coin change solution

Author: devyejin

coin-change/devyejin.py

@@ -0,0 +1,46 @@
+# # 중복조합
+# class Solution:
+#     def coinChange(self, coins: List[int], amount: int) -> int:
+#
+#         def backtrack(current, total):
+#             if total == amount:
+#                 return len(current)
+#
+#             if total > amount:
+#                 return float('inf')
+#
+#             min_count = float('inf')
+#             for coin in coins:
+#                 current.append(coin)
+#                 result = backtrack(current, total + coin)
+#                 min_count = min(min_count, result)
+#                 current.pop()
+#
+#             return min_count
+#
+#         ans = backtrack([], 0)
+#         return -1 if ans == float('inf') else ans
+from collections import deque
+from typing import List
+
+class Solution:
+    def coinChange(self, coins: List[int], amount: int) -> int:
+        if amount == 0:
+            return 0
+
+        queue = deque([(0, 0)])
+        visited = set([0])
+
+        while queue:
+            current_amount, count = queue.popleft()
+
+            for coin in coins:
+                new_amount = current_amount + coin
+                if new_amount == amount:
+                    return count + 1
+                if new_amount < amount and new_amount not in visited:
+                    visited.add(new_amount)
+                    queue.append((new_amount, count + 1))
+
+        return -1
+