I would like to address the similarity noticed in my solution.↵
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The core idea of the problem is to count subarrays with XOR = 0, which can be handled using prefix XOR where the condition becomes pref[r] = pref[l-1].↵
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For the array [1..n], the prefix XOR values follow a fixed repeating pattern depending on i mod 4. This greatly restricts the number of distinct states and introduces a clear periodic structure.↵
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Based on this, the approach is to:↵
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* group indices before x according to their prefix XOR,↵
* group indices from x onward similarly,↵
* and count valid pairs by matching equal XOR groups.↵
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Because of the periodic behavior, the solution boils down to evaluating only a small number of cases, leading to a direct formula based on counts of indices with specific mod 4 values.↵
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This approach is a natural consequence of the mathematical properties of the sequence and matches the general idea described in the editorial. As a result, independently derived solutions are likely to look very similar in logic and structure.↵
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I wrote my code independently during the contest without consulting any external material.↵
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Hence, any resemblance is due to the inherent nature of the problem rather than any form of collaboration.↵
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Submission: https://codeforces.me/contest/2225/submission/372032850↵
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I kindly request the Codeforces team to recheck my submission and review all my submissions in this contest. If possible, please reconsider the skipped/flagged status after verification.↵
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I fully respect the platform’s rules and would appreciate a fair review.
↵
The core idea of the problem is to count subarrays with XOR = 0, which can be handled using prefix XOR where the condition becomes pref[r] = pref[l-1].↵
↵
For the array [1..n], the prefix XOR values follow a fixed repeating pattern depending on i mod 4. This greatly restricts the number of distinct states and introduces a clear periodic structure.↵
↵
Based on this, the approach is to:↵
↵
* group indices before x according to their prefix XOR,↵
* group indices from x onward similarly,↵
* and count valid pairs by matching equal XOR groups.↵
↵
Because of the periodic behavior, the solution boils down to evaluating only a small number of cases, leading to a direct formula based on counts of indices with specific mod 4 values.↵
↵
This approach is a natural consequence of the mathematical properties of the sequence and matches the general idea described in the editorial. As a result, independently derived solutions are likely to look very similar in logic and structure.↵
↵
I wrote my code independently during the contest without consulting any external material.↵
↵
Hence, any resemblance is due to the inherent nature of the problem rather than any form of collaboration.↵
↵
Submission: https://codeforces.me/contest/2225/submission/372032850↵
↵
I kindly request the Codeforces team to recheck my submission and review all my submissions in this contest. If possible, please reconsider the skipped/flagged status after verification.↵
↵
I fully respect the platform’s rules and would appreciate a fair review.
