In a mystic dungeon, n magicians are standing in a line. Each magician has an attribute that gives you energy. Some magicians can give you negative energy, which means taking energy from you. You have been cursed in such a way that after absorbing energy…

给你一个整数数组 nums 和两个整数 k 和 numOperations 。 你必须对 nums 执行 操作  numOperations 次。每次操作中，你可以：

You are given an integer array nums and two integers k and numOperations. You must perform an operation numOperations times on nums, where in each operation you:

给你一个整数数组 nums 和两个整数 k 和 numOperations 。 你必须对 nums 执行 操作  numOperations 次。每次操作中，你可以：

You are given an integer array nums and two integers k and numOperations. You must perform an operation numOperations times on nums, where in each operation you:

给你一个整数数组 nums 。 开始时，选择一个满足 nums[curr] == 0 的起始位置 curr ，并选择一个移动 方向 ：向左或者向右。 此后，你需要重复下面的过程：

You are given an integer array nums. Start by selecting a starting position curr such that nums[curr] == 0, and choose a movement direction of either left or right. After that, you repeat the following process:

给你一个下标从 0 开始长度为 n 的整数数组 stations ，其中 stations[i] 表示第 i 座城市的供电站数目。 每个供电站可以在一定 范围 内给所有城市提供电力。换句话说，如果给定的范围是 r ，在城市 i 处的供电站可以给所有满足 |i - j| <= r 且 0 <= i, j <= n - 1 的城市 j 供电。

You are given a 0-indexed integer array stations of length n, where stations[i] represents the number of power stations in the ith city. Each power station can provide power to every city in a fixed range. In other words, if the range is denoted by r, then…

给你一个正整数 n ，表示最初有一个 n x n 、下标从 0 开始的整数矩阵 mat ，矩阵中填满了 0 。 另给你一个二维整数数组 query 。针对每个查询 query[i] = [row1i, col1i, row2i, col2i] ，请你执行下述操作：

You are given a positive integer n, indicating that we initially have an n x n 0-indexed integer matrix mat filled with zeroes. You are also given a 2D integer array query. For each query[i] = [row1i, col1i, row2i, col2i], you should do the following operation:

给你一个字符串 s ，返回 s 中 长度为 3 的不同回文子序列 的个数。 即便存在多种方法来构建相同的子序列，但相同的子序列只计数一次。 回文 是正着读和反着读一样的字符串。 子序列 是由原字符串删除其中部分字符（也可以不删除）且不改变剩余字符之间相对顺序形成的一个新字符串。

Given a string s, return the number of unique palindromes of length three that are a subsequence of s. Note that even if there are multiple ways to obtain the same subsequence, it is still only counted once. A palindrome is a string that reads the same forwards…