Split search method (Binary Search Method, half-lookup method)

Source: Internet
Author: User

The binary search method isSortedTo search


The time complexity of the algorithm. For a sequence with a length of N, execute n/2 at a time. Assume that K ends at the end of the first n/2 ^ K = 0, so K = logn

Time Complexity logn

 Int Binarysearch ( Const   Int Array [], Int X, Int  N ){  Int  Low, mid, high; low = 0 , High = N- 1  ;  While (Low <= High) {mid = (Low + high )/ 2  ;  If (Array [Mid] < X) low = Mid + 1  ;  Else   If (Array [Mid]> X) high = Mid- 1 ;  Else      Return  Mid ;}  Return - 1  ;} 


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