Given an m x n binary matrix mat, return the number of submatrices that have all ones.   Example 1: Input: mat = [[1,0,1],[1,1,0],[1,1,0]] Output: 13 Explanation: There are 6 rectangles of side 1x1. There are 2 rectangles of side 1x2. There are 3 rectangles…

给你一个整数数组 nums 。请你对数组执行下述操作：

You are given an array of integers nums. Perform the following steps:

给你一个整数数组 target 和一个数组 initial ，initial 数组与 target  数组有同样的维度，且一开始全部为 0 。 请你返回从 initial 得到  target 的最少操作次数，每次操作需遵循以下规则：

You are given an integer array target. You have an integer array initial of the same size as target with all elements initially zeros. In one operation you can choose any subarray from initial and increment each value by one. Return the minimum number of…

给你一个大小为 n 的 非负 整数数组 nums 。你的任务是对该数组执行若干次（可能为 0 次）操作，使得 所有 元素都变为 0。 在一次操作中，你可以选择一个子数组 [i, j]（其中 0 <= i <= j < n），将该子数组中所有 最小的非负整数 的设为 0。 返回使整个数组变为 0 所需的最少操作次数。

You are given an array nums of size n, consisting of non-negative integers. Your task is to apply some (possibly zero) operations on the array so that all elements become 0. In one operation, you can select a subarray [i, j] (where 0 <= i <= j < n) and set…

在一条无限长的公路上有 n 辆汽车正在行驶。汽车按从左到右的顺序按从 0 到 n - 1 编号，每辆车都在一个 独特的 位置。 给你一个下标从 0 开始的字符串 directions ，长度为 n 。directions[i] 可以是 'L'、'R' 或 'S' 分别表示第 i 辆车是向 左 、向 右 或者 停留 在当前位置。每辆车移动时 速度相同 。 碰撞次数可以按下述方式计算：

There are n cars on an infinitely long road. The cars are numbered from 0 to n - 1 from left to right and each car is present at a unique point. You are given a 0-indexed string directions of length n. directions[i] can be either 'L', 'R', or 'S' denoting…