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--Lakshay

--Lakshay

“ I had already studied most of algorithms and data structures in my first and second year, but I had become rusty. I needed to revise all of those so I could be confident in the interviews for software internships.
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The level-wise progression of topics, the hints, the solution approaches helped a lot. The game-like design helped me maintain my streak and not be bored. As a result, doing problems on InterviewBit was very interesting.
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--Sachin Kelkar

--Sachin Kelkar

Be able to discuss the big-O complexity of your approaches. Don't forget to brush up on your data structures like lists, arrays, hash tables, hash maps,
stacks, queues, graphs, trees, heaps. Also sorts, searches, and traversals(BFS, DFS). Also review recursion and iterative approaches.

Use the programming language you're best at. It's important to write your solution correctly and in time, so use the language you are most familiar with.

Find and fix the bugs by yourself: Don't wait for the interviewer to find them for you.

Use the hints you are given: Usually, the interviewer knows the question well enough to know which hints will help you next if you get stuck.

Find and fix the bugs by yourself: Don't wait for the interviewer to find them for you.

Use the hints you are given: Usually, the interviewer knows the question well enough to know which hints will help you next if you get stuck.

Min Stack

Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.
push(x) – Push element x onto stack.
pop...

Grid Unique Paths

A robot is located at the top-left corner of an A x B grid (marked ‘Start’ in the diagram below).
The robot can only move either down or right at an...

Combination Sum

Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.
The same repeat...

Permutations

Given a collection of numbers, return all possible permutations.
Example:
[1,2,3] will have the following permutations:
[1,2,3]
[1,3,2]
[2,1,3]
[2,...

Combinations

Given two integers n and k, return all possible combinations of k numbers out of 1 2 3 ... n.
Make sure the combinations are sorted.
To elaborate,
...

Merge Two Sorted Lists II

Given two sorted integer arrays A and B, merge B into A as one sorted array.
Note: You have to modify the array A to contain the merge of A and B. ...

Container With Most Water

Given n non-negative integers a1, a2, ..., an,
where each represents a point at coordinate (i, ai).
'n' vertical lines are drawn such that the two endp...

Valid Number

Validate if a given string is numeric.
Examples:
"0" => true
" 0.1 " => true
"abc" => false
"1 a" => false
"2e10" => true
...

Atoi

Implement atoi to convert a string to an integer.
Example :
Input : "9 2704"
Output : 9
Note: There might be multiple corner cases here. Clarify a...

Number of 1 Bits

Write a function that takes an unsigned integer and returns the number of 1 bits it has.
Example:
The 32-bit integer 11 has binary representation
0...