From 6cf16d847dd5a597e16101534baa0a7b30dc69d1 Mon Sep 17 00:00:00 2001
From: SitiNur <siti.nurhasanah9292@gmail.com>
Date: Mon, 15 Dec 2014 13:54:26 +0700
Subject: [PATCH] InterpolationSearch

---
 InterpolationSearch.go | 114 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 InterpolationSearch.go

diff --git a/InterpolationSearch.go b/InterpolationSearch.go
new file mode 100644
index 0000000..85da88d
--- /dev/null
+++ b/InterpolationSearch.go
@@ -0,0 +1,114 @@
+package main
+
+import "fmt"
+
+type Interface interface{
+	Len() int
+	More(i int, j interface{}) bool
+	Less(i int, j interface{}) bool
+	Integerize(i int) int
+	Convert(a interface{}) int
+}
+
+type arrInt []int
+func (f arrInt) Len() int { return len(f) }
+func (f arrInt) More(i int, j interface{}) bool { return f[i] > j.(int) }
+func (f arrInt) Less(i int, j interface{}) bool { return f[i] < j.(int) }
+func (f arrInt) Integerize(i int) int { return f[i] }
+func (f arrInt) Convert(a interface{}) int { return a.(int) }
+
+type arrString []string
+func (f arrString) Len() int { return len(f) }
+func (f arrString) More(i int,j interface{}) bool {return f[i] > j.(string) }
+func (f arrString) Less(i int,j interface{}) bool {return f[i] < j.(string) }
+func (f arrString) Integerize(i int) int {
+	if (f[i][0] >= 'a') && (f[i][0] <= 'z') {
+		return int(f[i][0])-'a'
+	} else if (f[i][0] >= 'A') && (f[i][0] <= 'Z') {
+		return int(f[i][0])-'A'
+	} else {
+		return int(f[i][0])
+	}
+}
+func (f arrString) Convert(a interface{}) int {
+	s := a.(string)
+	if (s[0] >= 'a') && (s[0] <= 'z') {
+		return int(s[0])-'a'
+	} else if (s[0] >= 'A') && (s[0] <= 'Z') {
+		return int(s[0])-'A'
+	} else {
+		return int(s[0])
+	}
+}
+
+//O(log log n)	
+func InterpolationSearch(a Interface, search interface{}) int {
+	low := 0
+	high := a.Len() - 1
+	for low <= high {
+		mid := low + (high - low) * ((a.Convert(search) - a.Integerize(low)) / (a.Integerize(high) - a.Integerize(low)))
+		if  a.More(mid,search) {
+			high = mid - 1
+		} else if a.Less(mid,search) {
+			low = mid + 1
+		} else {
+		return mid+1
+		}
+	}
+	return -1
+}
+
+func main(){
+
+	a := make(arrInt, 10)
+	for i:=0; i<10; i++ {
+		a[i] = i+1
+	}
+
+	fmt.Println("Data :", a)
+	var search int
+	search = 3
+	fmt.Println("Nilai yang ingin dicari :", search)
+	pos := InterpolationSearch(a, search)
+	if pos == -1 {
+		fmt.Println(search, "tidak ditemukan")
+	} else {
+		fmt.Println(search, "ada di urutan ke", pos)
+	}
+
+	s := make(arrString,5)
+	s[0] = "bangun"
+	s[1] = "duduk"
+	s[2] = "makan"
+	s[3] = "minum"
+	s[4] = "tidur"
+	fmt.Println("Data :", s)
+	fmt.Println("kata yang ingin dicari : bangun")
+	pos = InterpolationSearch(s, "bangun")
+	if pos == -1 {
+		fmt.Println("tidak ditemukan")
+	} else {
+		fmt.Println("ada di urutan ke", pos)
+	}
+	fmt.Println("kata yang ingin dicari : minum")
+	pos = InterpolationSearch(s, "minum")
+	if pos == -1 {
+		fmt.Println("tidak ditemukan")
+	} else {
+		fmt.Println("ada di urutan ke", pos)
+	}
+	fmt.Println("kata yang ingin dicari : tidur")
+	pos = InterpolationSearch(s, "tidur")
+	if pos == -1 {
+		fmt.Println("tidak ditemukan")
+	} else {
+		fmt.Println("ada di urutan ke", pos)
+	}
+	fmt.Println("kata yang ingin dicari : berdiri")
+	pos = InterpolationSearch(s, "berdiri")
+	if pos == -1 {
+		fmt.Println("tidak ditemukan")
+	} else {
+		fmt.Println("ada di urutan ke", pos)
+	}
+}