0
for _ in range(P):
d, e = map(int, input().split())
d = d-1
if vis[d] == 0: continue
x = Y-cost[d]
num = x//e
ans = max(ans, num)
print(ans)
まぬお