SWE Interview preparation

https://leetcode.com/problems/find-median-from-data-stream/ Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two middle value. For example, [2,3,4] , the median is  3 [2,3] , the median is  (2 + 3) / 2 = 2.5 Design a data structure that supports the following two operations: void addNum(int num) - Add a integer number from the data stream to the data structure. double findMedian() - Return the median of all elements so far. Example: addNum(1) addNum(2) findMedian() -> 1.5 addNum(3) findMedian() -> 2 Follow up: If all integer numbers from the stream are between 0 and 100, how would you optimize it? If 99% of all integer numbers from the stream are between 0 and 100, how would you optimize it? ----

https://leetcode.com/problems/online-stock-span/ Write a class  StockSpanner  which collects daily price quotes for some stock, and returns the  span  of that stock's price for the current day. The span of the stock's price today is defined as the maximum number of consecutive days (starting from today and going backwards) for which the price of the stock was less than or equal to today's price. For example, if the price of a stock over the next 7 days were  [100, 80, 60, 70, 60, 75, 85] , then the stock spans would be  [1, 1, 1, 2, 1, 4, 6] . Example 1: Input: ["StockSpanner","next","next","next","next","next","next","next"] , [[],[100],[80],[60],[70],[60],[75],[85]] Output: [null,1,1,1,2,1,4,6] Explanation: First, S = StockSpanner() is initialized. Then: S.next(100) is called and returns 1, S.next(80) is called and returns 1, S.next(60) is called and returns 1, S.next(70) is...