Along a long library corridor, there is a line of seats and decorative plants. You are given a 0-indexed string corridor of length n consisting of letters 'S' and 'P' where each 'S' represents a seat and each 'P' represents a plant. One room divider has already…

给你一个整数数组 prices ，表示一支股票的历史每日股价，其中 prices[i] 是这支股票第 i 天的价格。 一个 平滑下降的阶段 定义为：对于 连续一天或者多天 ，每日股价都比 前一日股价恰好少 1 ，这个阶段第一天的股价没有限制。 请你返回 平滑下降阶段 的数目。   示例 1： 输入：prices = [3,2,1,4] 输出：7 解释：总共有 7 个平滑下降阶段： [3], [2], [1], [4], [3,2], [2,1] 和 [3,2,1] 注意，仅一天按照定义也是平滑下降阶段。…

You are given an integer array prices representing the daily price history of a stock, where prices[i] is the stock price on the ith day. A smooth descent period of a stock consists of one or more contiguous days such that the price on each day is lower than…