結果

問題 No.3202 Periodic Alternating Subsequence
ユーザー lif4635
提出日時 2025-07-11 22:05:05
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 1,105 ms / 2,000 ms
コード長 4,188 bytes
コンパイル時間 395 ms
コンパイル使用メモリ 81,920 KB
実行使用メモリ 77,440 KB
最終ジャッジ日時 2025-07-11 22:05:29
合計ジャッジ時間 23,711 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 24
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 # 

# input
import sys
input = sys.stdin.readline
II = lambda : int(input())
MI = lambda : map(int, input().split())
LI = lambda : [int(a) for a in input().split()]
SI = lambda : input().rstrip()
LLI = lambda n : [[int(a) for a in input().split()] for _ in range(n)]
LSI = lambda n : [input().rstrip() for _ in range(n)]
MI_1 = lambda : map(lambda x:int(x)-1, input().split())
LI_1 = lambda : [int(a)-1 for a in input().split()]

def graph(n:int, m:int, dir:bool=False, index:int=-1) -> list[set[int]]:
    edge = [set() for i in range(n+1+index)]
    for _ in range(m):
        a,b = map(int, input().split())
        a += index
        b += index
        edge[a].add(b)
        if not dir:
            edge[b].add(a)
    return edge

def graph_w(n:int, m:int, dir:bool=False, index:int=-1) -> list[set[tuple]]:
    edge = [set() for i in range(n+1+index)]
    for _ in range(m):
        a,b,c = map(int, input().split())
        a += index
        b += index
        edge[a].add((b,c))
        if not dir:
            edge[b].add((a,c))
    return edge

mod = 998244353
inf = 1001001001001001001
ordalp = lambda s : ord(s)-65 if s.isupper() else ord(s)-97
ordallalp = lambda s : ord(s)-39 if s.isupper() else ord(s)-97
yes = lambda : print("Yes")
no = lambda : print("No")
yn = lambda flag : print("Yes" if flag else "No")
def acc(a:list[int]):
    sa = [0]*(len(a)+1)
    for i in range(len(a)):
        sa[i+1] = a[i] + sa[i]
    return sa

prinf = lambda ans : print(ans if ans < 1000001001001001001 else -1)
alplow = "abcdefghijklmnopqrstuvwxyz"
alpup = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
alpall = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
URDL = {'U':(-1,0), 'R':(0,1), 'D':(1,0), 'L':(0,-1)}
DIR_4 = [[-1,0],[0,1],[1,0],[0,-1]]
DIR_8 = [[-1,0],[-1,1],[0,1],[1,1],[1,0],[1,-1],[0,-1],[-1,-1]]
DIR_BISHOP = [[-1,1],[1,1],[1,-1],[-1,-1]]
prime60 = [2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59]
sys.set_int_max_str_digits(0)
# sys.setrecursionlimit(10**6)
# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')

from collections import defaultdict,deque
from heapq import heappop,heappush
from bisect import bisect_left,bisect_right
DD = defaultdict
BSL = bisect_left
BSR = bisect_right

mod = 10 ** 9 + 7

def mat_add(a, b):
    # assert len(a) == len(b)
    # assert len(a[0]) == len(b[0])
    n = len(a)
    m = len(a[0])
    res = [[0]*m for i in range(n)]
    for i in range(n):
        for j in range(m):
            res[i][j] = (a[i][j] + b[i][j])%mod
    return res

def mat_sub(a, b):
    # assert len(a) == len(b)
    # assert len(a[0]) == len(b[0])
    n = len(a)
    m = len(a[0])
    res = [[0]*m for i in range(n)]
    for i in range(n):
        for j in range(m):
            res[i][j] = (a[i][j] - b[i][j])%mod
    return res

def mat_mul(a, b):
    # assert len(a[0]) == len(b)
    n = len(a)
    m = len(b[0])
    res = [[0]*m for i in range(n)]
    for i,r_i in enumerate(res):
        for k,a_ik in enumerate(a[i]):
            for j,b_kj in enumerate(b[k]):
                r_i[j] = (r_i[j] + a_ik*b_kj)%mod
    return res

def mat_pow2(a):
    n = len(a)
    res = [[0]*n for i in range(n)]
    for i,r_i in enumerate(res):
        for k,a_ik in enumerate(a[i]):
            for j,a_kj in enumerate(a[k]):
                r_i[j] = (r_i[j] + a_ik*a_kj)%mod
    return res

def mat_inv(a, mod = mod):
    """いつか実装します"""
    pass

def mat_pow(a, exp):
    n = len(a)
    res = [[int(i == j) for j in range(n)] for i in range(n)]
    
    d = exp.bit_length()
    for i in range(d, -1, -1):
        if (exp >> i) & 1: res = mat_mul(res, a)
        if i == 0: return res
        res = mat_pow2(res)


t = SI()
k = II()

s = [1, 1, 0, 0, 0, 0]

# これが現状


mat = [[0] * 6 for i in range(6)]
for i in range(6):
    mat[i][i] = 1

n = len(t)
for i in range(n): 
    f = int(t[i])
    op = [[0] * 6 for i in range(6)]
    for i in range(6):
        op[i][i] = 1
    
    op[0^f][1^f] = 1
    op[2^f][3^f] = 1
    op[2^f][1^f] = 1
    op[4^f][1^f] = 1
    op[4^f][3^f] = 2
    op[4^f][5^f] = 1
    
    mat = mat_mul(mat, op)

mat = mat_pow(mat, k)

# print(mat)
ans = mat[4][0] + mat[5][0] + mat[4][1] + mat[5][1]
print(ans % mod)
0