p30

Author: Xuefeng-Zhu

29-run-length.py

@@ -1,16 +1,13 @@
-def RunLength(strV): 
+def RunLength(str): 
   mark = 0
   result = ""
-  for i in range(1,len(strV)):
-    if strV[i-1] != strV[i]:
-      result += str(i-mark)+strV[mark]
+  for i in range(1,len(str)+1):
+    if i==len(str) or str[i-1] != str[i]:
+      result += "%d%s" %(i-mark,str[mark])
       mark = i
   return result
 
 
 # keep this function call here  
 # to see how to enter arguments in Python scroll down
-print RunLength(raw_input())  
-
-
-
+print RunLength(raw_input())           

30-prime-move.py

@@ -0,0 +1,19 @@
+def is_Prime(n):
+	for i in xrange(3, int(n ** 0.5)+1, 2):
+		if n % i == 0:
+			return False
+	return True
+	
+def PrimeMover(num): 
+	count = 1 
+	i = 1
+	while count < num:
+		i += 2
+		if is_Prime(i):
+			count += 1
+	return i
+
+
+# keep this function call here  
+# to see how to enter arguments in Python scroll down
+print PrimeMover(raw_input())