Use k-way merging +1. 1. Before the merging start, sorting these lists according to the first element of each list. // O(k log k) 2. So the first element in the first list is the smallest element. Put the smallest into the result array. // O(1) 3. Then, using binary search to find the new position of the first list // O(k) 4. These lists are still sorted, so the first element in the first list is still smallest. Just repeat the step 2, 3 n times.
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