Can someone explain me the detailed method about how to use tries and binary search to solve this problem.
Can someone explain me the detailed method about how to use tries and binary search to solve this problem.
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Let's solve another problem: you are given an array, for each pair of indexes you compute a[j] ^ a[i] and you need to find the k-th element among computed values. You can find the solution here, problem F.
How, how to solve our problem? Let's compute auxiliary array b. b[j] = a[0] ^ a[1] ^ ... ^ a[j]. Notice that now we need to solve previous problem