added 14

13.py

+# Write a function solve that returns the running sum of a list. 
+# The running sum is the sum of all elements up to each index.
+
 def solve(nums):
     result = [nums[0]]
     for i in range(1, len(nums)):

14.py

+# Write a function solve that reverses the words in a string. 
+# Words are separated by spaces.
+
+def solve(string):
+    list = reversed(string.split())
+    return ' '.join(list)
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