1. Leetcode simple level questions. 2. The pass rate is 44.4%. A simulation question is given to an array. If the current element is the smallest in the queue, dequeue, if not, move to the end of the queue. 3. Find the longest descending subsequence for an array consisting of letters, and return the length and sequence. It seems that if the length is equal, it should be returned in lexicographic order. 4. Find the number of subsequences where the maximum value-minimum value <k for an array.
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