Q: Assume you have a number line starting from zero. You start from index "start", trying to reach index "end" by only performing operations "l" and "r" that signify the number of steps you can take towards left or right respectively. On the number line, there are some indexes marked which you cannot visit, let's mark them as "-1". For example, consider the input as below: arr = [0, 1, 2, 3, -1, 5, 6, 7, -1, 9, 10] start = 2 end = 5 l = 4 (No of steps you can take towards left) r = 3 (No of steps you can take towards the right) Find the operations you need to take to reach from start to end. in the form of ["L", "R", "R"] or ["L", "R", "L", "L"], etc.
