結果
| 問題 |
No.1322 Totient Bound
|
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-04-15 22:30:49 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 1,648 bytes |
| コンパイル時間 | 493 ms |
| コンパイル使用メモリ | 81,528 KB |
| 実行使用メモリ | 146,980 KB |
| 最終ジャッジ日時 | 2025-04-15 22:32:54 |
| 合計ジャッジ時間 | 7,681 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 10 TLE * 1 -- * 25 |
ソースコード
def is_prime(n):
if n < 2:
return False
for p in [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37]:
if n % p == 0:
return n == p
d = n - 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, 37]:
if a >= n:
continue
x = pow(a, d, n)
if x == 1 or x == n - 1:
continue
for _ in range(s - 1):
x = pow(x, 2, n)
if x == n - 1:
break
else:
return False
return True
def count_totient_bound(N):
count = 0
stack = []
stack.append((0, 1, 1)) # (last_p, product_p_minus_1, current_phi)
while stack:
last_p, product_p_minus_1, current_phi = stack.pop()
count += 1
R = N // current_phi
p = last_p + 1
while True:
if product_p_minus_1 * (p - 1) > N:
break
if p > R + 1:
break
if is_prime(p):
contribution = (p - 1)
total_contribution = contribution
k = 1
while True:
if current_phi * total_contribution > N:
break
new_product_p_minus_1 = product_p_minus_1 * (p - 1)
new_phi = current_phi * total_contribution
stack.append((p, new_product_p_minus_1, new_phi))
total_contribution *= p
k += 1
p += 1
return count
# Read input and output the result
N = int(input())
print(count_totient_bound(N))
lam6er