请你实现三个 API append，addAll 和 multAll 来实现奇妙序列。 请实现 Fancy 类 ：

Write an API that generates fancy sequences using the append, addAll, and multAll operations. Implement the Fancy class:

有一条无限长的数轴，原点在 0 处，沿着 x 轴 正 方向无限延伸。 给你一个二维数组 queries ，它包含两种操作：

There exists an infinite number line, with its origin at 0 and extending towards the positive x-axis. You are given a 2D array queries, which contains two types of queries:

给你一个长度为 n 的整数数组 nums 和一个整数 k。

You are given an integer array nums of length n and an integer k. You must select exactly k distinct non-empty subarrays nums[l..r] of nums. Subarrays may overlap, but the exact same subarray (same l and r) cannot be chosen more than once. The value of a…

给你一个整数数组 nums 和一个整数 target。

You are given an integer array nums and an integer target. Return the number of subarrays of nums in which target is the majority element. The majority element of a subarray is the element that appears strictly more than half of the times in that subarray.…

给你一个整数数组 nums 和一个整数 target。

You are given an integer array nums and an integer target. Return the number of subarrays of nums in which target is the majority element. The majority element of a subarray is the element that appears strictly more than half of the times in that subarray.…