September hiring event

Coding #1: Binary search iterator where each node having one child and sibling node. Similar, to this: https://leetcode.com/problems/binary-search-tree-iterator/ but slight variation

Coding #2: Coin denominations: https://leetcode.com/problems/coin-change/
System Design: Facebook News feed

Coding #3: Given the co-ordinates of the triangles on the 2D grid, print the edges. If two triangles share the same edge then print all the boundary edges except shared edge. Sorry don't exactly remember

Coding #4: Similar to subarray sum equals k:https://leetcode.com/problems/subarray-sum-equals-k/ but print the actual subarray