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Given an array pref of prefix XORs where pref[i] = arr[0] ^ ... ^ arr[i], reconstruct the unique original array arr. Use the XOR cancellation property so arr[0]=pref[0] and for i>0 arr[i]=pref[i-1]^pref[i], yielding a linear-time solution.
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Leetcode 2433. Find The Original Array of Prefix Xor
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