Add solutions for problem 31

Python/p030.py

@@ -1,7 +1,5 @@
 #!/usr/bin/python3
 
-from numpy import zeros
-
 from timeit import default_timer
 
 def main():

Python/p031.py

@@ -0,0 +1,33 @@
+#!/usr/bin/python3
+
+from timeit import default_timer
+
+def count(coins, value, n, i):
+    for j in range(i, 8):
+        value = value + coins[j]
+        if value == 200:
+            return n + 1
+        elif value > 200:
+            return n
+        else:
+            n = count(coins, value, n, j)
+            value = value - coins[j]
+
+    return n
+
+def main():
+    start = default_timer()
+
+    coins = [1, 2, 5, 10, 20, 50, 100, 200]
+
+    n = count(coins, 0, 0, 0)
+
+    end = default_timer()
+
+    print('Project Euler, Problem 30')
+    print('Answer: {}'.format(n))
+
+    print('Elapsed time: {:.9f} seconds'.format(end - start))
+
+if __name__ == '__main__':
+    main()