結果
| 問題 | No.777 再帰的ケーキ |
| コンテスト | |
| ユーザー |
norioc
|
| 提出日時 | 2025-03-20 06:30:36 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 920 ms / 2,000 ms |
| コード長 | 4,458 bytes |
| コンパイル時間 | 428 ms |
| コンパイル使用メモリ | 82,100 KB |
| 実行使用メモリ | 184,708 KB |
| 最終ジャッジ日時 | 2025-03-20 06:30:48 |
| 合計ジャッジ時間 | 11,312 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 33 |
ソースコード
import typing
import sys
input = sys.stdin.readline
def _ceil_pow2(n: int) -> int:
x = 0
while (1 << x) < n:
x += 1
return x
class SegTree:
def __init__(self,
op: typing.Callable[[typing.Any, typing.Any], typing.Any],
e: typing.Any,
v: typing.Union[int, typing.List[typing.Any]]) -> None:
self._op = op
self._e = e
if isinstance(v, int):
v = [e] * v
self._n = len(v)
self._log = _ceil_pow2(self._n)
self._size = 1 << self._log
self._d = [e] * (2 * self._size)
for i in range(self._n):
self._d[self._size + i] = v[i]
for i in range(self._size - 1, 0, -1):
self._update(i)
def set(self, p: int, x: typing.Any) -> None:
assert 0 <= p < self._n
p += self._size
self._d[p] = x
for i in range(1, self._log + 1):
self._update(p >> i)
def get(self, p: int) -> typing.Any:
assert 0 <= p < self._n
return self._d[p + self._size]
def prod(self, left: int, right: int) -> typing.Any:
assert 0 <= left <= right <= self._n
sml = self._e
smr = self._e
left += self._size
right += self._size
while left < right:
if left & 1:
sml = self._op(sml, self._d[left])
left += 1
if right & 1:
right -= 1
smr = self._op(self._d[right], smr)
left >>= 1
right >>= 1
return self._op(sml, smr)
def all_prod(self) -> typing.Any:
return self._d[1]
def max_right(self, left: int,
f: typing.Callable[[typing.Any], bool]) -> int:
assert 0 <= left <= self._n
assert f(self._e)
if left == self._n:
return self._n
left += self._size
sm = self._e
first = True
while first or (left & -left) != left:
first = False
while left % 2 == 0:
left >>= 1
if not f(self._op(sm, self._d[left])):
while left < self._size:
left *= 2
if f(self._op(sm, self._d[left])):
sm = self._op(sm, self._d[left])
left += 1
return left - self._size
sm = self._op(sm, self._d[left])
left += 1
return self._n
def min_left(self, right: int,
f: typing.Callable[[typing.Any], bool]) -> int:
assert 0 <= right <= self._n
assert f(self._e)
if right == 0:
return 0
right += self._size
sm = self._e
first = True
while first or (right & -right) != right:
first = False
right -= 1
while right > 1 and right % 2:
right >>= 1
if not f(self._op(self._d[right], sm)):
while right < self._size:
right = 2 * right + 1
if f(self._op(self._d[right], sm)):
sm = self._op(self._d[right], sm)
right -= 1
return right + 1 - self._size
sm = self._op(self._d[right], sm)
return 0
def _update(self, k: int) -> None:
self._d[k] = self._op(self._d[2 * k], self._d[2 * k + 1])
class Compression:
def __init__(self, iterable):
self.vs = sorted(set(iterable))
self.n = len(self.vs)
self.v2i = {}
for i, val in enumerate(self.vs):
self.v2i[val] = i
def __len__(self):
return self.n
def index(self, val):
"""val のインデックスを返す"""
return self.v2i[val]
def value(self, index):
"""インデックスに対応する値を返す"""
return self.vs[index]
from collections import defaultdict
N = int(input())
bset = set()
d = defaultdict(list)
for _ in range(N):
A, B, C = map(int, input().split())
d[A].append((B, C))
bset.add(B)
comp = Compression(bset)
segt = SegTree(max, 0, [0] * (len(comp)+10))
for a in sorted(d.keys()):
# 同一の a は、b を降順に更新していく
for b, c in sorted(d[a], reverse=True):
nb = comp.index(b)
x = segt.prod(0, nb)
segt.set(nb, max(x+c, segt.get(nb)))
ans = segt.all_prod()
print(ans)
norioc