結果
| 問題 |
No.1240 Or Sum of Xor Pair
|
| コンテスト | |
| ユーザー |
gew1fw
|
| 提出日時 | 2025-06-12 18:25:04 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 1,888 bytes |
| コンパイル時間 | 479 ms |
| コンパイル使用メモリ | 82,044 KB |
| 実行使用メモリ | 281,920 KB |
| 最終ジャッジ日時 | 2025-06-12 18:26:10 |
| 合計ジャッジ時間 | 10,657 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 12 TLE * 1 -- * 17 |
ソースコード
class TrieNode:
__slots__ = ['children', 'count']
def __init__(self):
self.children = [None, None]
self.count = 0
def insert_trie(root, num):
node = root
for bit in reversed(range(18)): # Process from MSB to LSB (17 to 0)
b = (num >> bit) & 1
if not node.children[b]:
node.children[b] = TrieNode()
node = node.children[b]
node.count += 1
def query_trie(root, a, X):
res = 0
node = root
for bit in reversed(range(18)):
if not node:
break
a_bit = (a >> bit) & 1
x_bit = (X >> bit) & 1
desired_trie_bit = a_bit ^ x_bit
other_trie_bit = 1 - desired_trie_bit
other_xor_bit = a_bit ^ other_trie_bit
if other_xor_bit < x_bit:
if node.children[other_trie_bit]:
res += node.children[other_trie_bit].count
if node.children[desired_trie_bit]:
node = node.children[desired_trie_bit]
else:
node = None
return res
def main():
import sys
input = sys.stdin.read().split()
idx = 0
N = int(input[idx])
idx += 1
X = int(input[idx])
idx += 1
A = list(map(int, input[idx:idx+N]))
idx += N
# Compute T: total valid pairs
root = TrieNode()
T = 0
for num in A:
T += query_trie(root, num, X)
insert_trie(root, num)
sum_total = 0
for b in range(18):
# Filter elements where bit b is not set
filtered = [num for num in A if (num & (1 << b)) == 0]
# Compute T_b for this filtered array
root_b = TrieNode()
T_b = 0
for num in filtered:
T_b += query_trie(root_b, num, X)
insert_trie(root_b, num)
contribution = (T - T_b) * (1 << b)
sum_total += contribution
print(sum_total)
if __name__ == "__main__":
main()
gew1fw