結果
| 問題 |
No.1240 Or Sum of Xor Pair
|
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-04-15 23:34:45 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 1,854 bytes |
| コンパイル時間 | 231 ms |
| コンパイル使用メモリ | 82,076 KB |
| 実行使用メモリ | 286,284 KB |
| 最終ジャッジ日時 | 2025-04-15 23:35:52 |
| 合計ジャッジ時間 | 10,004 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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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', 'cnt']
def __init__(self):
self.children = [None, None]
self.cnt = 0
def compute_pairs(arr, x):
root = TrieNode()
total = 0
for a in arr:
current_count = 0
stack = [(root, 17, True)]
while stack:
node, bit, is_tight = stack.pop()
if bit < 0:
continue
a_bit = (a >> bit) & 1
x_bit = (x >> bit) & 1
for child_bit in [0, 1]:
child = node.children[child_bit]
if not child:
continue
xor_bit = a_bit ^ child_bit
if is_tight:
if xor_bit < x_bit:
current_count += child.cnt
elif xor_bit == x_bit:
stack.append((child, bit - 1, True))
else:
current_count += child.cnt
total += current_count
current = root
for i in reversed(range(18)):
b = (a >> i) & 1
if not current.children[b]:
current.children[b] = TrieNode()
current = current.children[b]
current.cnt += 1
return total
def main():
import sys
input = sys.stdin.read().split()
ptr = 0
N = int(input[ptr])
ptr += 1
X = int(input[ptr])
ptr += 1
A = list(map(int, input[ptr:ptr + N]))
ptr += N
total_valid = compute_pairs(A, X)
bits = []
for k in range(18):
mask = 1 << k
B = [a for a in A if (a & mask) == 0]
bits.append(B)
ans = 0
for k in range(18):
B_k = bits[k]
cnt_k = compute_pairs(B_k, X)
contribution = (total_valid - cnt_k) * (1 << k)
ans += contribution
print(ans)
if __name__ == "__main__":
main()
lam6er