結果
| 問題 |
No.1045 直方体大学
|
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-04-15 23:38:12 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 887 ms / 2,000 ms |
| コード長 | 1,955 bytes |
| コンパイル時間 | 165 ms |
| コンパイル使用メモリ | 82,136 KB |
| 実行使用メモリ | 194,644 KB |
| 最終ジャッジ日時 | 2025-04-15 23:39:27 |
| 合計ジャッジ時間 | 5,198 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 17 |
ソースコード
from collections import deque
n = int(input())
prisms = []
for _ in range(n):
a, b, c = map(int, input().split())
bases = []
# Generate all three possible base pairs (sorted) and their heights
x, y = max(a, b), min(a, b)
bases.append((x, y, c))
x, y = max(a, c), min(a, c)
bases.append((x, y, b))
x, y = max(b, c), min(b, c)
bases.append((x, y, a))
prisms.append(bases)
# DP array: each mask maps to a dictionary of (max_dim, min_dim) -> max_height
dp = [{} for _ in range(1 << n)]
queue = deque()
max_height = 0
# Initialize with each possible starting state (single prism)
for i in range(n):
for base in prisms[i]:
max_p, min_p, h = base
mask = 1 << i
key = (max_p, min_p)
if key not in dp[mask] or dp[mask][key] < h:
dp[mask][key] = h
queue.append((mask, max_p, min_p, h))
if h > max_height:
max_height = h
# Process each state in the queue
while queue:
mask, curr_max, curr_min, height = queue.popleft()
# Update the global maximum height
if height > max_height:
max_height = height
# Try adding each possible next prism
for j in range(n):
if not (mask & (1 << j)):
# Prism j is not used yet
for base in prisms[j]:
new_max, new_min, new_h = base
if new_max <= curr_max and new_min <= curr_min:
new_mask = mask | (1 << j)
total_h = height + new_h
key = (new_max, new_min)
# Check if this state is better than existing
if key not in dp[new_mask] or dp[new_mask].get(key, 0) < total_h:
dp[new_mask][key] = total_h
queue.append((new_mask, new_max, new_min, total_h))
if total_h > max_height:
max_height = total_h
print(max_height)
lam6er