◼ 数组中的第K个最大元素:https://leetcode-cn.com/problems/kth-largest-element-in-an-array/
◼ 根据字符出现频率排序:https://leetcode-cn.com/problems/sort-characters-by-frequency/
◼ 数据流中的第K大元素:https://leetcode-cn.com/problems/kth-largest-element-in-a-stream/
◼ 有序矩阵中第K小的元素:https://leetcode-cn.com/problems/kth-smallest-element-in-a-sorted-matrix/
◼ 前K个高频元素:https://leetcode-cn.com/problems/top-k-frequent-elements/
◼ 前K个高频单词:https://leetcode-cn.com/problems/top-k-frequent-words/
◼ 查找和最小的K对数字:https://leetcode-cn.com/problems/find-k-pairs-with-smallest-sums/
◼ 合并K个排序链表:https://leetcode-cn.com/problems/merge-k-sorted-lists/
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