求出现最多的数：
　　给定n个数，已按从大到小顺序排列好，一共有q个询问，每次询问一个区间，问这个区间中出现次数最多的数是什么。(Find the most of the number:
Given the number of N, it has been arranged in order from big to small. There are Q queries, asking for an interval each time, and ask what the most frequent number is in this interval.)