結果

問題 No.2712 Play more!
ユーザー hiro1729hiro1729
提出日時 2024-03-31 14:47:09
言語 PyPy3
(7.3.15)
結果
WA  
実行時間 -
コード長 2,514 bytes
コンパイル時間 157 ms
コンパイル使用メモリ 82,248 KB
実行使用メモリ 80,888 KB
最終ジャッジ日時 2024-09-30 19:56:52
合計ジャッジ時間 7,274 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
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 62 ms
68,660 KB
testcase_01 AC 62 ms
68,064 KB
testcase_02 AC 59 ms
68,276 KB
testcase_03 AC 61 ms
69,660 KB
testcase_04 WA -
testcase_05 AC 67 ms
68,060 KB
testcase_06 AC 63 ms
69,056 KB
testcase_07 AC 332 ms
79,888 KB
testcase_08 AC 296 ms
80,280 KB
testcase_09 AC 278 ms
80,252 KB
testcase_10 WA -
testcase_11 AC 183 ms
79,384 KB
testcase_12 AC 274 ms
79,876 KB
testcase_13 AC 173 ms
79,684 KB
testcase_14 AC 218 ms
79,596 KB
testcase_15 AC 488 ms
79,932 KB
testcase_16 AC 144 ms
79,100 KB
testcase_17 AC 106 ms
78,360 KB
testcase_18 AC 133 ms
78,828 KB
testcase_19 AC 118 ms
78,548 KB
testcase_20 AC 198 ms
79,536 KB
testcase_21 AC 165 ms
79,788 KB
testcase_22 AC 312 ms
79,744 KB
testcase_23 AC 114 ms
78,384 KB
testcase_24 AC 157 ms
79,352 KB
testcase_25 AC 106 ms
78,256 KB
testcase_26 AC 140 ms
79,344 KB
testcase_27 AC 125 ms
79,788 KB
testcase_28 AC 138 ms
78,392 KB
testcase_29 AC 145 ms
79,736 KB
testcase_30 AC 309 ms
80,200 KB
testcase_31 AC 406 ms
80,888 KB
testcase_32 AC 322 ms
79,492 KB
testcase_33 AC 72 ms
73,076 KB
testcase_34 AC 61 ms
68,876 KB
testcase_35 AC 60 ms
69,084 KB
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ソースコード

diff #

import typing


class DSU:
    '''
    Implement (union by size) + (path halving)

    Reference:
    Zvi Galil and Giuseppe F. Italiano,
    Data structures and algorithms for disjoint set union problems
    '''

    def __init__(self, n: int = 0) -> None:
        self._n = n
        self.parent_or_size = [-1] * n

    def merge(self, a: int, b: int) -> int:
        assert 0 <= a < self._n
        assert 0 <= b < self._n

        x = self.leader(a)
        y = self.leader(b)

        if x == y:
            return x

        if -self.parent_or_size[x] < -self.parent_or_size[y]:
            x, y = y, x

        self.parent_or_size[x] += self.parent_or_size[y]
        self.parent_or_size[y] = x

        return x

    def same(self, a: int, b: int) -> bool:
        assert 0 <= a < self._n
        assert 0 <= b < self._n

        return self.leader(a) == self.leader(b)

    def leader(self, a: int) -> int:
        assert 0 <= a < self._n

        parent = self.parent_or_size[a]
        while parent >= 0:
            if self.parent_or_size[parent] < 0:
                return parent
            self.parent_or_size[a], a, parent = (
                self.parent_or_size[parent],
                self.parent_or_size[parent],
                self.parent_or_size[self.parent_or_size[parent]]
            )

        return a

    def size(self, a: int) -> int:
        assert 0 <= a < self._n

        return -self.parent_or_size[self.leader(a)]

    def groups(self) -> typing.List[typing.List[int]]:
        leader_buf = [self.leader(i) for i in range(self._n)]

        result: typing.List[typing.List[int]] = [[] for _ in range(self._n)]
        for i in range(self._n):
            result[leader_buf[i]].append(i)

        return list(filter(lambda r: r, result))
from heapq import *
N, M = map(int, input().split())
A = list(map(int, input().split()))
g = []
uf = DSU(N)
for _ in range(M):
	a, b, c = map(int, input().split())
	a -= 1
	b -= 1
	g.append((a, b, c))
	uf.merge(a, b)
s = []
for i in range(N):
	if uf.same(0, i):
		s.append(i)
ok = set(s)
es = []
for i, j, c in g:
	if i in ok and j in ok:
		es.append((i, j, c))

inf = 10 ** 20

dist = [-inf] * N
dist[0] = 0
for i in range(N + 1):
	for u, v, c in es:
		if dist[u] != -inf and dist[v] < dist[u] + A[v] - c:
			dist[v] = dist[u] + A[v] - c
for u, v, c in es:
	if uf.same(0, u) and uf.same(N - 1, u) and dist[u] != -inf and dist[v] < dist[u] + A[v] - c:
		exit(print("inf"))
print(max(0, dist[N - 1] + A[0]) if dist[N - 1] > -inf else "inf")
0