Create substring-matching-pattern.py

Author: kamyu104

Python/substring-matching-pattern.py

@@ -0,0 +1,44 @@
+# Time:  O(n + m)
+# Space: O(m)
+
+# kmp 
+class Solution(object):
+    def hasMatch(self, s, p):
+        """
+        :type s: str
+        :type p: str
+        :rtype: bool
+        """
+        def getPrefix(pattern):
+            prefix = [-1]*len(pattern)
+            j = -1
+            for i in xrange(1, len(pattern)):
+                while j+1 > 0 and pattern[j+1] != pattern[i]:
+                    j = prefix[j]
+                if pattern[j+1] == pattern[i]:
+                    j += 1
+                prefix[i] = j
+            return prefix
+
+        def KMP(text, pattern, i):
+            prefix = getPrefix(pattern)
+            j = -1
+            for i in xrange(i, len(text)):
+                while j+1 > 0 and pattern[j+1] != text[i]:
+                    j = prefix[j]
+                if pattern[j+1] == text[i]:
+                    j += 1
+                if j+1 == len(pattern):
+                    return i-j
+            return -1
+
+        i = 0
+        for x in p.split('*'):
+            if not x:
+                continue
+            i = KMP(s, x, i)
+            if i == -1:
+                return False
+            i += len(x)
+        return True
+