結果

問題 No.1740 Alone 'a'
ユーザー MasKoaTS
提出日時 2021-11-13 12:55:35
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 447 ms / 2,000 ms
コード長 1,696 bytes
コンパイル時間 155 ms
コンパイル使用メモリ 82,124 KB
実行使用メモリ 177,792 KB
最終ジャッジ日時 2024-11-27 07:16:20
合計ジャッジ時間 12,610 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge1
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ファイルパターン 結果
sample AC * 3
other AC * 38
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 #
プレゼンテーションモードにする

import itertools as iter
import collections as coll
import heapq as hq
import bisect as bis
from decimal import Decimal as dec
from copy import deepcopy as dcopy
import math
import sys
sys.setrecursionlimit(10**6)
def input():
    return sys.stdin.readline().rstrip()
def getN():
    return int(sys.stdin.readline())
def getNs():
    return map(int,sys.stdin.readline().split())
def getList():
    return list(map(int,sys.stdin.readline().split()))
def strinps(n):
    return [sys.stdin.readline().rstrip() for _ in range(n)]
pi = 3.141592653589793
mod = 10**9+7
MOD = 998244353
INF = math.inf
dx = [1,0,-1,0];    dy = [0,1,0,-1]
def ctoi(char):
    return ord(char)-ord('a')
"""
Main Code
"""
n = getN()
s = input()
l = [ctoi(c) for c in s]
dp = [[0]*4 for _ in [0]*n]
ndp = dcopy(dp)
dp[0][0b00] = max(0,l[0]-1)
dp[0][0b01] = int(l[0] != 0)
dp[0][0b10] = int(l[0] != 0)
dp[0][0b11] = int(l[0] == 0)
#print(dp)
for i in range(1,n):
    # 0 を 1 つも含まず、S より小さい
    dp[i][0b00] += dp[i-1][0b00] * 25;              dp[i][0b00] %= MOD
    dp[i][0b00] += dp[i-1][0b10] * max(0,l[i]-1);   dp[i][0b00] %= MOD
    # 0 を 1 つだけ含み、S より小さい
    dp[i][0b01] += dp[i-1][0b00];                   dp[i][0b01] %= MOD
    dp[i][0b01] += dp[i-1][0b01] * 25;              dp[i][0b01] %= MOD
    dp[i][0b01] += dp[i-1][0b10] * (l[i] != 0);     dp[i][0b01] %= MOD
    dp[i][0b01] += dp[i-1][0b11] * max(0,l[i]-1);   dp[i][0b01] %= MOD
    # 0 を 1 つも含まず、S と等しい
    dp[i][0b10] += dp[i-1][0b10] * (l[i] != 0);     dp[i][0b10] %= MOD
    # 0 を 1 つだけ含み、S と等しい
    dp[i][0b11] += dp[i-1][0b10] * (l[i] == 0);     dp[i][0b11] %= MOD
    dp[i][0b11] += dp[i-1][0b11] * (l[i] != 0);     dp[i][0b10] %= MOD
    #print(dp)
print(dp[n-1][0b01])
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