Merge pull request #744 from ask2sm/patch-14

robbinkarpstringmatching.py

Author: probot-auto-merge[bot]

Strings/robbinkarpstringmatching.py

@@ -0,0 +1,28 @@
+import math
+d = 256
+def search(pat, txt, q): 
+	M = len(pat) 
+	N = len(txt) 
+	p = 0 
+	t = 0 
+	h = pow(d,M-1)%q
+	for i in range(M): 
+		p = (d*p + ord(pat[i]))%q 
+		t = (d*t + ord(txt[i]))%q 
+	for i in range(N-M+1): 
+		if p==t: 
+			for j in range(M): 
+				if txt[i+j] != pat[j]: 
+					break
+
+			j+=1
+			if j==M: 
+				print ("Pattern found at index " ,i)
+		if i < N-M: 
+			t = (d*(t-ord(txt[i])*h) + ord(txt[i+M]))%q 
+			if t < 0: 
+				t = t+q 
+txt = "Sourav Mondal SM"
+pat = "SM"
+q = 101 
+search(pat,txt,q)