1. Given an array, reverse the order of its elements in place.

2. 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. For example: addNum(1) addNum(2) findMedian() -> 1.5 addNum(3) findMedian() -> 2

3. Write a command to find the lines containing the word "ERROR" from a log file and copy them to a new file.

4. What is a malloc function, where is it used, and how does it differ from new?

5. Write a function to determine if two stacks are equal. The function should return true if the stacks contain the same elements in the same order, and false otherwise.