Visual BI Solution - Written Interview Experience.

First Round 20 question.
Time Allocated - 30mins.

Subject included:
Data structures - Stack, Queues, Graph, Complexity, Trees.
C programming - strings.

Graphs include complexity of adjacent list and matrix?
Result of stack after postfix expression for given infix  - 2*3-(4+5).
No. of nodes in tree with depth is given.