LeetCode题解(1679)：K和数对的最大数目(Python)

题目：​​原题链接​​（中等）

标签：哈希表

解法一：

class Solution:
    def maxOperations(self, nums: List[int], k: int) -> int:
        count = collections.Counter([num for num in nums if num < k])

        ans = count[0] // 2

        for n1 in count:
            if n1 * 2 == k:
                ans += count[n1] // 2
            else:
                if k - n1 in count:
                    ans += min(count[n1], count[k - n1])
                    count[n1] = 0

        return ans