結果

問題 No.1494 LCS on Tree
ユーザー 草苺奶昔草苺奶昔
提出日時 2023-03-14 10:23:51
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 742 ms / 2,000 ms
コード長 3,483 bytes
コンパイル時間 292 ms
コンパイル使用メモリ 82,608 KB
実行使用メモリ 295,940 KB
最終ジャッジ日時 2024-04-30 17:53:24
合計ジャッジ時間 21,411 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge4
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 60 ms
69,156 KB
testcase_01 AC 61 ms
68,188 KB
testcase_02 AC 61 ms
68,244 KB
testcase_03 AC 611 ms
269,020 KB
testcase_04 AC 622 ms
269,772 KB
testcase_05 AC 626 ms
269,844 KB
testcase_06 AC 628 ms
270,340 KB
testcase_07 AC 569 ms
269,672 KB
testcase_08 AC 562 ms
269,740 KB
testcase_09 AC 582 ms
259,876 KB
testcase_10 AC 586 ms
269,832 KB
testcase_11 AC 640 ms
259,252 KB
testcase_12 AC 617 ms
269,888 KB
testcase_13 AC 574 ms
269,660 KB
testcase_14 AC 658 ms
267,944 KB
testcase_15 AC 580 ms
269,388 KB
testcase_16 AC 630 ms
269,492 KB
testcase_17 AC 625 ms
269,404 KB
testcase_18 AC 602 ms
269,612 KB
testcase_19 AC 60 ms
68,752 KB
testcase_20 AC 61 ms
69,300 KB
testcase_21 AC 61 ms
68,636 KB
testcase_22 AC 60 ms
69,216 KB
testcase_23 AC 61 ms
68,736 KB
testcase_24 AC 61 ms
67,988 KB
testcase_25 AC 60 ms
67,968 KB
testcase_26 AC 60 ms
68,108 KB
testcase_27 AC 62 ms
69,676 KB
testcase_28 AC 62 ms
69,596 KB
testcase_29 AC 61 ms
69,432 KB
testcase_30 AC 592 ms
269,780 KB
testcase_31 AC 583 ms
269,540 KB
testcase_32 AC 634 ms
259,664 KB
testcase_33 AC 628 ms
269,276 KB
testcase_34 AC 585 ms
269,448 KB
testcase_35 AC 112 ms
85,320 KB
testcase_36 AC 300 ms
125,612 KB
testcase_37 AC 101 ms
81,392 KB
testcase_38 AC 202 ms
118,972 KB
testcase_39 AC 342 ms
161,432 KB
testcase_40 AC 152 ms
94,560 KB
testcase_41 AC 497 ms
215,944 KB
testcase_42 AC 143 ms
94,312 KB
testcase_43 AC 427 ms
190,796 KB
testcase_44 AC 357 ms
159,800 KB
testcase_45 AC 742 ms
295,940 KB
testcase_46 AC 673 ms
295,644 KB
testcase_47 AC 660 ms
295,772 KB
testcase_48 AC 684 ms
295,668 KB
testcase_49 AC 617 ms
295,880 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 # 

from collections import defaultdict
from typing import List, Tuple
from typing import Callable, Generic, List, TypeVar

T = TypeVar("T")


class Rerooting(Generic[T]):

    __slots__ = ("adjList", "_n", "_decrement")

    def __init__(self, n: int, decrement: int = 0):
        self.adjList = [[] for _ in range(n)]
        self._n = n
        self._decrement = decrement

    def addEdge(self, u: int, v: int) -> None:
        u -= self._decrement
        v -= self._decrement
        self.adjList[u].append(v)
        self.adjList[v].append(u)

    def rerooting(
        self,
        e: Callable[[int], T],
        op: Callable[[T, T], T],
        composition: Callable[[T, int, int, int], T],
        root=0,
    ) -> List["T"]:
        root -= self._decrement
        assert 0 <= root < self._n
        parents = [-1] * self._n
        order = [root]
        stack = [root]
        while stack:
            cur = stack.pop()
            for next in self.adjList[cur]:
                if next == parents[cur]:
                    continue
                parents[next] = cur
                order.append(next)
                stack.append(next)

        dp1 = [e(i) for i in range(self._n)]
        dp2 = [e(i) for i in range(self._n)]
        for cur in order[::-1]:
            res = e(cur)
            for next in self.adjList[cur]:
                if parents[cur] == next:
                    continue
                dp2[next] = res
                res = op(res, composition(dp1[next], cur, next, 0))
            res = e(cur)
            for next in self.adjList[cur][::-1]:
                if parents[cur] == next:
                    continue
                dp2[next] = op(res, dp2[next])
                res = op(res, composition(dp1[next], cur, next, 0))
            dp1[cur] = res

        for newRoot in order[1:]:
            parent = parents[newRoot]
            dp2[newRoot] = composition(op(dp2[newRoot], dp2[parent]), parent, newRoot, 1)
            dp1[newRoot] = op(dp1[newRoot], dp2[newRoot])
        return dp1





def lcsOnTree(n: int, edges: List[Tuple[int, int, str]], target: str) -> int:
    def e(root: int) -> List[int]:
        return [0] * (len(target) + 1)

    def op(childRes1: List[int], childRes2: List[int]) -> List[int]:
        res = childRes1[:]
        for i in range(len(res)):
            if res[i] < childRes2[i]:
                res[i] = childRes2[i]
        return res

    def composition(fromRes: List[int], parent: int, cur: int, direction: int) -> List[int]:
        """direction: 0: cur -> parent, 1: parent -> cur"""
        from_, to = (cur, parent) if direction == 0 else (parent, cur)
        c = weights[from_][to]
        res = fromRes[:]
        for i in range(len(s) - 1, -1, -1):
            if s[i] == c:
                if res[i + 1] < res[i] + 1:
                    res[i + 1] = res[i] + 1
        for i in range(len(s)):
            if res[i + 1] < res[i]:
                res[i + 1] = res[i]
        return res

    R = Rerooting(n)
    weights = [defaultdict(str) for _ in range(n)]
    for u, v, c in edges:
        R.addEdge(u, v)
        weights[u][v] = c
        weights[v][u] = c

    dp = R.rerooting(e=e, op=op, composition=composition, root=0)
    return max(v[-1] for v in dp)
if __name__ == "__main__":
    n = int(input())
    s = input()
    edges = []
    for _ in range(n - 1):
        u, v, c = input().split()
        edges.append((int(u) - 1, int(v) - 1, c))

    print(lcsOnTree(n, edges, s))
0