結果
| 問題 |
No.437 cwwゲーム
|
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-03-20 18:39:58 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 65 ms / 2,000 ms |
| コード長 | 1,618 bytes |
| コンパイル時間 | 155 ms |
| コンパイル使用メモリ | 82,772 KB |
| 実行使用メモリ | 73,528 KB |
| 最終ジャッジ日時 | 2025-03-20 18:40:02 |
| 合計ジャッジ時間 | 3,573 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 41 |
ソースコード
import sys
from collections import defaultdict
n = input().strip()
s = list(n)
L = len(s)
if L < 3:
print(0)
sys.exit()
# Generate all possible valid triples (i, j, k) with i < j < k and forms a cww number
triples = []
for i in range(L):
for j in range(i+1, L):
for k in range(j+1, L):
a, b, c = s[i], s[j], s[k]
if a == b or b != c or a == '0':
continue
value = int(a + b + c)
triples.append((i, j, k, value))
if not triples:
print(0)
sys.exit()
full_mask = (1 << L) - 1
dp = [-sys.maxsize] * (1 << L)
dp[full_mask] = 0 # Initial state: all digits available, score 0
# Group masks by the number of set bits and process them in descending order
masks_by_bits = defaultdict(list)
for mask in range(1 << L):
cnt = bin(mask).count('1')
masks_by_bits[cnt].append(mask)
# Sort the keys in descending order to process masks with most bits first
sorted_bit_counts = sorted(masks_by_bits.keys(), reverse=True)
for bit_count in sorted_bit_counts:
for mask in masks_by_bits[bit_count]:
if dp[mask] == -sys.maxsize:
continue
# Check all valid triples
for i, j, k, val in triples:
if (mask & (1 << i)) and (mask & (1 << j)) and (mask & (1 << k)):
new_mask = mask ^ ((1 << i) | (1 << j) | (1 << k))
if dp[new_mask] < dp[mask] + val:
dp[new_mask] = dp[mask] + val
# The maximum score is the maximum value in dp, or 0 if no triples were chosen
max_score = max([x for x in dp if x != -sys.maxsize] + [0])
print(max_score)
lam6er