Merge pull request #746 from ask2sm/patch-17

kmpstringmatching.py

Author: probot-auto-merge[bot]

Strings/kmpstringmatching.py

@@ -0,0 +1,39 @@
+def KMPSearch(pat, txt): 
+	M = len(pat) 
+	N = len(txt) 
+	lps = [0]*M 
+	j = 0 
+	computeLPSArray(pat, M, lps) 
+
+	i = 0 
+	while i < N: 
+		if pat[j] == txt[i]: 
+			i += 1
+			j += 1
+
+		if j == M: 
+			print ("Found pattern at index " ,(i-j))
+			j = lps[j-1] 
+		elif i < N and pat[j] != txt[i]: 
+			if j != 0: 
+				j = lps[j-1] 
+			else: 
+				i += 1
+def computeLPSArray(pat, M, lps): 
+	len = 0 
+	lps[0] =0
+	i = 1
+	while i < M: 
+		if pat[i]== pat[len]: 
+			len += 1
+			lps[i] = len
+			i += 1
+		else: 
+			if len != 0: 
+				len = lps[len-1] 
+			else: 
+				lps[i] = 0
+				i += 1
+txt = "ABABDABACDABABCABAB"
+pat = "ABABCABAB"
+KMPSearch(pat, txt)