Completed DP-2

Problem 22 - Paint House.py

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+# 256. Paint House
+
+# Time complexiety: O(3*n)
+# Space complexiety: O(1)
+
+class Solution:
+    def minCost(self, costs: List[List[int]]) -> int:
+        minCost = min(costs[0][0],costs[0][1],costs[0][2])
+
+        for i in range(1,len(costs)):
+            # RED
+            costs[i][0] = costs[i][0] + min(costs[i-1][1],costs[i-1][2])
+            # GREEN
+            costs[i][1] = costs[i][1] + min(costs[i-1][0],costs[i-1][2])
+            # BLUE
+            costs[i][2] = costs[i][2] + min(costs[i-1][0],costs[i-1][1])
+
+            minCost = min(costs[i][0],costs[i][1],costs[i][2])
+
+        return minCost

Problem 23 - Coin Change II.py

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+# 518. Coin Change II
+
+# Time Complexity: O(n*m)
+# Space Complexity: O(m)
+
+class Solution:
+    def change(self, amount: int, coins: List[int]) -> int:
+        if not coins:
+            return 0
+
+        n = len(coins)
+        dp = [0 for i in range(amount + 1)]
+
+        dp[0] = 1
+
+        for i in range(1, n + 1):
+            for j in range(amount + 1):
+                if j >= coins[i-1]:
+                    dp[j] = dp[j] + dp[j-coins[i-1]]
+
+        return dp[amount]