Fusion tree
Mantra in computer science is very complicated. A fusion tree is a tree data on w-bit integers. It uses O(n) space and performs searches in O(logw n) time, which is faster than the van Emde Boas tree . O(1) is the fastest (MSB). Sketching is the method by which each w-bit key at a node containing k keys is compressed into only k − 1 bits. The node X are 0,1,2・・・・,(n-1). This is expansion. O(n^2) The fusion tree must be able to search a node containing up to w^1/5 keys in constant time. There are many start points Xo. It includes (0,1) which is 2^(n-1) bits, but you can search it according to w and Xn. Therefore, you can find max() min(), and successor(x) predecessor(x). X(1) survive. The computer like copying. 1000000000100000000・・・・ 1000100000110000000・・・・ 1000010000111000000・・・・ 1000000100111100000・・・・ You want to know 100,110,111 for comparison. empty() is S=φ delete(x) is setting the bit for x to 0. There is the collapse. Each sketch bit in location...