Problems
# Q: check for balanced parenthesis
# Q: get all sub combination of list
# Q: get all english combinations for phone number
# Q: print fibonacci numbers
# Q: check special substring in string
# Q: how to define a class
# Q: sliding window returns sum of k elements
# Q: jumping numbers
# Q: fizzbuzz problem
# Q: print range when given sorted list of num
# Q: fibonacci with dynamic prog
# Q: x,y->x+y,y or x,y+x problem
# Q: max subarray sum contiguous kadane algo
# Q: longest palindrome substring manacher algo
# Q: simple binary search
# Q: tower of hanoi
# Q: location of a value in rotated array
# Q: Level Order Traversal (BFS/DFS)
# Q: Restaurant total bill using class
# Q: Person age using class
# Q: Inheritance person student
# Q: Linked List
# Q: Calculator class with exception
# Q: Binary Tree Insert Traverse InOrder LDR
# Q: coin change problem