wagner-fisher & werner algorithms working

werner.go

@@ -0,0 +1,45 @@
+package editdistance
+
+import (
+	"strings"
+)
+
+func Werner(a, b string) int {
+
+	phrase_a := strings.Fields(a)
+	phrase_b := strings.Fields(b)
+
+	m := len(phrase_a) + 1
+	n := len(phrase_b) + 1
+	distances := make([][]int, n)
+	for i := range distances {
+		distances[i] = make([]int, m)
+	}
+	// make the inital numbers on the top
+	for i := 1; i < n; i++ {
+		distances[i][0] = i
+	}
+	// make the inital numbers on the left side
+	for i := 1; i < m; i++ {
+		distances[0][i] = i
+	}
+
+	for i := 1; i < n; i++ {
+		for j := 1; j < m; j++ {
+			subCost := 0
+			if strings.EqualFold(phrase_a[j-1], phrase_b[i-1]) {
+				subCost = 0
+			} else {
+				subCost = 1
+			}
+			value := min(
+				distances[i-1][j]+1,
+				distances[i][j-1]+1,
+				distances[i-1][j-1]+subCost,
+			)
+			distances[i][j] = value
+		}
+	}
+
+	return distances[n-1][m-1]
+}