You want to build n new buildings in a city. The new buildings will be built in a line and are labeled from 1 to n. However, there are city restrictions on the heights of the new buildings:

夏日炎炎，小男孩 Tony 想买一些雪糕消消暑。 商店中新到 n 支雪糕，用长度为 n 的数组 costs 表示雪糕的定价，其中 costs[i] 表示第 i 支雪糕的现金价格。Tony 一共有 coins 现金可以用于消费，他想要买尽可能多的雪糕。 注意：Tony 可以按任意顺序购买雪糕。 给你价格数组 costs 和现金量 coins ，请你计算并返回 Tony 用 coins 现金能够买到的雪糕的 最大数量 。 你必须使用计数排序解决此问题。   示例 1： 输入：costs = [1,3,2,4…

It is a sweltering summer day, and a boy wants to buy some ice cream bars. At the store, there are n ice cream bars. You are given an array costs of length n, where costs[i] is the price of the ith ice cream bar in coins. The boy initially has coins coins…

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.…

给你一个 正整数 数组 nums 。 你需要从数组中选出一个满足下述条件的子集：

You are given an array of positive integers nums. You need to select a subset of nums which satisfies the following condition:

给你一个正整数数组 arr 。请你对 arr 执行一些操作（也可以不进行任何操作），使得数组满足以下条件：

You are given an array of positive integers arr. Perform some operations (possibly none) on arr so that it satisfies these conditions:

给你一个字符串数组 patterns 和一个字符串 word ，统计 patterns 中有多少个字符串是 word 的子字符串。返回字符串数目。 子字符串 是字符串中的一个连续字符序列。   示例 1： 输入：patterns = ["a","abc","bc","d"], word = "abc" 输出：3 解释： - "a" 是 "abc" 的子字符串。 - "abc" 是 "abc" 的子字符串。 - "bc" 是 "abc" 的子字符串。 - "d" 不是 "abc" 的子字符串。 patterns…

Given an array of strings patterns and a string word, return the number of strings in patterns that exist as a substring in word. A substring is a contiguous sequence of characters within a string.   Example 1: Input: patterns = ["a","abc","bc","d"], word…

给你一个下标从 0 开始、大小为 n x n 的二维矩阵 grid ，其中 (r, c) 表示：

You are given a 0-indexed 2D matrix grid of size n x n, where (r, c) represents:

给你一个 m x n 的二进制矩形 grid 和一个整数 health 表示你的健康值。 你开始于矩形的左上角 (0, 0) ，你的目标是矩形的右下角 (m - 1, n - 1) 。 你可以在矩形中往上下左右相邻格子移动，但前提是你的健康值始终是 正数 。 对于格子 (i, j) ，如果 grid[i][j] = 1 ，那么这个格子视为 不安全 的，会使你的健康值减少 1 。 如果你可以到达最终的格子，请你返回 true ，否则返回 false 。 注意 ，当你在最终格子的时候，你的健康值也必须为 正数 。…