結果

問題 No.2720 Sum of Subarray of Subsequence of...
ユーザー ecotteaecottea
提出日時 2024-03-11 18:37:16
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 1,555 ms / 4,000 ms
コード長 6,838 bytes
コンパイル時間 302 ms
コンパイル使用メモリ 82,556 KB
実行使用メモリ 201,808 KB
最終ジャッジ日時 2024-10-01 01:29:36
合計ジャッジ時間 18,799 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge5
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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 43 ms
56,188 KB
testcase_01 AC 44 ms
56,712 KB
testcase_02 AC 42 ms
55,168 KB
testcase_03 AC 42 ms
56,684 KB
testcase_04 AC 41 ms
55,484 KB
testcase_05 AC 41 ms
55,716 KB
testcase_06 AC 41 ms
56,232 KB
testcase_07 AC 41 ms
55,364 KB
testcase_08 AC 65 ms
72,520 KB
testcase_09 AC 72 ms
74,468 KB
testcase_10 AC 81 ms
77,084 KB
testcase_11 AC 82 ms
76,624 KB
testcase_12 AC 85 ms
77,024 KB
testcase_13 AC 96 ms
77,420 KB
testcase_14 AC 348 ms
109,284 KB
testcase_15 AC 543 ms
116,124 KB
testcase_16 AC 716 ms
126,756 KB
testcase_17 AC 792 ms
132,476 KB
testcase_18 AC 924 ms
146,280 KB
testcase_19 AC 1,030 ms
155,348 KB
testcase_20 AC 1,074 ms
162,548 KB
testcase_21 AC 1,218 ms
178,028 KB
testcase_22 AC 1,345 ms
184,760 KB
testcase_23 AC 1,427 ms
190,724 KB
testcase_24 AC 1,508 ms
201,808 KB
testcase_25 AC 42 ms
55,624 KB
testcase_26 AC 42 ms
57,192 KB
testcase_27 AC 715 ms
119,700 KB
testcase_28 AC 362 ms
108,376 KB
testcase_29 AC 355 ms
107,792 KB
testcase_30 AC 1,555 ms
201,768 KB
testcase_31 AC 1,511 ms
196,528 KB
testcase_32 AC 1,069 ms
155,852 KB
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ソースコード

diff # 

# https://judge.yosupo.jp/submission/55648 より拝借

########################### ここから ###########################
# AtCoder Libary v1.4 を python に移植したもの
# https://github.com/atcoder/ac-library/blob/master/atcoder/convolution.hpp

MOD = 998244353
IMAG = 911660635
IIMAG = 86583718
rate2 = (0, 911660635, 509520358, 369330050, 332049552, 983190778, 123842337, 238493703, 975955924, 603855026, 856644456, 131300601, 842657263, 730768835, 942482514, 806263778, 151565301, 510815449, 503497456, 743006876, 741047443, 56250497, 867605899, 0)
irate2 = (0, 86583718, 372528824, 373294451, 645684063, 112220581, 692852209, 155456985, 797128860, 90816748, 860285882, 927414960, 354738543, 109331171, 293255632, 535113200, 308540755, 121186627, 608385704, 438932459, 359477183, 824071951, 103369235, 0)
rate3 = (0, 372528824, 337190230, 454590761, 816400692, 578227951, 180142363, 83780245, 6597683, 70046822, 623238099, 183021267, 402682409, 631680428, 344509872, 689220186, 365017329, 774342554, 729444058, 102986190, 128751033, 395565204, 0)
irate3 = (0, 509520358, 929031873, 170256584, 839780419, 282974284, 395914482, 444904435, 72135471, 638914820, 66769500, 771127074, 985925487, 262319669, 262341272, 625870173, 768022760, 859816005, 914661783, 430819711, 272774365, 530924681, 0)

def butterfly(a):
  n = len(a)
  h = (n - 1).bit_length()
  le = 0
  while le < h:
    if h - le == 1:
      p = 1 << (h - le - 1)
      rot = 1
      for s in range(1 << le):
        offset = s << (h - le)
        for i in range(p):
          l = a[i + offset]
          r = a[i + offset + p] * rot
          a[i + offset] = (l + r) % MOD
          a[i + offset + p] = (l - r) % MOD
        rot *= rate2[(~s & -~s).bit_length()]
        rot %= MOD
      le += 1
    else:
      p = 1 << (h - le - 2)
      rot = 1
      for s in range(1 << le):
        rot2 = rot * rot % MOD
        rot3 = rot2 * rot % MOD
        offset = s << (h - le)
        for i in range(p):
          a0 = a[i + offset]
          a1 = a[i + offset + p] * rot
          a2 = a[i + offset + p * 2] * rot2
          a3 = a[i + offset + p * 3] * rot3
          a1na3imag = (a1 - a3) % MOD * IMAG
          a[i + offset] = (a0 + a2 + a1 + a3) % MOD
          a[i + offset + p] = (a0 + a2 - a1 - a3) % MOD
          a[i + offset + p * 2] = (a0 - a2 + a1na3imag) % MOD
          a[i + offset + p * 3] = (a0 - a2 - a1na3imag) % MOD
        rot *= rate3[(~s & -~s).bit_length()]
        rot %= MOD
      le += 2

