Create single-row-keyboard.py

Author: kamyu104

Python/single-row-keyboard.py

@@ -0,0 +1,16 @@
+# Time:  O(n)
+# Space: O(1)
+
+class Solution(object):
+    def calculateTime(self, keyboard, word):
+        """
+        :type keyboard: str
+        :type word: str
+        :rtype: int
+        """
+        lookup = {c:i for i, c in enumerate(keyboard)}
+        result, prev = 0, 0
+        for c in word:
+            result += abs(lookup[c]-prev)
+            prev = lookup[c]
+        return result