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The Number of the Same BST
Description ![]() It is a binary search tree. And it can be built by inserting the elements of vector A <12, 6, 3, 18, 20, 10, 4, 17, 20> sequentially. But it can also be built by the vector B <12, 18, 17, 6, 20, 3, 10, 4, 20>. Now given a vector X, then you may get a binary search tree from X. Your job is to calculate how many different vectors can build the same binary search tree. To make it easy, you should just output the number of different vectors mod 9901. Input Output Sample Input Sample Output Source |
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