Branch & bound based question no.of ways to buy exactly one pair of jeans, skirt, shirt, short. Find if infinite sequence of L,R, front , back is forming a closed path(circle) Design practo (patient slot booking system) Find current running median in stream of integers Find min cost to paint N houses, given Red, Blue, Green costs to paint every houses Given a 2d matrix of 0s & 1s, it can be scaled rotated, find if the 0s are forming shape ‘A’ or ‘B’ or ‘C’ Given a BST where 2 nodes are swapped, swap them back.