Data commit

Task/Count-the-coins/Python/count-the-coins-1.py

@@ -0,0 +1,10 @@
+def changes(amount, coins):
+    ways = [0] * (amount + 1)
+    ways[0] = 1
+    for coin in coins:
+        for j in xrange(coin, amount + 1):
+            ways[j] += ways[j - coin]
+    return ways[amount]
+
+print changes(100, [1, 5, 10, 25])
+print changes(100000, [1, 5, 10, 25, 50, 100])

Task/Count-the-coins/Python/count-the-coins-2.py

@@ -0,0 +1,38 @@
+try:
+    import psyco
+    psyco.full()
+except ImportError:
+    pass
+
+def count_changes(amount_cents, coins):
+    n = len(coins)
+    # max([]) instead of max() for Psyco
+    cycle = max([c+1 for c in coins if c <= amount_cents]) * n
+    table = [0] * cycle
+    for i in xrange(n):
+        table[i] = 1
+
+    pos = n
+    for s in xrange(1, amount_cents + 1):
+        for i in xrange(n):
+            if i == 0 and pos >= cycle:
+                pos = 0
+            if coins[i] <= s:
+                q = pos - coins[i] * n
+                table[pos]= table[q] if (q >= 0) else table[q + cycle]
+            if i:
+                table[pos] += table[pos - 1]
+            pos += 1
+    return table[pos - 1]
+
+def main():
+    us_coins = [100, 50, 25, 10, 5, 1]
+    eu_coins = [200, 100, 50, 20, 10, 5, 2, 1]
+
+    for coins in (us_coins, eu_coins):
+        print count_changes(     100, coins[2:])
+        print count_changes(  100000, coins)
+        print count_changes( 1000000, coins)
+        print count_changes(10000000, coins), "\n"
+
+main()