LCR 103. 零钱兑换

# 给定不同面额的硬币 coins 和一个总金额 amount。编写一个函数来计算可以凑成总金额所需的最少的硬币个数。如果没有任何一种硬币组合能组成总金额,返回
#  -1。
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#  你可以认为每种硬币的数量是无限的。
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#  示例 1:
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# 输入:coins = [1, 2, 5], amount = 11
# 输出:3
# 解释:11 = 5 + 5 + 1
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#  示例 2:
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# 输入:coins = [2], amount = 3
# 输出:-1
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#  示例 3:
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# 输入:coins = [1], amount = 0
# 输出:0
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#  示例 4:
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# 输入:coins = [1], amount = 1
# 输出:1
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#  示例 5:
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# 输入:coins = [1], amount = 2
# 输出:2
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#  提示:
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#  1 <= coins.length <= 12
#  1 <= coins[i] <= 2³¹ - 1
#  0 <= amount <= 10⁴
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#  注意:本题与主站 322 题相同: https://leetcode-cn.com/problems/coin-change/
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#  Related Topics 广度优先搜索 数组 动态规划 👍 94 👎 0
from typing import List


# leetcode submit region begin(Prohibit modification and deletion)
class Solution:
    def coinChange(self, coins: List[int], amount: int) -> int:
        dp = [float('inf')] * (amount + 1)
        dp[0] = 0
        for c in coins:
            for x in range(c, amount + 1):
                dp[x] = min(dp[x], dp[x - c] + 1)
        return dp[amount] if dp[amount] != float('inf') else -1


# leetcode submit region end(Prohibit modification and deletion)
print(Solution().coinChange([1, 2, 5], 11))

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