結果

問題 No.1646 Avoid Palindrome
ユーザー ansainansain
提出日時 2021-08-13 21:56:04
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 1,592 ms / 3,000 ms
コード長 2,419 bytes
コンパイル時間 350 ms
コンパイル使用メモリ 82,432 KB
実行使用メモリ 79,360 KB
最終ジャッジ日時 2024-11-08 15:16:28
合計ジャッジ時間 42,444 ms
ジャッジサーバーID
(参考情報)
judge5 / judge1
このコードへのチャレンジ
(要ログイン)

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 56 ms
61,824 KB
testcase_01 AC 60 ms
63,616 KB
testcase_02 AC 59 ms
62,592 KB
testcase_03 AC 64 ms
64,768 KB
testcase_04 AC 1,276 ms
78,596 KB
testcase_05 AC 1,307 ms
78,428 KB
testcase_06 AC 1,454 ms
78,692 KB
testcase_07 AC 1,308 ms
78,436 KB
testcase_08 AC 1,315 ms
78,580 KB
testcase_09 AC 1,263 ms
78,532 KB
testcase_10 AC 1,471 ms
78,652 KB
testcase_11 AC 1,435 ms
78,940 KB
testcase_12 AC 1,293 ms
78,444 KB
testcase_13 AC 1,298 ms
78,704 KB
testcase_14 AC 1,037 ms
78,976 KB
testcase_15 AC 1,057 ms
79,232 KB
testcase_16 AC 1,040 ms
78,848 KB
testcase_17 AC 1,085 ms
79,360 KB
testcase_18 AC 1,048 ms
78,976 KB
testcase_19 AC 1,055 ms
78,848 KB
testcase_20 AC 1,060 ms
78,848 KB
testcase_21 AC 1,068 ms
79,360 KB
testcase_22 AC 1,050 ms
78,848 KB
testcase_23 AC 1,083 ms
79,104 KB
testcase_24 AC 1,115 ms
79,232 KB
testcase_25 AC 1,107 ms
79,104 KB
testcase_26 AC 1,117 ms
78,848 KB
testcase_27 AC 1,112 ms
79,360 KB
testcase_28 AC 1,124 ms
79,232 KB
testcase_29 AC 1,495 ms
78,992 KB
testcase_30 AC 1,591 ms
78,868 KB
testcase_31 AC 1,588 ms
78,860 KB
testcase_32 AC 1,592 ms
78,848 KB
testcase_33 AC 1,510 ms
78,720 KB
testcase_34 AC 1,101 ms
78,464 KB
testcase_35 AC 47 ms
54,016 KB
testcase_36 AC 47 ms
54,016 KB
testcase_37 AC 47 ms
54,272 KB
testcase_38 AC 46 ms
53,760 KB
testcase_39 AC 48 ms
53,888 KB
testcase_40 AC 46 ms
54,144 KB
testcase_41 AC 50 ms
59,392 KB
testcase_42 AC 51 ms
58,752 KB
testcase_43 AC 1,510 ms
78,848 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 #

import sys
from collections import defaultdict, Counter, deque
from itertools import permutations, combinations, product, combinations_with_replacement, groupby, accumulate
import operator
from math import sqrt, gcd, factorial
# from math import isqrt, prod, comb  #python3.8用(notpypy)
#from bisect import bisect_left, bisect_right
#from functools import lru_cache, reduce
#from heapq import heappush, heappop, heapify, heappushpop, heapreplace
#import numpy as np
#import networkx as nx
#from networkx.utils import UnionFind
#from numba import njit, b1, i1, i4, i8, f8
# numba例 @njit(i1(i4[:], i8[:, :]),cache=True) 引数i4配列、i8 2次元配列,戻り値i1
#from scipy.sparse import csr_matrix
#from scipy.sparse.csgraph import shortest_path, floyd_warshall, dijkstra, bellman_ford, johnson, NegativeCycleError, maximum_bipartite_matching, maximum_flow, minimum_spanning_tree
def input(): return sys.stdin.readline().rstrip()
def divceil(n, k): return 1+(n-1)//k  # n/kの切り上げを返す
def yn(hantei, yes='Yes', no='No'): print(yes if hantei else no)


def main():
    mod = 10**9+7
    mod2 = 998244353
    n = int(input())
    s = input()
    #s = '?'*(5*10**4)
    s = [ord(ss)-97 for ss in s]
    dp = [0]*(26**2)
    bet = list(range(26))
    if n == 1 and s == [-34]:
        print(26)
    elif n == 1:
        print(1)
    else:
        if s[:2] == [-34, -34]:
            for a, b in product(bet, repeat=2):
                if a != b:
                    dp[a*26+b] = 1
        elif s[0] == -34:
            for a in bet:
                if a != s[1]:
                    dp[a*26+s[1]] = 1
        elif s[1] == -34:
            for a in bet:
                if a != s[0]:
                    dp[s[0]*26+a] = 1
        elif s[0] != s[1]:
            dp[s[0]*26+s[1]] = 1
        for ss in s[2:]:
            newdp = [0]*(26**2)
            dpsum= [sum(dp[a*26+b] for a in bet)%mod2 for b in bet]
            if ss == -34:
                for b in bet:
                    for new in bet:
                        if b!=new:
                            newdp[b*26+new]=dpsum[b]-dp[new*26+b]
            else:
                for key, value in enumerate(dp):
                    v = value % mod2
                    if key//26 != ss and key % 26 != ss:
                        newdp[(key%26)*26+ss] += v
            dp = newdp
        print(sum(dp) % mod2)


if __name__ == '__main__':
    main()
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