結果

問題 No.811 約数の個数の最大化
ユーザー McGregorshMcGregorsh
提出日時 2022-07-04 20:09:30
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 623 ms / 2,000 ms
コード長 4,470 bytes
コンパイル時間 476 ms
コンパイル使用メモリ 87,092 KB
実行使用メモリ 104,748 KB
最終ジャッジ日時 2023-08-21 04:14:22
合計ジャッジ時間 8,012 ms
ジャッジサーバーID
（参考情報） 		judge12 / judge13
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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 240 ms
93,156 KB
testcase_01 AC 360 ms
98,388 KB
testcase_02 AC 596 ms
104,340 KB
testcase_03 AC 235 ms
93,264 KB
testcase_04 AC 279 ms
97,596 KB
testcase_05 AC 346 ms
99,152 KB
testcase_06 AC 362 ms
100,628 KB
testcase_07 AC 381 ms
100,092 KB
testcase_08 AC 476 ms
103,488 KB
testcase_09 AC 527 ms
103,640 KB
testcase_10 AC 486 ms
103,964 KB
testcase_11 AC 547 ms
104,000 KB
testcase_12 AC 409 ms
101,436 KB
testcase_13 AC 623 ms
104,748 KB
testcase_14 AC 574 ms
102,832 KB
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ソースコード

diff # 

###素因数分解###

def prime_factorize(n: int) -> list:
   return_list = []
   while n % 2 == 0:
   	  return_list.append(2)
   	  n //= 2
   f = 3
   while f * f <= n:
   	  if n % f == 0:
   	  	  return_list.append(f)
   	  	  n //= f
   	  else:
   	  	  f += 2
   if n != 1:
   	  return_list.append(n)
   return return_list


###ある数が素数かどうかの判定###

import math

def is_prime(n):
	  sqrt_n = math.ceil(math.sqrt(n))
	  for i in range(2, sqrt_n):
	  	  if n % i == 0:
	  	  	  return False
	  return True


###N以下の素数列挙###

import math 
def sieve_of_eratosthenes(n):
	  prime = [True for i in range(n+1)]
	  prime[0] = False
	  prime[1] = False
	  
	  sqrt_n = math.ceil(math.sqrt(n))
	  for i in range(2, sqrt_n+1):
	  	  if prime[i]:
	  	  	  for j in range(2*i, n+1, i):
	  	  	  	  prime[j] = False
	  return prime


###N以上K以下の素数列挙###

import math

def segment_sieve(a, b):
	  sqrt_b = math.ceil(math.sqrt(b))
	  prime_small = [True for i in range(sqrt_b)]
	  prime = [True for i in range(b-a+1)]
	  
	  for i in range(2, sqrt_b):
	  	  if prime_small[i]:
	  	  	  for j in range(2*i, sqrt_b, i):
	  	  	  	  prime_small[j] = False
	  	  	  for j in range((a+i-1)//i*i, b+1, i):
	  	  	  	  #print('j: ', j)
	  	  	  	  prime[j-a] = False
	  return prime


###n進数から10進数変換###

def base_10(num_n,n):
	  num_10 = 0
	  for s in str(num_n):
	  	  num_10 *= n
	  	  num_10 += int(s)
	  return num_10


###10進数からn進数変換###

def base_n(num_10,n):
	  str_n = ''
	  while num_10:
	  	  if num_10%n>=10:
	  	  	  return -1
	  	  str_n += str(num_10%n)
	  	  num_10 //= n
	  return int(str_n[::-1])


###複数の数の最大公約数、最小公倍数###

from functools import reduce

# 最大公約数
def gcd_list(num_list: list) -> int:
	  return reduce(gcd, num_list)

# 最小公倍数
def lcm_base(x: int, y: int) -> int:
	  return (x * y) // gcd(x, y)
def lcm_list(num_list: list):
	  return reduce(lcm_base, num_list, 1)


###約数列挙###

def make_divisors(n):
	  lower_divisors, upper_divisors = [], []
	  i = 1
	  while i * i <= n:
	  	  if n % i == 0:
	  	  	  lower_divisors.append(i)
	  	  	  if i != n // i:
	  	  	  	  upper_divisors.append(n//i)
	  	  i += 1
	  return lower_divisors + upper_divisors[::-1]


###順列###

def nPr(n, r):
	  npr = 1
	  for i in range(n, n-r, -1):
	  	  npr *= i
	  return npr


###組合せ###

def nCr(n, r):
	  factr = 1
	  r = min(r, n - r)
	  for i in range(r, 1, -1):
	  	  factr *= i
	  return nPr(n, r)/factr



import sys, re
from math import ceil, floor, sqrt, pi, factorial, gcd
from copy import deepcopy
from collections import Counter, deque, defaultdict
from heapq import heapify, heappop, heappush
from itertools import accumulate, product, combinations, combinations_with_replacement, permutations
from bisect import bisect, bisect_left, bisect_right
from functools import reduce
from decimal import Decimal, getcontext
def i_input(): return int(input())
def i_map(): return map(int, input().split())
def i_list(): return list(i_map())
def i_row(N): return [i_input() for _ in range(N)]
def i_row_list(N): return [i_list() for _ in range(N)]
def s_input(): return input()
def s_map(): return input().split()
def s_list(): return list(s_map())
def s_row(N): return [s_input for _ in range(N)]
def s_row_str(N): return [s_list() for _ in range(N)]
def s_row_list(N): return [list(s_input()) for _ in range(N)]
def lcm(a, b): return a * b // gcd(a, b)
def get_distance(x1, y1, x2, y2):
	  d = sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)
	  return d
def rotate(table):
   	  n_fild = []
   	  for x in zip(*table[::-1]):
   	  	  n_fild.append(x)
   	  return n_fild
sys.setrecursionlimit(10 ** 7)
INF = float('inf')
MOD = 10 ** 9 + 7
MOD2 = 998244353


def main():
   
   n, k = i_map()
   nums = prime_factorize(n)
   count = Counter(nums)
   
   ans = INF
   base = 0
   for i in range(n-1, 0, -1):
   	  lines = prime_factorize(i)
   	  score = 0
   	  new_nums = deepcopy(count)
   	  for j in range(len(lines)):
   	  	  if new_nums[lines[j]] > 0:
   	  	  	  score += 1
   	  	  	  new_nums[lines[j]] -= 1
   	  if score >= k:
   	  	  total = 1
   	  	  cou_line = Counter(lines)
   	  	  for key, value in cou_line.items():
   	  	  	  total *= (value+1)
   	  	  
   	  	  base = max(base, total)
   	  	  if base == total:
   	  	  	  ans = min(ans, i)
   print(ans)
   
   
if __name__ == '__main__':
    main()
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