def butterfly_inv(a):
  n = len(a)
  h = (n - 1).bit_length()
  le = h
  while le:
    if le == 1:
      p = 1 << (h - le)
      irot = 1
      for s in range(1 << (le - 1)):
        offset = s << (h - le + 1)
        for i in range(p):
          l = a[i + offset]
          r = a[i + offset + p]
          a[i + offset] = (l + r) % MOD
          a[i + offset + p] = (l - r) * irot % MOD
        irot *= irate2[(~s & -~s).bit_length()]
        irot %= MOD
      le -= 1
    else:
      p = 1 << (h - le)
      irot = 1
      for s in range(1 << (le - 2)):
        irot2 = irot * irot % MOD
        irot3 = irot2 * irot % MOD
        offset = s << (h - le + 2)
        for i in range(p):
          a0 = a[i + offset]
          a1 = a[i + offset + p]
          a2 = a[i + offset + p * 2]
          a3 = a[i + offset + p * 3]
          a2na3iimag = (a2 - a3) * IIMAG % MOD
          a[i + offset] = (a0 + a1 + a2 + a3) % MOD
          a[i + offset + p] = (a0 - a1 + a2na3iimag) * irot % MOD
          a[i + offset + p * 2] = (a0 + a1 - a2 - a3) * irot2 % MOD
          a[i + offset + p * 3] = (a0 - a1 - a2na3iimag) * irot3 % MOD
        irot *= irate3[(~s & -~s).bit_length()]
        irot %= MOD
      le -= 2

def multiply(s, t):
  n = len(s)
  m = len(t)
  if min(n, m) <= 60:
    a = [0] * (n + m - 1)
    for i in range(n):
      if i % 8 == 0:        
        for j in range(m):
          a[i + j] += s[i] * t[j]
          a[i + j] %= MOD
      else:
        for j in range(m):
          a[i + j] += s[i] * t[j]
    return [x % MOD for x in a]
  a = s.copy()
  b = t.copy()
  z = 1 << (n + m - 2).bit_length()
  a += [0] * (z - n)
  b += [0] * (z - m)
  butterfly(a)
  butterfly(b)
  for i in range(z):
    a[i] *= b[i]
    a[i] %= MOD
  butterfly_inv(a)
  a = a[:n + m - 1]
  iz = pow(z, MOD - 2, MOD)
  return [v * iz % MOD for v in a]

import atexit
import os
import sys
import __pypy__


class Fastio:
  def __init__(self):
    self.ibuf = bytes()
    self.pil = 0
    self.pir = 0
    self.sb = __pypy__.builders.StringBuilder()

  def load(self):
    self.ibuf = self.ibuf[self.pil:]
    self.ibuf += os.read(0, 131072)
    self.pil = 0
    self.pir = len(self.ibuf)

  def flush(self):
    os.write(1, self.sb.build().encode())

  def fastin(self):
    if self.pir - self.pil < 32:
      self.load()
    minus = 0
    x = 0
    while self.ibuf[self.pil] < 45:
      self.pil += 1
    if self.ibuf[self.pil] == 45:
      minus = 1
      self.pil += 1
    while self.ibuf[self.pil] >= 48:
      x = x * 10 + (self.ibuf[self.pil] & 15)
      self.pil += 1
    if minus:
      x = -x
    return x

  def fastout(self, x):
    self.sb.append(str(x))

  def fastoutln(self, x):
    self.sb.append(str(x))
    self.sb.append('\n')
########################### ここまで ###########################


from collections import deque

n, m = map(int, input().split())
a = list(map(int, input().split()))
s = input()

MOD = 998244353

cnt_s = [0] * m
for j in range(m):
    if s[j] == 's':
        cnt_s[j] = 1

acc_s = [0] * (m + 1)
for j in range(m - 1, -1, -1):
    acc_s[j] = acc_s[j + 1] + cnt_s[j]

nums = [[1]]
dnms = [[1, -acc_s[0]-1]]

for j in range(m):
    if s[j] == 'a':
        nums.append([1, -acc_s[j]])
        dnms.append([1, -acc_s[j]-1])

# 分子を分割統治法で求める．
Dnum = len(nums)
d = 1
while (d < Dnum):
    for i in range(0, Dnum - d, 2 * d):
        nums[i] = multiply(nums[i], nums[i + d])
    d <<= 1

# 分母を分割統治法で求める．
Ddnm = len(dnms)
d = 1
while (d < Ddnm):
    for i in range(0, Ddnm - d, 2 * d):
        dnms[i] = multiply(dnms[i], dnms[i + d])
    d <<= 1

# 分母の形式的冪級数としての逆元を求める．
while len(dnms[0]) > n:
    dnms[0].pop()
while len(dnms[0]) < n:
    dnms[0].append(0)

dnm_inv = [1]

k = 1
while (k < n):
    l = min(2 * k, n)
    tmp = [0] * l
    i_ub = min(l, n)
    for i in range(i_ub):
        tmp[i] = -dnms[0][i]
    tmp = multiply(tmp, dnm_inv)
    while len(tmp) > l:
        tmp.pop()
    tmp[0] += 2
    dnm_inv = multiply(tmp, dnm_inv)
    while len(dnm_inv) > l:
        dnm_inv.pop()

    k <<= 1

# g_M(x) を求める．
f = multiply(nums[0], dnm_inv)

# 答えへの寄与を足し合わせる．
res = 0
for i in range(n):
    l = i
    r = n - 1 - i
    res = (res + a[i] * f[l] % MOD * f[r] % MOD) % MOD

print(res)
0