Spaces:
Running
Running
| USER: https://codeforces.com/problemset/problem/1592/E | |
| BOT: Thanks! Now could you provide a link to the editorial. | |
| USER: https://codeforces.com/blog/entry/95583 | |
| BOT: Would you like hints to help you solve the problem or an interactive explanation of the editorial (hint/editorial)? | |
| USER: hint | |
| BOT: What are you current thoughts on the problem? | |
| USER: I know the subarray length has to be even. I also think that I can iterate over the MSB of the bitwise AND, but i don't know how to check if the XOR has a larger bit set. Can I use a binary trie for this? | |
| BOT: Using a binary trie is not necessary for this problem. Instead, you can leverage the properties of the bitwise AND and XOR operations along with prefix arrays to solve it efficiently. | |
| ### Hint: | |
| Focus on creating a prefix array for the XOR values considering only the important bits. For each bit position $ k $, you need to find the minimum $ l $ such that the subarray $[l, r]$ satisfies the conditions mentioned, especially that the length is even and the XOR of the subarray is zero for the important bits. | |
| Would you like a more detailed hint on how to implement this approach? | |