結果
| 問題 | No.3038 シャッフルの再現 |
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-04-15 23:34:17 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
RE
|
| 実行時間 | - |
| コード長 | 3,310 bytes |
| 記録 | |
| コンパイル時間 | 175 ms |
| コンパイル使用メモリ | 82,400 KB |
| 実行使用メモリ | 69,876 KB |
| 最終ジャッジ日時 | 2025-04-15 23:35:15 |
| 合計ジャッジ時間 | 2,427 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | RE * 1 |
| other | RE * 21 |
ソースコード
import sys
from math import gcd
from random import randint
MOD = 10**9 + 7
def input():
return sys.stdin.read()
def factor(n):
factors = {}
while n % 2 == 0:
factors[2] = factors.get(2, 0) + 1
n = n // 2
if n == 1:
return factors
def is_prime(num):
if num < 2:
return False
for p in [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31]:
if num % p == 0:
return num == p
d = num - 1
s = 0
while d % 2 == 0:
d //= 2
s += 1
for a in [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31]:
if a >= num:
continue
x = pow(a, d, num)
if x == 1 or x == num - 1:
continue
for _ in range(s - 1):
x = pow(x, 2, num)
if x == num - 1:
break
else:
return False
return True
def pollards_rho(num):
if num % 2 == 0:
return 2
if num % 3 == 0:
return 3
while True:
c = randint(1, num - 1)
f = lambda x: (pow(x, 2, num) + c) % num
x, y, d = 2, 2, 1
while d == 1:
x = f(x)
y = f(f(y))
d = gcd(abs(x - y), num)
if d != num:
return d
def _factor(num, fact_dict):
if num == 1:
return
if is_prime(num):
fact_dict[num] = fact_dict.get(num, 0) + 1
return
d = pollards_rho(num)
_factor(d, fact_dict)
_factor(num // d, fact_dict)
_factor(n, factors)
return factors
def generate_divisors(factors):
divisors = [1]
for q, e in sorted(factors.items()):
current_divisors = []
for d in divisors:
power = 1
for _ in range(e + 1):
current_divisors.append(d * power)
power *= q
divisors = current_divisors
divisors = sorted(divisors)
return divisors
def fib_mod(n, mod):
a, b = 0, 1
bits = []
if n == 0:
return (0, 1)
while n > 0:
bits.append(n % 2)
n = n // 2
bits.reverse()
for bit in bits:
c = a * (2 * b - a) % mod
d = (a * a + b * b) % mod
if bit:
a, b = d, (c + d) % mod
else:
a, b = c, d
return (a, b)
def compute_pisano_period(p):
if p == 2:
return 3
if p == 5:
return 20
rem = p % 5
if rem in (1, 4):
m = p - 1
else:
m = 2 * (p + 1)
factors = factor(m)
divisors = generate_divisors(factors)
for d in divisors:
if d == 0:
continue
fn, fn_plus_1 = fib_mod(d, p)
if fn == 0 and fn_plus_1 == 1:
return d
return m
def main():
data = sys.stdin.read().split()
idx = 0
N = int(data[idx])
idx += 1
lcm_val = 1
for _ in range(N):
p = int(data[idx])
k = int(data[idx + 1])
idx += 2
period_p = compute_pisano_period(p)
L_i = period_p * pow(p, k - 1, MOD * 1000)
g = gcd(lcm_val, L_i)
lcm_val = (lcm_val // g) * L_i
print(lcm_val % MOD)
if __name__ == '__main__':
main()
lam6er