Flipkart Interview Experience | Set 40 (For SDE 1)
I was interviewed for Software Development Engineering (SDE1) role Flipkart.
Round 1: Machine Coding round: (90 minutes)
Given a binary tree as a sequence of (parent, child) tuples: (A B)(A C)(B G)(C H)(E F)(B D)(C E) Write a program to find following errors in the tree:
- E1: More than 2 children
- E2: Duplicate Tuples
- E3: Cycle present
- E4: Multiple roots
- E5: Multiple parents
Input is a expression containing parent child relations. output is Error codes or success.
Sample test cases
- Input: (A B)(A C)(B G)(C H)(E F)(B D)(C E) Output: Success
- Input: (A B)(A C)(A D) Output: E1
- Input: (A B)(A B) Output: E2
- Input: (A B)(B C)(C A) Output: E3
- Input: (A B)(C D) Output: E4
- Input: (A B)(B C)(A C) Output: E5
Solution
Code is written in node.js javascript. Tests are using mocha. Major trick in this question is that the data structure need to hold such data is not a binary tree but a graph. Or a graph with two sets of edges children and parents.
I used this DS in javascript to solve:
function Node(data) {
this.data = data;
this.children = [];
this.parents = [];
}
Cycle detection can be done using http://www.
My solution: https://github.com/niklabh/
Round 2: Face to Face
1. Design a load balancer which implements following methods:
- add(n) where n is id of instance
- remove(n) where n is id of instance
- getRandom() which returns a random instance.
All these operation should be of order O(1).
Followup for this question was to change getRandom in such a way that it returns with weighted randomness rather than uniform randomness if weights is associated with instances.
2. You are given a result of cricket tournament with all the wins and losses. Print the teams in such a way that a winning team is always at the right of losing team.
Solution: Store the results as a Directed Acyclic Graph and run topological sort algo.
Round 3: Face to Face
- Explain your projects in detail
- Key metrics about your project i.e. how much load it handled etc.
- If you are storing same data in separate DBs how will you keeping them in sync.
- If you are to write your project from scratch what will you change?
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