Added naive string search algorithm (#715)

Author: Reshad-Hasan

strings/naiveStringSearch.py

@@ -0,0 +1,29 @@
+"""
+this algorithm tries to find the pattern from every position of
+the mainString if pattern is found from position i it add it to
+the answer and does the same for position i+1
+
+Complexity : O(n*m)
+    n=length of main string
+    m=length of pattern string
+"""
+def naivePatternSearch(mainString,pattern):
+    patLen=len(pattern)
+    strLen=len(mainString)
+    position=[]
+    for i in range(strLen-patLen+1):
+        match_found=True
+        for j in range(patLen):
+            if mainString[i+j]!=pattern[j]:
+                match_found=False
+                break
+        if match_found:
+            position.append(i)
+    return position
+
+mainString="ABAAABCDBBABCDDEBCABC"
+pattern="ABC"
+position=naivePatternSearch(mainString,pattern)
+print("Pattern found in position ")
+for x in position:
+    print(x)