結果

問題 No.2180 Comprehensive Line Segments
ユーザー MasKoaTSMasKoaTS
提出日時 2022-12-17 16:08:59
言語 PyPy3
(7.3.15)
結果
WA  
(最新)
AC  
(最初)
実行時間 -
コード長 2,344 bytes
コンパイル時間 440 ms
コンパイル使用メモリ 87,280 KB
実行使用メモリ 89,640 KB
最終ジャッジ日時 2023-08-21 05:54:56
合計ジャッジ時間 11,665 ms
ジャッジサーバーID
(参考情報)
judge13 / judge14
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 109 ms
77,540 KB
testcase_01 AC 74 ms
71,224 KB
testcase_02 AC 70 ms
71,396 KB
testcase_03 AC 649 ms
87,396 KB
testcase_04 AC 71 ms
71,452 KB
testcase_05 AC 70 ms
71,456 KB
testcase_06 AC 70 ms
71,628 KB
testcase_07 AC 71 ms
71,476 KB
testcase_08 AC 75 ms
71,500 KB
testcase_09 AC 566 ms
86,572 KB
testcase_10 AC 778 ms
88,612 KB
testcase_11 AC 856 ms
89,032 KB
testcase_12 AC 309 ms
82,700 KB
testcase_13 AC 718 ms
87,372 KB
testcase_14 AC 872 ms
88,908 KB
testcase_15 AC 738 ms
88,648 KB
testcase_16 AC 155 ms
78,780 KB
testcase_17 AC 193 ms
80,000 KB
testcase_18 AC 778 ms
87,640 KB
testcase_19 AC 297 ms
81,784 KB
testcase_20 AC 83 ms
76,492 KB
testcase_21 AC 194 ms
80,184 KB
testcase_22 AC 108 ms
77,516 KB
testcase_23 AC 144 ms
78,444 KB
testcase_24 AC 120 ms
77,776 KB
testcase_25 AC 156 ms
78,964 KB
testcase_26 WA -
testcase_27 WA -
testcase_28 AC 338 ms
82,572 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 #

from __future__ import annotations
import sys
from itertools import permutations
input = sys.stdin.readline


class Vector2:
	def __init__(self, x, y):
		self.x = x
		self.y = y

	def __str__(self):
		return str((self.x, self.y))

	__repr__ = __str__

	def __eq__(self, other):
		return (self.x == other.x and self.y == other.y)

	def __hash__(self):
		return hash((self.x, self.y))

	def __add__(self, other):
		return Vector2(self.x + other.x, self.y + other.y)

	def __sub__(self, other):
		return Vector2(self.x - other.x, self.y - other.y)

	def __mul__(self, other):
		return self.x * other.y - self.y * other.x

	def normalize(self) -> Vector2:
		assert(self.x != 0 or self.y != 0)
		norm = self.x ** 2 + self.y ** 2
		self.x *= abs(self.x) / norm
		self.y *= abs(self.y) / norm
		return self


def sgn(x: int) -> int:
	if(x > 0):
		return 1
	if(x < 0):
		return -1
	return 0

def same_inclination(v1: Vector2, v2: Vector2) -> bool:
	return (v1 * v2 == 0 and (v1.x * v2.x > 0 or v1.y * v2.y > 0))


"""
Main Code
"""

N = int(input())
P = [Vector2(*map(int, input().split())) for _ in [0] * N]

if(N == 1):
	print(1)
	exit(0)

perm = [*permutations([*range(N)], 2)]
vec_lis = [[None]*N for _ in [0]*N]
for i, j in perm:
	vec_lis[i][j] = P[j] - P[i]

ans = N
dp = [[[N]*N for _ in [0]*N] for _ in [0]*(1 << N)]
for i, j in perm:
	dp[(1 << i) | (1 << j)][i][j] = 1

goal = (1 << N) - 1
for b_now in range(3, goal):
	for v_prev, v_now in perm:
		if(dp[b_now][v_prev][v_now] == N or not((b_now >> v_prev) & 1) or not((b_now >> v_now) & 1)):
			continue
		c_next = c_now = dp[b_now][v_prev][v_now]
		v1 = vec_lis[v_prev][v_now]
		for v_next1, v_next2 in perm:
			if((((b_now >> v_next1) & 1) and v_now != v_next1) or ((b_now >> v_next2) & 1)):
				continue
			b_next = b_now | (1 << v_next1) | (1 << v_next2)
			v2, v3 = vec_lis[v_now][v_next1], vec_lis[v_next1][v_next2]
			if(v_now == v_next1):
				c_next = c_now + 1 - same_inclination(v1, v3)
			else:
				d = same_inclination(v1, v2) + same_inclination(v2, v3)
				if(d == 0):
					d = (sgn(v1 * v2) == sgn(v2 * v3) == sgn(v1 * v3))
				c_next = c_now + 2 - d
			# print(b_now, b_next, v_prev, v_now, v_next1, v_next2, c_now, c_next)
			if(dp[b_next][v_next1][v_next2] <= c_next):
				continue
			dp[b_next][v_next1][v_next2] = c_next

ans = min(min(lis) for lis in dp[goal])
print(ans)
0