結果
| 問題 |
No.332 数列をプレゼントに
|
| コンテスト | |
| ユーザー |
qwewe
|
| 提出日時 | 2025-04-24 12:20:42 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
MLE
|
| 実行時間 | - |
| コード長 | 1,850 bytes |
| コンパイル時間 | 253 ms |
| コンパイル使用メモリ | 82,412 KB |
| 実行使用メモリ | 338,340 KB |
| 最終ジャッジ日時 | 2025-04-24 12:21:01 |
| 合計ジャッジ時間 | 4,543 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 5 |
| other | AC * 1 MLE * 1 -- * 40 |
ソースコード
import sys
from collections import defaultdict
def generate_subset_sums(arr, max_sum):
n = len(arr)
sums = defaultdict(list)
def backtrack(index, current_sum, mask):
if index == n:
sums[current_sum].append(mask)
return
# Include the current element
new_sum = current_sum + arr[index]
if new_sum <= max_sum:
backtrack(index + 1, new_sum, mask | (1 << index))
# Exclude the current element
backtrack(index + 1, current_sum, mask)
backtrack(0, 0, 0)
return sums
def main():
N, X = map(int, sys.stdin.readline().split())
A = list(map(int, sys.stdin.readline().split()))
B = []
B_indices = []
for i in range(N):
if A[i] <= X:
B.append(A[i])
B_indices.append(i)
sum_B = sum(B)
if sum_B < X:
print("No")
return
if sum_B == X:
s = ['x'] * N
for idx in B_indices:
s[idx] = 'o'
print(''.join(s))
return
diff = sum_B - X
m = len(B)
k = m // 2
first = B[:k]
second = B[k:]
first_sums = generate_subset_sums(first, diff)
second_sums = generate_subset_sums(second, diff)
found = False
mask_left = 0
mask_right = 0
for sum_left in first_sums:
sum_right = diff - sum_left
if sum_right in second_sums:
mask_left = first_sums[sum_left][0]
mask_right = second_sums[sum_right][0]
found = True
break
if not found:
print("No")
else:
total_mask = mask_left | (mask_right << len(first))
s = ['x'] * N
for j in range(m):
if not (total_mask & (1 << j)):
s[B_indices[j]] = 'o'
print(''.join(s))
if __name__ == "__main__":
main()
qwewe