結果

問題 No.1392 Don't be together
ユーザー mkawa2mkawa2
提出日時 2023-05-25 21:01:48
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 453 ms / 2,000 ms
コード長 2,285 bytes
コンパイル時間 1,607 ms
コンパイル使用メモリ 87,096 KB
実行使用メモリ 93,060 KB
最終ジャッジ日時 2023-08-25 23:36:50
合計ジャッジ時間 10,323 ms
ジャッジサーバーID
(参考情報)
judge15 / judge13
このコードへのチャレンジ
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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 94 ms
91,364 KB
testcase_01 AC 92 ms
91,420 KB
testcase_02 AC 92 ms
91,252 KB
testcase_03 AC 92 ms
91,288 KB
testcase_04 AC 92 ms
91,324 KB
testcase_05 AC 92 ms
91,288 KB
testcase_06 AC 260 ms
92,940 KB
testcase_07 AC 216 ms
92,604 KB
testcase_08 AC 316 ms
92,944 KB
testcase_09 AC 367 ms
93,060 KB
testcase_10 AC 335 ms
92,484 KB
testcase_11 AC 453 ms
92,556 KB
testcase_12 AC 317 ms
92,548 KB
testcase_13 AC 360 ms
92,588 KB
testcase_14 AC 366 ms
92,372 KB
testcase_15 AC 311 ms
92,520 KB
testcase_16 AC 430 ms
92,532 KB
testcase_17 AC 268 ms
92,556 KB
testcase_18 AC 360 ms
92,600 KB
testcase_19 AC 285 ms
92,492 KB
testcase_20 AC 296 ms
92,700 KB
testcase_21 AC 245 ms
92,408 KB
testcase_22 AC 294 ms
92,552 KB
testcase_23 AC 264 ms
92,404 KB
testcase_24 AC 233 ms
92,476 KB
testcase_25 AC 317 ms
92,404 KB
testcase_26 AC 250 ms
92,484 KB
testcase_27 AC 251 ms
92,552 KB
testcase_28 AC 318 ms
92,368 KB
testcase_29 AC 310 ms
92,412 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

# sys.setrecursionlimit(200005)
# sys.set_int_max_str_digits(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()

# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = (1 << 63)-1
# md = 10**9+7
md = 998244353

def nCr(com_n, com_r):
    if com_r < 0: return 0
    if com_n < com_r: return 0
    return fac[com_n]*ifac[com_r]%md*ifac[com_n-com_r]%md

n_max = 200005
fac = [1]
for i in range(1, n_max+1): fac.append(fac[-1]*i%md)
ifac = [1]*(n_max+1)
ifac[n_max] = pow(fac[n_max], md-2, md)
for i in range(n_max-1, 1, -1): ifac[i] = ifac[i+1]*(i+1)%md

def size(i):
    res = 0
    while fin[i] == 0:
        fin[i] = 1
        res += 1
        i = pp[i]
    return res

def dot(aa, bb):
    h = len(aa)
    w = len(bb[0])
    res = [[0]*w for _ in range(h)]
    for j, col in enumerate(zip(*bb)):
        for i in range(h):
            v = 0
            # for a, b in zip(row, col): v += a*b
            # res[i][j] = v
            for a, b in zip(aa[i], col): v += a*b%md
            res[i][j] = v%md
    return res

def matpow(mat, e0):
    if e0 in memo: return memo[e0]
    e=e0
    n = len(mat)
    res = [[1 if i == j else 0 for j in range(n)] for i in range(n)]
    while e:
        if e & 1: res = dot(res, mat)
        mat = dot(mat, mat)
        e >>= 1
    memo[e0] = res
    return res

n, m = LI()
pp = LI1()

ss = []
fin = [0]*n
for i in range(n):
    if fin[i]: continue
    ss.append(size(i))
# pDB(ss)

ans = 0
# du=disuse
for du in range(m-1):
    c = m-du
    mat = [[0, c-1],
           [1, c-2]]
    cur = 1
    memo = {}
    for s in ss:
        cur *= matpow(mat, s)[0][0]*c%md
        cur %= md
    cur = cur*nCr(m, du)%md
    if du & 1:
        ans -= cur
    else:
        ans += cur
    ans %= md

ans *= ifac[m]
print(ans%md)
0