golang如何实现插值搜索？

问题内容

golang如何实现插值搜索？

正确答案

package main
import "fmt"

func interpolationSearch(array []int, key int) int {

	min, max := array[0], array[len(array)-1]

	low, high := 0, len(array)-1

	for {
		if key < min {
			return low
		}

		if key > max {
			return high + 1
		}

		// 猜测一个位置
		var guess int
		if high == low {
			guess = high
		} else {
			size := high - low
			offset := int(float64(size-1) * (float64(key-min) / float64(max-min)))
			guess = low + offset
		}

		// 是否找到?
		if array[guess] == key {
			// 扫描后面的
			for guess > 0 && array[guess-1] == key {
				guess--
			}
			return guess
		}

		// 判断高还是低
		if array[guess] > key {
			high = guess - 1
			max = array[high]
		} else {
			low = guess + 1
			min = array[low]
		}
	}
}


func main(){
	items := []int{1,2, 9, 20, 31, 45, 63, 70, 100}
	fmt.Println(interpolationSearch(items,63))
}