coin change problem

Author: Alagappan Maruthappan

coin_change.py

@@ -0,0 +1,22 @@
+# https://leetcode.com/problems/coin-change/description/
+
+
+class Solution:
+    def coinChange(self, coins, amount):
+        """
+        :type coins: List[int]
+        :type amount: int
+        :rtype: int
+        """
+        if amount == 0:
+            return 0
+        DP = [amount + 1] * (amount + 1)
+        DP[0] = 0
+        for i in range(1, amount + 1):
+            for coin in coins:
+                if coin <= i:
+                    DP[i] = min(DP[i], DP[i-coin] + 1)
+        return DP[amount] if DP[amount] != amount + 1 else -1
+
+
+assert Solution().coinChange([1, 2, 5], 11) == 3