結果
問題 | No.1302 Random Tree Score |
ユーザー | zkou |
提出日時 | 2020-11-28 12:59:00 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 2,990 ms / 3,000 ms |
コード長 | 3,064 bytes |
コンパイル時間 | 384 ms |
コンパイル使用メモリ | 82,308 KB |
実行使用メモリ | 248,688 KB |
最終ジャッジ日時 | 2024-09-12 22:22:58 |
合計ジャッジ時間 | 25,112 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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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 | 49 ms
68,800 KB |
testcase_01 | AC | 51 ms
67,928 KB |
testcase_02 | AC | 660 ms
116,448 KB |
testcase_03 | AC | 1,503 ms
164,524 KB |
testcase_04 | AC | 634 ms
114,512 KB |
testcase_05 | AC | 2,735 ms
248,688 KB |
testcase_06 | AC | 2,178 ms
220,084 KB |
testcase_07 | AC | 593 ms
113,656 KB |
testcase_08 | AC | 1,588 ms
179,632 KB |
testcase_09 | AC | 2,528 ms
217,164 KB |
testcase_10 | AC | 2,697 ms
213,484 KB |
testcase_11 | AC | 603 ms
108,844 KB |
testcase_12 | AC | 2,557 ms
240,980 KB |
testcase_13 | AC | 49 ms
68,232 KB |
testcase_14 | AC | 2,538 ms
216,584 KB |
testcase_15 | AC | 2,990 ms
242,956 KB |
testcase_16 | AC | 50 ms
68,108 KB |
ソースコード
_fft_mod = 998244353 _fft_sum_e = [911660635, 509520358, 369330050, 332049552, 983190778, 123842337, 238493703, 975955924, 603855026, 856644456, 131300601, 842657263, 730768835, 942482514, 806263778, 151565301, 510815449, 503497456, 743006876, 741047443, 56250497, 0, 0, 0, 0, 0, 0, 0, 0, 0] _fft_sum_ie = [86583718, 372528824, 373294451, 645684063, 112220581, 692852209, 155456985, 797128860, 90816748, 860285882, 927414960, 354738543, 109331171, 293255632, 535113200, 308540755, 121186627, 608385704, 438932459, 359477183, 824071951, 0, 0, 0, 0, 0, 0, 0, 0, 0] def butterfly_998244353(a): n = len(a) h = (n - 1).bit_length() for ph in range(1, h + 1): w = 1 << (ph - 1) p = 1 << (h - ph) now = 1 for s in range(w): offset = s << (h - ph + 1) for i in range(p): l = a[i + offset] r = a[i + offset + p] * now % _fft_mod a[i + offset] = (l + r) % _fft_mod a[i + offset + p] = (l - r) % _fft_mod now = now * _fft_sum_e[(~s & -~s).bit_length() - 1] % _fft_mod def butterfly_inv_998244353(a): n = len(a) h = (n - 1).bit_length() for ph in range(h, 0, -1): w = 1 << (ph - 1) p = 1 << (h - ph) inow = 1 for s in range(w): offset = s << (h - ph + 1) for i in range(p): l = a[i + offset] r = a[i + offset + p] a[i + offset] = (l + r) % _fft_mod a[i + offset + p] = (l - r) * inow % _fft_mod inow = inow * _fft_sum_ie[(~s & -~s).bit_length() - 1] % _fft_mod def convolution_998244353(a, b): a = a.copy() b = b.copy() n = len(a) m = len(b) if n == 0 or m == 0: return [] if min(n, m) <= 60: if n < m: n, m = m, n a, b = b, a ans = [0] * (n + m - 1) for i in range(n): for j in range(m): ans[i + j] = (ans[i + j] + a[i] * b[j] % _fft_mod) % _fft_mod return ans z = 1 << (n + m - 2).bit_length() a += [0] * (z - n) b += [0] * (z - m) butterfly_998244353(a) butterfly_998244353(b) for i in range(z): a[i] = a[i] * b[i] % _fft_mod butterfly_inv_998244353(a) a = a[:n + m - 1] iz = pow(z, _fft_mod - 2, _fft_mod) for i in range(n + m - 1): a[i] = a[i] * iz % _fft_mod return a import sys input = sys.stdin.readline MOD = 998244353 table_len = 10 ** 5 + 10 fac = [1, 1] for i in range(2, table_len): fac.append(fac[-1] * i % MOD) finv = [0] * table_len finv[-1] = pow(fac[-1], MOD - 2, MOD) for i in range(table_len-1, 0, -1): finv[i - 1] = finv[i] * i % MOD N = int(input()) f = [(i + 1) * finv[i] % MOD for i in range(N - 1)] ans = f for d in (format(N, 'b')[1:]): ans = convolution_998244353(ans, ans)[:N - 1] if d == '1': ans = convolution_998244353(ans, f)[:N - 1] print(ans[N - 2] * fac[N - 2] % MOD * pow(N, MOD - N + 1, MOD) % MOD)